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Classification of Stars: Spectral Analysis and the H-R Diagram

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Professor Dave Explains

Professor Dave Explains

6 жыл бұрын

So we have made it through the dark ages, and are now a few hundred million years into the lifetime of the universe. There are plenty of stars all over the place, but are they all the same? How can we classify stars? Let's go through the basics of the Harvard System, and then take a look at something called a Hertzsprung-Russell diagram.
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Пікірлер: 241
@marchurtubise4722
@marchurtubise4722 6 жыл бұрын
My man Dave out here making sure I pass every test in class
@jenniekai3851
@jenniekai3851 4 жыл бұрын
Our science teacher played this video in our class and heck it was awesome and really helpful. Thanks proffesor!
@Jacob-zk1jy
@Jacob-zk1jy 4 жыл бұрын
Take english not science. I bet you can guess why.
@jmike2039
@jmike2039 2 жыл бұрын
@@Jacob-zk1jy what the fuck is wrong with you?
@youdononeetokno
@youdononeetokno 2 жыл бұрын
@@Jacob-zk1jy he can take take both
@FrenchLeafA350
@FrenchLeafA350 2 ай бұрын
They’re both mandatory, right?
@Strype13
@Strype13 5 жыл бұрын
Professor Dave is certainly firing gigantic knowledge missiles.
@commtheguy
@commtheguy 3 жыл бұрын
Figures
@dulcx_24
@dulcx_24 4 ай бұрын
YES loll
@0irtgud
@0irtgud 4 жыл бұрын
I'm a 4th year computer science major taking an astronomy class as one of my final electives. My finals tmrw and I'm ready, but Dave really clutch out here. 11/10 content.
@tom2443
@tom2443 Жыл бұрын
I hate to admit this, but I used to think all the stars in the night sky were planets... I didn't know what a "star" actually was. Now thanks to you Dave I know what a star is! (And many more things) Thank you.
@tom2443
@tom2443 Жыл бұрын
@Kate Moore thank you! 😊
@rheiagreenland4714
@rheiagreenland4714 10 ай бұрын
Yeah i used to think jets in the sky were rockets going to space 😂
@anikagrace2215
@anikagrace2215 Ай бұрын
lol, I used to think that every every star was a galaxy (I wasn't even sure what a galaxy was)
@midnighthope7752
@midnighthope7752 3 жыл бұрын
My personal favorite is Only Bad Astronomers Forgot Generally Known Mnemonics
@ProfessorDaveExplains
@ProfessorDaveExplains 3 жыл бұрын
that's a good one
@doppelplusungutmensch1141
@doppelplusungutmensch1141 2 жыл бұрын
I like your intro. You say hello. You say the topic. You start the intro. And that's it! Eight and a half seconds and the topic starts, no gibberish, no ads, no clickbaiting, no silly long intro song, no minutes-long introduction of who you are, and no waiting for what the video is about in the first place.
@Sasquatch1s3r
@Sasquatch1s3r 5 жыл бұрын
Oh Boy An F Grade Kills Me
@aestheticart4955
@aestheticart4955 4 жыл бұрын
Perfect! 😂
@plantsempire
@plantsempire 4 жыл бұрын
O star:Oh! B star:Boy!
@cbarona42
@cbarona42 3 жыл бұрын
Orwell's Book Animal Farm Gives Kids Migraines
@rheiagreenland4714
@rheiagreenland4714 10 ай бұрын
​@@cbarona42bro so frr
@swiftmatic
@swiftmatic 10 ай бұрын
Oh, Be A Fine Girl, Kiss Me.
@needsleep1207
@needsleep1207 4 жыл бұрын
This guy is awesome. If you were just a bit wacky you'd be a modern Bill Nye. Your knowledge and explanations are some of the best i have found. Thank you for your time.
@sahelanthropusbrensis
@sahelanthropusbrensis 4 жыл бұрын
It was always counterintuitive to me that red is cooler than blue.
@DeluxeSlayer
@DeluxeSlayer 3 жыл бұрын
Not really I mean blue is a shorter wavelength which means more energy and more energy = hotter. Besides you can see it when a metal is heated enough ot will go from red all the way to blue.
