Expert: Jayendra Upadhye - 11/20/2008

Question
Hi Jayendra, you had just previously answered my question but it didnt come to my email so I am unable to rate your answer. Thank you for answering my ques.

I have another question to ask, which of this belong in the catagories of, WHite Dwarf, Main sequence stars and Red Giant/Super giant.

*Very cool but very luminous
*Not much larger n radius than earth
*Found in the upper right of the H-R diagram
*The majority of starts in our galaxy
*The sun for example
*A very hot and very luminous star
*Very hot but very dim

Which belongs in those catogories?

-ALSO-
Which of these belongs in the Catogories of: White Dwarfs, Black Hole, Neutron Star.

*Sometimes appear as a pulsar
*In a binary system, it can explode as a supernova
*Size defined by it's Schwarzschild radius.
*Supported by electron degeneracy pressure
*Typically about the size (diameter) of earth
*Has a mass no matter than 1.4 M Sun
*Viewed from afar, time stops at it's event horizon
*Usually has a very strong magnetic field.

Thanks I really appreciate your answers.

Answer
Hi Justo,
This is what leads me to believe that some one somewhere on this site is "loading the dice".
Ever since my score has overtaken most experts, my answers have suddenly started to appear as unread, scores dont appear even if the questioner has marked the score.
I come to know only in their second questions that they had in fact rated me!
My ratings were refreshed only after a wrote a letter to the "powers that be" last time, and it was like 3 nominations for expert of the week/month or some thing, all 10s!!
Wonder what it is this time, time for another letter to the editor!

Coming to your question..
1 - white dwarfs
*Not much larger n radius than earth
*Very hot but very dim (white hot).

2 - main sequence
*The majority of starts in our galaxy
*The sun for example

3 - Red Giant
*Very cool but very luminous (Betelguese at 800 deg c)
*Found in the upper right of the H-R diagram
*A very hot and very luminous star (Rigel blue giant 10-15000 deg)


second group

1 - white dwarf
*In a binary system, it can explode as a supernova
*Size defined by it's Schwarzschild radius.
*Supported by electron degeneracy pressure.
*Has a mass no matter than 1.4 M Sun

2 - Black Hole
*Size defined by it's Schwarzschild radius.
*Viewed from afar, time stops at it's event horizon.

3 - Neutron Star
*Sometimes appear as a pulsar
*Usually has a very strong magnetic field.


regards
Jayen