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

The pressure in the photosphere affects the width of spectral lines.

Where do the majority of naked- eye stars fall on the H- R diagram? Is this true of the majority of stars close to our Sun as well?

The star's color index is a quick way of determining its

On the H- R diagram, the bright blue stars that dominate the naked- eye sky lie

Where on the H- R diagram are the majority of stars that dominate the night sky?

If two stars have the same parallax, but the brighter is magnitude +2.3, and the fainter is magnitude +3.3, then the fainter star is less luminous.

A star has a parallax of .05". Its distance is

Our Sun lies about the middle of the main sequence and the H- R diagram.

What can be said with certainty about a red star and a blue star?

Must we see both spectral lines splitting to find a spectroscopic binary?

If spectroscopic luminosity classification gives us an estimated distance to the faint star SAO 47552 of about 3300 light- years, then its parallax would be only

What physical property of a star does the spectral type measure?

A star is 10 parsecs from Earth. Which statement is true?

The Sun, at absolute magnitude +4.8, would be one of the brightest stars in the sky if seen from 32 light- years distance.

The parallactic angle is the total shift observed over a six- month interval.

Most naked- eye stars would fall to the top left on the H- R diagram.

How is proper motion measured?

Arcturus, the brightest star of spring skies, is spectral type K, so to us it appears in color.

Spectroscopic parallax is more accurate than trigonometric parallax for nearby stars.

The vast majority of stars near us would fall to the bottom right on the H- R diagram.