@sahelanthropusbrensis
@sahelanthropusbrensis 3 жыл бұрын
@@DeluxeSlayer i know the Physics of QED. But, for some reason, when i was a kid, i always thought that red was a hot color.
@DeluxeSlayer
@DeluxeSlayer 3 жыл бұрын
@@sahelanthropusbrensis Oh I get it my bad
@sahelanthropusbrensis
@sahelanthropusbrensis 3 жыл бұрын
@@DeluxeSlayer No problem man👍
@kun_fu_taco4775
@kun_fu_taco4775 2 жыл бұрын
Think about a torch with blue flame vs a lighter with yellow flame. The torch is hottet.
@chubbybunny4570
@chubbybunny4570 3 жыл бұрын
Thank you for explaining this is great detail. My professor was making this very confusing for the whole class
@watcher235711
@watcher235711 21 күн бұрын
This is like watching the Olympics...I just feel honored to share DNA with the amazing scientists who figured this out. Thank you Prof Dave!
@gupdoo3
@gupdoo3 3 жыл бұрын
"feel free to change it depending on your persuasion." [sweats in bisexual]
@tornglory5709
@tornglory5709 3 жыл бұрын
bruhbrhbruhbruhbruhbrurbhrburbhrburbhrbuhsyw hbyu5e8p9 yha 4s3890
@FuriousMaximum
@FuriousMaximum 3 жыл бұрын
PFFFFFFFFFFFFT
@gwgaming8301
@gwgaming8301 5 ай бұрын
i love getting baked AF and learning the secrets of the universe
@micnorton9487
@micnorton9487 5 күн бұрын
👍🚬 just don't go Terrence Howard on us lol...
@whome5933
@whome5933 5 жыл бұрын
I love the content and the simplistic explanations you provide. Thank you. 👍
@triciamaeguerrero172
@triciamaeguerrero172 4 жыл бұрын
Thank you so much for this video Professor Dave!!! You really helped me understand H-R Diagram in the simplest way as possible. I'm so thankful that I discovered you. I'm looking forward to watch your other videos especially the classes are now online because of the pandemic. I really need a study buddy to help me understand more the lesson. Again, thank you so much!! If I turn 18 years old and have a credit card, I'll make sure to join your channel. That's the best way to thank you for all the help. More vids and stay safe!!! xoxo
@tructruc4369
@tructruc4369 Жыл бұрын
Very helpful! Today I'm so glad that I figure out such a wonderful channel like this
@dulcx_24
@dulcx_24 4 ай бұрын
Love this series 👍❤
@givenflame1008
@givenflame1008 2 жыл бұрын
Thanks Jesús, now I know more about Star clasification
@harold_Shitmum
@harold_Shitmum 4 жыл бұрын
Nice one Dave.
@afriendofafriend5766
@afriendofafriend5766 4 жыл бұрын
When you said red giants were cool but luminous, I thought you meant cool as in interesting.
@CoxDannyJ
@CoxDannyJ Жыл бұрын
3:20 is this the same kind of thing that we see with fire? Like how a blue flame is hotter than a red flame?
@-Tofu.-
@-Tofu.- 2 жыл бұрын
I’m not here because I have tests, quite the opposite really, I’m on my summer break. I was just scrolling through KZfaq and your channel. I’m hooked! It’s very interesting, I’m feel so smart now 😂.
@Snomrade
@Snomrade 2 жыл бұрын
This is helping me satisfy my current hyper fixation which is learning as much as I can about stars
@CheddaWhizzy
@CheddaWhizzy Жыл бұрын
I'm guessing this is how they detect atmospheric temperature on exoplanets? right? Through their spectra, that is. I know this video is about stars but can this be applied to exoplanets as well? Thanks for a response.
@BabySagan
@BabySagan 2 ай бұрын
Excellent vids Professor. Thanks for all the sweet star bits!
