The Cosmic Perspective (9th Edition)
The Cosmic Perspective (9th Edition)
9th Edition
ISBN: 9780134874364
Author: Jeffrey O. Bennett, Megan O. Donahue, Nicholas Schneider, Mark Voit
Publisher: PEARSON
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Chapter 15, Problem 58EAP
To determine

To Calculate: The stellar radii of the Sirius A.

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Calculate the main-sequence lifetimes of (a) a 4 ?⨀ star, and (b) a 0.75 ?⨀ star. Express the lifetimes of these stars as multiples of the Sun’s lifetime (?⨀ =1010 years), as well as in units of years.
A star has a surface temperature of T = 10,000 K and a radius three times that of the Sun, R = 3R (recall that symbolizes the Sun). What is its luminosity, L, in units of solar luminosities, L ? Give your answer to three significant figures. answer, expressed in solar luminosities, tells how many times more luminous this star is than the Sun.
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