HR (Hertzsprung Russell) Diagram - how stars are classified based on magnitude & temperature

[@cardbro7]

Super helpful! I like how you explained every little part of the diagram.

[@Em-ey9rr]

For any users wondering if this is useful: It definitely is! This is an in-depth explanation of how the H-R diagram works, and how to read and plot stars on it. Google will not give such good results, so keep watching. This is very, very detailed and correct! This was extremely useful for my astronomy event in Science Olympiad. I hope you found this useful

[@nikhiljain3351]

Im in SciOly too. (Div B tho)

[@Em-ey9rr]

NikhilDegrasseTyson Cool! Me too.

[@adamlinos1043]

15:44 90% of stars lie on the main sequence not 95% (9% are white dwarfs and 1% red giants)

[@fridaalvarez3101]

I started studying physics by myself and this was really helpful! Thanks!! I will continue watching your videos :))

[@PhysicsHigh]

Thanks and please share 🤓

[@manuelcastaneda1888]

Self taught

[@수학짜쭌]

hi i am from far east...south korea ..same location like japan, china .. thank you for your cool video

[@igorgerlovin3185]

beetle-goose

[@peachesrambo4037]

The sun is white

[@PhysicsHigh]

That is true though it’s labels as a yellow G2 star. My next video will explain star colour.

[@alyzerine1]

Excellent HR description of spectrum (k) luminosity and size. What I would like to know also is the absolute brightness of a star apart from its size, say, specifically the surface luminosity. And why are some stars’ surface luminosity so much brighter than a main sequence sun.

[@leonezapandagani7267]

Thank you so much for giving me a very comprehensive explanation.

[@blueties1]

It would probably help to add that stars on the main sequence are stars leading their ordinary lives by fusing hydrogen to helium. A star leaves the main sequence when the ordinary H to He reaction is running out, and these stars are in the process of dying or are already dead, when fusion reactions have ceased (as in white dwarfs).

[@bigslimdogg6697]

Hi you probably watching this because of school aren't you?

[@ashleyhe3719]

who is learning about this in sixth grade

[@enmajoanrojasvargas7640]

Thank you for this content! It helps a lot. Greetings from Chile 👋🏻

[@PhysicsHigh]

You’re welcome

[@HighOverlordSnarffieBeagle]

I tried to see the Southern Cross but the Earth kept getting in the way.

[@curious5296]

I was stuck in this diagram but after watching thing everything is cleared☺️

[@PhysicsHigh]

Glad it helped

[@physicsboi1744]

@@PhysicsHigh My teacher sent me here and it is so helpful!

[@roonilwazlib8137]

great effort, and really well made!!! loved the explanation of HR diagrams

[@valeriadelgado3696]

I loved this video and was educational and easy to understand. I do have a suggestion. It would be useful to have the pointer (mouse) white or yellow and maybe bigger so we can follow along when you point. I couldn't see it very well. Other than that, it was great.

[@fernandoramos4636]

Very good Sir! My name is Fernando

[@PhysicsHigh]

Thanks. My name is Paul 😉

[@rileybeckham2104]

I’m an American listener!!!!

[@sartaj_s8604]

did i ask lol gay

[@rileybeckham2104]

Sartaj Sandhu why are you being mean

[@theodoresweger4948]

Thanks very well explaned nothing left out!

[@Okaybudde]

The was very helpful, thank you very much.

[@arunmoses2197]

Thanks for getting me high on physics!

[@PhysicsHigh]

Glad I could help 😉

[@arunmoses2197]

@@PhysicsHigh My comment was kind of a joke but yeah it was a helpful video.

[@Sighsayshi]

This video just saved me 😭 Summer school is killin me 💀

[@Sidhuz516]

Can u plzz explain completely the birth of a star in separate video

[@hannahhall2729]

Suuuuuper helpful! Thanks so much for this!

[@gracenovely9463]

apakah ada link untuk simulasinya?

[@deanomni7309]

I love your accent so much

[@muhammadamrullah2147]

A levels exam in 2 weeks and oh boy can this be any more useful.

[@Nypriot]

how did it go ?

[@hashtagharris7126]

Well explained

[@hrperformance]

very well explained. thanks very much

[@PhysicsHigh]

You’re welcome

[@kavyasharma7229]

Sir.... what is stellar evaluation??

[@PhysicsHigh]

I think I said stellar evolution

[@kavyasharma7229]

@@PhysicsHigh sir is stellar evolution related to study of stars??

[@PhysicsHigh]

Absolutely. By understanding how they work and their properties, we can understand how they involve.