@AvroBellow
@AvroBellow 3 жыл бұрын
Main Sequence Stars: Spectral Class O -> Indigo/Violet * Spectral Class B -> Blue * Spectral Class A -> Green * Spectral Class F -> White * Spectral Class G -> Yellow Spectral Class K -> Orange † -> Ideal star type for life as we know it. Spectral Class M -> Red † * - These stars are always large enough to result in supernovae. † - These stars are never large enough to result in supernovae.
@carultch
@carultch 2 жыл бұрын
Is there a particular reason why stars have that particular letter sequence to classify them?
@Sundansulaku2023
@Sundansulaku2023 2 жыл бұрын
a is white and f is yellow white sun is g type
@ParaSpite
@ParaSpite 2 жыл бұрын
Large stars are inefficient and burn fuel too quickly. They have to be disassembled until the remains are small stars or inert hydrogen storage objects. That way, life around the star can be maintained for far longer.
@ahmedsenussi8232
@ahmedsenussi8232 4 жыл бұрын
Thanx for helping me to understand just that little bit better you make this subject fun aswell
@anthonywilliams8956
@anthonywilliams8956 Жыл бұрын
Great video! You explained very well and the graphs were an added bonus!
@maskim3
@maskim3 5 жыл бұрын
Thanks for that precious video man !
@Capin_KO
@Capin_KO 4 жыл бұрын
You know what, I'ma subscribe! Why not!
@amlanbiswas4024
@amlanbiswas4024 5 жыл бұрын
professor can u make a video about Red Giant stars...i am eagerly waiting
@ProfessorDaveExplains
@ProfessorDaveExplains 5 жыл бұрын
buddy that's covered in this tutorial.
@FeedYourBrainChannel
@FeedYourBrainChannel 2 жыл бұрын
“Hey it’s professor dave. Let’s check out some stars” I swear his intros are insane out of context
@abhyuday1294
@abhyuday1294 6 жыл бұрын
But i dont understood that why there are varaities of stars? Please tell me the reason behind it ??
@iffatsid8998
@iffatsid8998 5 жыл бұрын
This is what I needed
@rporta
@rporta 2 жыл бұрын
great series, easy to understand and informative
@neshil
@neshil 3 жыл бұрын
Thank you so much ❤️❤️
@djchemtalk2946
@djchemtalk2946 4 жыл бұрын
Super info... thx prof
@googlebarbaralernerspectre2581
@googlebarbaralernerspectre2581 5 жыл бұрын
K type stars are my favourite. Followed by white dwarves. Hopefully we can save the stars :)
@AbhishekSingh-hu4ky
@AbhishekSingh-hu4ky 5 жыл бұрын
Good work
@argentinosaurus0096
@argentinosaurus0096 4 жыл бұрын
Did you Know: Relationship between Colors of the Star and Color of angry birds characters: O type = The blues B type = Luca A type = Matilda F type = Poppy G type = Chuck K type = Bubbles M type = Red
@ethankjt7277
@ethankjt7277 3 жыл бұрын
It's very true
@Mike_Toreno
@Mike_Toreno 3 жыл бұрын
Asians when they realise that B class shines more than A class: My life is a lie
@loveitftw
@loveitftw 3 жыл бұрын
💀
@bibekluitel6113
@bibekluitel6113 5 жыл бұрын
Professor could you please explain me about the AGB stars and its types?
@lydiat.2038
@lydiat.2038 2 жыл бұрын
I am living for the intro
@Emcee_Squared
@Emcee_Squared 6 жыл бұрын
Another great vid!
@belgiumball2308
@belgiumball2308 4 жыл бұрын
You saved my face because i had an astronomy exam
@bens.5127
@bens.5127 5 жыл бұрын
Anyone who would thumbs down such a great video must really live a miserable ignorant life. 😋🧐
@jonathanmcastardo4282
@jonathanmcastardo4282 3 жыл бұрын
Thanks professor i answer my exam because of you thaaaaannnnnkkkksssss
@albireo2990
@albireo2990 2 жыл бұрын
Some of the coldest red dwarfs are not even M type, but rather L type, which is usually a classification used for brown dwarfs. These L-Type red dwarfs are around 2,500-3,200K. They are also very small and very loosely held together. They are barely even stars at all, and are around 0.08-0.22 Solar Masses.
