Exam 16: Basic Properties of Stars

The star Capella has an apparent magnitude of 0 and is the same color as the Sun.Its distance is 14 parsecs.Which of the following describes its similarities with the Sun?

The hottest stars have spectral class

An H-R diagram can be made by plotting

A solar-type star is observed with an apparent magnitude of 12.7.How far away is it? Recall that the absolute magnitude of the Sun is 4.7.

Which of the following can produce a continuous spectrum?

Why are the Balmer lines of hydrogen weak in stars that are hotter than about 10,000 K?

When an atom loses one or more electrons it is said to be

The nearest known star is at a distance of about

Two stars have the same color,but differ by 5 magnitudes in absolute magnitude. What stellar property must be different in the two objects?

The distance to a star is known if we know its

Suppose we observe a hot,tenuous gas against a dark background.What kind of spectrum will we see?

The stars located in the lower left corner of the H-R diagram are

Consider two stars X and Y with surface temperatures of 3000 K and 10,000 K respectively.Which of the following is true?

Most of the stars in a typical H-R diagram fall on the

A star with a trigonometric parallax of .02 arcseconds has a distance of

By what factor would the brightness of a star increase if an observer moved from 5 parsecs to 1 parsec from the star?

Which of the following produces an emission line spectrum?

A measurement of the parallax of a star allows us to determine the star's

Why are there more main sequence stars than giant stars?

Suppose the electron in an atom is in an excited orbit.What will happen to the electron if nothing disturbs the atom?