[@kavyasharma7229]

@@PhysicsHigh sir is there any book from where can study briefly about stellar evaluation.....?? And sir stellar evaluation and evaluation of stars are same??

[@PhysicsHigh]

You mean evolution I assume. Yes they are the same. Don’t have a specific book in mind but most introductory astrophysics books will cover star evolution.

[@keontan4824]

Very helpful!

[@mikiteasdale]

I found this to be very helpful for my Stellar Astronomy class! Thank you!

[@shrirangsapate]

This Video was helpful for me but Can you make more detail version of this like how to calculate luminosity, brightness and temperature. I also wanted to ask is the spectral line used to detect temperature or class of stars?

[@PhysicsHigh]

Good topics and at some stage will have videos on them. Classes are just that; classification. Temperature is determined by spectral lines but also examining black body curve and Wiens Law.

[@BlazeOfGlory77]

Very informative and beautifully explained. Thank you Paul.

[@mahdimahtab296]

Best!!! That was great!

[@PhysicsHigh]

Thanks

[@chrisraccoon1726]

I'd love to hear about Graham's number by your voice With token of esteem,

[@PhysicsHigh]

Thank you, though Graham's number is more mathematics than physics

[@katkraljevski6569]

I have my physics HSC tomorrow and I want to set myself on fire but I just want to say your content is very good and I wish I watched it all 12 months ago.

[@PhysicsHigh]

Thanks. Good luck tomorrow

[@katkraljevski6569]

@@PhysicsHighThank you (I will need it!)

[@birminghamb1ues]

Perfect for my students (age 15) studying for GCSE Physics.

[@diyaprajapati3257]

It was very amazing video but I want to know that between O to F or F to M how many numbers lie like O1, O2,G2 and many more.

[@harryfaure3456]

0-9

[@PhysicsHigh]

Oops my bad. Correct.

[@krzysztofpickering7236]

So easy to understand, thank a lot!

[@8dholland]

Finally. A good explaination.

[@pranjitnath7]

Thankyou sir ! From Assam India

[@rochakgyan1229]

This made me very sad and upset😐😐😐😐

[@danil5494]

why?

[@lilpp1]

High School Physics you say...I'm in University and this was super helpful for an Arts major taking a Physics elective!

[@kaylaharris7181]

thank you!

[@bwilkins1566]

Very good job explaining it

[@r.m.8128]

Really good explanation

[@asparagusarrugala7663]

bilie eillesh succ

[@ivyrainbitch]

Jimmy Finch what?

[@yes-yh2er]

thank you.

[@suprajasowrirajan930]

Extremely helpful ! Thanks a lot

[@cyrrender]

thank you so much!!

[@klassydee9900]

Thanks for the great video. Your have explained this diagram clearly and very well.

[@ImCaveJohnson]

How do i know the number of the star such as a B8 or m2? Whats the number for?

[@PhysicsHigh]

The numbers refer to the subclassification of the spectral class and the higher the number then the cooler the star. SO for example an B3 star is hotter than a B8 star, which is obviously hotter than a A2 star. Hope that makes sense

[@ImCaveJohnson]

Yes thank you! I was assuming it had to do with how bright it is. That makes a whole lot more sense.

[@shuhlinspinnuh6600]

I am very sad

[@greekmotivation589]

what is this mathematical formula that determines the size of the stars?

[@arshiyaghj811]

(L^(1/2))/((T/Tsun)^2)

[@arshiyaghj811]

this formula shows radius

[@yahliezaguri-gal1564]

my teacher made me watch it even though I am in 6th grade

[@falahzainab2633]

ThaNks

[@anonymous-pl5gq]

hi thanks for the video! i was just wondering how was this all created? How did Ejnar Hertprung and Henry Norris Russell create HR diagram?

[@PhysicsHigh]

longer story really but both did the graph worked out the graph independently whilst trying to classify stares in the early part of the 20th century

[@alexlang178]

Great explanations! Thank u!

[@bg.wrld.studio398]

Great video , it helped me study for my upcoming school year. Could not hank you enough.

[@PhysicsHigh]

Thanks. good luck.

[@Chenoah.]

Thank you!

[@sababatamanna2117]

Thank you!

[@vishalgmr3499]

I thing it is better to tell slowly with deep explanation

[@asparagusarrugala7663]

poopoo

[@briwwwww]

There’s 0 point in this. i’m not gonna use this in the future. 😔😐

[@Oxygenationatom]

shush then why click on the video

[@wowaperson9395]

I was forced to skip the ad : (

[@will2see]

not magnitude, but absolute magnitude.