@timthefinner
@timthefinner 6 жыл бұрын
Looking forward to your explanation to dying stars
@timthefinner
@timthefinner 6 жыл бұрын
Awesome series as always :)
@Papa-ee8yr
@Papa-ee8yr Жыл бұрын
❤ wonderful explanation
@rameshmantha1015
@rameshmantha1015 4 жыл бұрын
awesome narration
@kalpanasharma4249
@kalpanasharma4249 5 жыл бұрын
thank u soo much
@ethankjt7277
@ethankjt7277 3 жыл бұрын
Yea g type is my favourite. Yellow is my favourite colour. But orange stars are shown to be the best stars for habitability if we ever relocate
@JohnDerhammer
@JohnDerhammer 2 күн бұрын
Unfortunately, Type N and Type S spectral Types have been neglected. So much for celestial classification. Next thing you know, they'll classify the Milky Way Galaxy as a spiral galaxy instead of the barred galaxy that it is.
@knowledgegravity6904
@knowledgegravity6904 3 жыл бұрын
Tq tq tq tq tq tq tq tq tq tq very much sir it helped lot for my exam
@korkutalekberov7116
@korkutalekberov7116 4 жыл бұрын
What about T 8 type star They are the coolest stars
@bartonpaullevenson3427
@bartonpaullevenson3427 3 жыл бұрын
Absorption spectra, not emission spectra.
@DesertoftheReal-sl-1134
@DesertoftheReal-sl-1134 4 жыл бұрын
Omniscient beings are firing gigantic knowledge missiles!
@brianb8060
@brianb8060 4 жыл бұрын
Yep. That's easy to remember.🙄
@IIGrayfoxII
@IIGrayfoxII 4 жыл бұрын
Sad that you didnt mention L and T class stars.
@bartonpaullevenson3427
@bartonpaullevenson3427 4 жыл бұрын
Don't they (along with class Y) apply mostly to brown dwarfs?
@Sundansulaku2023
@Sundansulaku2023 2 жыл бұрын
@@bartonpaullevenson3427 L0V toc L2V is still a star
@bartonpaullevenson3427
@bartonpaullevenson3427 2 жыл бұрын
@@Sundansulaku2023 You're right. The criterion is at least 0.075 solar masses to initiate fusion in the core, and 0.075 Solar masses is about the average mass of a type L2V star (we think--unfortunately there's still a very small database of measured masses at this end of the scale).
@andreagalang119
@andreagalang119 4 жыл бұрын
@Jay Galang
@ReachSkyla
@ReachSkyla 4 жыл бұрын
Annie jump cannon is a badass name
@FreeWay1066
@FreeWay1066 Жыл бұрын
1:47 this is how I remember star classes, like for elite dangerous
@Jasynatics
@Jasynatics 3 жыл бұрын
Im a political science student and its common sense that this does have nothing to do with my course but just finished modern physics playlist and here i am relearning how the universe is formed. Feels like im back in junior high, its just that i feel like i understand it better than before.
@urworstnightmare.4530
@urworstnightmare.4530 4 жыл бұрын
Does it mean that the blue part of the fire is hotter ?
@Ignisan_66
@Ignisan_66 4 жыл бұрын
Yes.
@robinchesterfield42
@robinchesterfield42 3 жыл бұрын
My favourite mnemonic (including the brown dwarves): "Oh Boy, A Feral Giraffe Killed My Little Transparent Yeti" (with thanks to Crash Course astronomy. ;)
@darkseraph2009
@darkseraph2009 Жыл бұрын
As an Elite Dangerous player, I don't necessarily need to remember the order of the main sequence, just each letter. So I often use the mnemonic KGB FOAM.
@viriamiri
@viriamiri 9 ай бұрын
ENA PFP!!!!!
