Exam 8: The Family of Stars

How can we find the distance to a star that is too distant to have a measurable parallax

Table 8-2 -Which star in Table 8-2 has the greatest surface temperature

The Lyman series lines of hydrogen all lie in the infrared.

Barnard's star is 5.9 ly from Earth. Its parallax angle is 0.55". Note 1 pc is 3.26 ly and 1 ly is 63200 AU.

The spectra of the coolest stars contain strong absorption features (or lines) of

The most massive main-sequence stars are the ________ spectral class and the ________ luminosity class.

Which graphs of line strength and temperature would give the most precise value of the star's surface temperature

A parsec is I. a unit of length used in astronomy II. 2.06 × 105 AU III. the distance to an imaginary star whose stellar parallax is one arc second IV. 3.26 light years V. the longest unit of length in astronomy

Table 8-2 -Which star in Table 8-2 is the closest to Earth

How does the luminosity depend on temperature for stars of the same size

The correct sequence of spectral type letters from hot on the left to cool on the right is

If we can solve the orbital motion of an eclipsing binary, we can find

The parallax angle of the Sun is 1 arc second.

A spectroscopic binary shows periodic variations in its

How does absolute visual magnitude tell us the intrinsic brightness of a star

The ________ of a star is a measure of the total energy radiated by the star in one second.

The mass-luminosity relation applies to both white dwarfs and main-sequence stars as both trace linear lines on the H-R diagram.

Which of the following kind of stars is most dense

An M star is hotter than an O star.

The mass of a visual binary pair of stars can be obtained from