Exam 11: Measuring the Stars: Giants, Dwarfs, and the Main Sequence

If a star has a parallax of 0.25", then its distance is about 13 light- years.

Our nearest stellar neighbor is a little less than 1 parsec away.

If a star has a parallax of .005", then its distance is light- years.

Contrasting a M3Ib and M3V star, they differ primarily in and _ .

On the H- R diagram, red supergiants like Betelgeuse lie

Almost all properties of other stars are described relative to our Sun.

Which statement about stellar motion is incorrect?

To get the space velocity of a star in three dimensions, you need its proper motion, distance, and radial velocity.

Two stars have the same absolute magnitude, but one lies twice as far from Earth as the other. It will appear half as bright.

At spectral type B1, Spica is about three times hotter than the Sun, so every square cm. of Spica must give off times more energy than our Sun does.

The apparent magnitude of the Sun is - 26, while Sirius has an apparent magnitude of - 1. How much brighter does the Sun appear than Sirius?

How can a white dwarf be hotter than our Sun, yet much less luminous?

A star near the lower right of the H- R diagram is likely to be

Compared to a type A0 star, a type A9 star is