2 Flashcards
1
Q
how doppler shift in spectral lines is measured?
A
comparison of spectral lines with known lines of the element gives shift in spectra. which is based on radial velocity
2
Q
what are spectral lines?
A
3
Q
what is meant by Double-lines appear in spectrum?
A
spectra is composite of both components of the binary.
4
Q
how to know if single line spectroscopic is binary?
A
shift in line
4
Q
how can radial velocity be calc by doppler shift?
A
v_rad / c = del lmabda /lambda_obs
5
Q
how was first binary observed?
A
shift in double line spectroscopic binary
6
Q
calculating observables?
A
bolometric mag, eff temp, L,R—
how?
7
Q
lines of each spectral type?
A
8
Q
what equations describe stellar dynamics?
A
9
Q
how are spectroscopic parameters derived from spectra model fitting?
A
