2. For main sequence stars, the more massive stars are more luminous. Luminosity

Question

2. For main sequence stars, the more massive stars are more luminous. Luminosity (see right axis of HR Diagram) can be thought of as the rate at which stars burn up the fuel available to them. GX Andromeda is a M2 main sequence star with an absolute magnitude M-10. Achernar is a B3 main sequence star with an absolute magnitude M--3. (a) Which star is least massive? -10 Supergants 104 (b) Which star is least luminous? Giarts Main Sequence 1.0 ? (c) About how many times more luminous is Achernar than our Sun? 10Whte Dvart 0.01 Hertzsprung-Russell Diogram M Spectral Cless 8,000 Temp (K) 25,00010,000 5,000 (d) Which star converts more Hydrogen to Helium every second?

Explanation / Answer

a) Ans: The massiveness of a star is directly proportional to its brightness and hotness. Therefore, least bright and least hot stars are least massive. So, White Dwarfs are least massive stars.  

b) Ans: White Dwarfs is the least luminous star. Its position lies in the lower left corner of Hertzsprung–Russell diagram.

c) Ans: More massive stars consumes hydrogen to helium at faster rate. Therefore, super giant stars converts more hydroen to helium

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