@user-abd_almer313
@user-abd_almer313 Жыл бұрын
الهيدروستاتيكي ( حالة التوازن ) : السديم لديه قوة تجعله يتمدد وقوة تجذبه فيتقلص واذا بقت هذه القوة متماثلة فان السديم لن يختفي . كتلة الجينز : هي كتلة اكبر ببضع آلاف من شمسنا ، والجاذبية تنتصر عليها . عند حدوث اندماج نووي يؤدي إلى تكون حرارة وبالتالي تكون النجم . النجوم انواع : اصفر E-L ازرق A-D احمر M احمر غامق N 3,500k______________________________25,000k M - K - G - F - A - B - O كلما زادت حرارة النجم انفصل الكترون النواة عنها مما يشكل الحالة الرابعة البلازما . O : ازرق قوي ، B : ازرق ضعيف او سمائي ، A : رصاصي ، F : اصفر ضعيف ، G : اصفر قوي , K : احمر ضعيف , M : احمر قوي . يمكنك الرجوع إلى دقيقة - 3:15 . حلقة 4 . الاجسام الاكثر سخونة زرقاء والاقل سخونة حمراء . اذا اردت ابحث عن مخطط HR . الأصفر القوي هو الشمس او Sun .
@user-kv6fe1rf5d
@user-kv6fe1rf5d Ай бұрын
I dont understand half of what you said what thousands gravity triumphing means I don't know um
@user-abd_almer313
@user-abd_almer313 Ай бұрын
@@user-kv6fe1rf5d Sorry about that but you'll have to watch the clip and do the summarizing yourself; I guarantee you that you will not be able to advance knowledge if you depend on others. Watch the full clip and write a summary for yourself, to become more empowered.
@raheemabdul1066
@raheemabdul1066 4 жыл бұрын
0:09 a billion years into the history of the universe would be a billion yers ago isn't it? so about 12.6 billion or 1 billion years old?
@MrMichealHouse
@MrMichealHouse 4 жыл бұрын
What? He's saying following the timeline from the previous video, we're around a billion years in since The Big Bang.That's it. He's not saying now, today, he means since where we left off in the previous video.
@zakiranderson722
@zakiranderson722 4 жыл бұрын
Only Bad Astrophysicist Feel Good Knowing Mnemonics.
@cbnewham5633
@cbnewham5633 4 жыл бұрын
I can't believe anyone who is sane would find that mnemonic "sexist".
@kayleelomas5598
@kayleelomas5598 3 жыл бұрын
A little rude maybe if you stretch it, but sexist? No way.
@amlanadarshdas4470
@amlanadarshdas4470 3 жыл бұрын
It isn't
@fredodokonyero1044
@fredodokonyero1044 5 жыл бұрын
so elaborate
@whatarewedoing0
@whatarewedoing0 5 ай бұрын
why does the temp scale go down left to right? is that the norm, why? lol
@curiousaboutphysics8605
@curiousaboutphysics8605 6 жыл бұрын
Cool ! How do you create such videos???
@ProfessorDaveExplains
@ProfessorDaveExplains 6 жыл бұрын
adobe after effects!
@curiousaboutphysics8605
@curiousaboutphysics8605 6 жыл бұрын
Professor Dave Explains oh! thanks for replying.
@curiousaboutphysics8605
@curiousaboutphysics8605 6 жыл бұрын
And what about the intro???
@rigel533
@rigel533 3 жыл бұрын
My type is B
@somebluestaroutinspace5625
@somebluestaroutinspace5625 2 жыл бұрын
Hey Rigel, it's been a few million years how are your fourteen planets doing?
@lumpyspaceprincess6335
@lumpyspaceprincess6335 7 ай бұрын
Is this for high school or coullage (I don't know anything about US' circulum)
@rheiagreenland4714
@rheiagreenland4714 7 ай бұрын
high school astronomy
@binbingman
@binbingman Жыл бұрын
The sun isnt white it is infact yellow due to its classification on temperature and absolute magnitude (brightness when it is at 10 parsecs away) . In main sequence star area it is classification G with its temperature being roughly 5000k and absolute magnitude of 6 , basic astrophysics .
@rheiagreenland4714
@rheiagreenland4714 10 ай бұрын
"Yellow dwarf" is just a misnomer G-stars are in fact white in visible light. They actually peak in green by the way. The sun only appears yellow in filtered images or due to atmospheric scattering of blue light. They are often associated with yellow to differentiate them from A and F type stars as well as white dwarfs
@titaniummechsx3324
@titaniummechsx3324 22 күн бұрын
If it’s yellow then when you use a prism you would only get yellow, but we get a rainbow, meaning it got white light
@ShouttoJesusChrist
@ShouttoJesusChrist 4 жыл бұрын
Good morning everyone.
@wolfstar3883
@wolfstar3883 4 жыл бұрын
Good Mythical Morning!
@jaimecampos9188
@jaimecampos9188 2 жыл бұрын
Such a cool video. Nicely explained! Thank you very much :)
@plutoidrepublic2765
@plutoidrepublic2765 2 жыл бұрын
as a 16 year old who plans to be a astrophysisct and am 2 years from graduating high school, i already know this stuff, but is there even MORE to know?
@somebluestaroutinspace5625
@somebluestaroutinspace5625 2 жыл бұрын
We stars have many things about us that have yet to be discovered. And the universe itself has many secrets it has yet to give up with space there's always something to find or discover.
@vennstudios9885
@vennstudios9885 4 жыл бұрын
Is Dave a grade school teacher or university teacher
@backstreetfan2887
@backstreetfan2887 3 жыл бұрын
he used to teach organic chemistry at a college
@cbrtdgh4210
@cbrtdgh4210 2 жыл бұрын
This topic finally makes sense. It is so poorly explained in textbooks.
@Turi6070
@Turi6070 6 ай бұрын
1:36 OBAma Funny Guy, Kills Me with jokes
@jordangaming7974
@jordangaming7974 2 жыл бұрын
I have another way to memorize the order Oh boy,a fricking gorilla kissing me
@Onio_Saiyan
@Onio_Saiyan 4 жыл бұрын
How I remember scoopable stars in Elite Dangerous: Always Be FuelinG Or Kill Myself. It's not good for the temperature model though.
@brianb8060
@brianb8060 4 жыл бұрын
Growing up at the end of the cold war, I use KGB FOAM.
@xr-nm4nb
@xr-nm4nb 4 жыл бұрын
Dave be out here learning us on shit
@ANODOMI
@ANODOMI 2 жыл бұрын
One slight mistake, O Type Stars Are 30000k, B Stars Are 25000K.
@w0lf667
@w0lf667 4 жыл бұрын
So are violate/purple stars are possible...?
@rexisnox577
@rexisnox577 3 жыл бұрын
Kinda but you would have to have super human vision to tell that they are.
@user-kv6fe1rf5d
@user-kv6fe1rf5d Ай бұрын
These are called wolf ray stars they are more bright then the brightest stars
@nugnugnugget8717
@nugnugnugget8717 3 жыл бұрын
Hi Dave
@canbest7668
@canbest7668 3 жыл бұрын
I was talking to Dave. He says hi
@paradis_4205
@paradis_4205 4 жыл бұрын
No images? Just sound....
@TheInfiniteOrbital
@TheInfiniteOrbital Жыл бұрын
The K type star is not red, it's orange.
@rashidisw
@rashidisw 4 жыл бұрын
4:13 Yeah Sun is yellow, but they insist that Sun is white...
@HugoFilho.
@HugoFilho. 2 жыл бұрын
The sun is white These classifications are old and wrong
@angelarturokooistra7671
@angelarturokooistra7671 2 жыл бұрын
Mutant kittens go for a brake outside
@alanlalonde6506
@alanlalonde6506 Жыл бұрын
OBAFGKM = orange 🍊, banana 🍌, apple 🍎, Fruit, grape 🍇, kiwi 🥝, mango 🥭
@forestgiliad3504
@forestgiliad3504 3 жыл бұрын
why Dave do be looking like if Penguinz0 majored in astronomy
@argentinosaurus0096
@argentinosaurus0096 4 жыл бұрын
Oh Be A Fine Girl Kiss Me. I was kissed by Winx Club.
@carultch
@carultch 2 жыл бұрын
Or: Oh boy, Alex Filippenko gives killer midterms.
@PsycoMyco6990
@PsycoMyco6990 3 жыл бұрын
This is a red cool video
@stromghouls
@stromghouls 4 жыл бұрын
betelgeuse and antares are not red giant stars, but red supergiants.
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