Projection effects in the spectra of early-type pulsating stars

Details Projection effects in the spectra of early-type pulsating stars Projection effects in the spectra of early-type pulsating stars

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26a...375..411m&link_type=abstract

Astronomy and Astrophysics, v.375, p.411-418 (2001)

Astronomy and Astrophysics

Astrophysics

8

Stars: Early-Type, Stars: Pulsations, Stars: Atmospheres

Scientific paper

The relation between the surface velocity of a pulsating star in the star's inertial frame and the apparent expansion velocity measured by a remote observer has been classically formulated in terms of a projection factor p. This factor depends on the relative limb darkening in continuum and spectral lines and may therefore be a function of composition. We have computed synthetic spectra to investigate the behaviour of p and, indeed, of the apparent line profile for radially pulsating stars over a range of temperature and gravity with hydrogen-rich and hydrogen-poor atmospheres. We have subsequently derived values of p suitable for the interpretation of velocity measurements of pulsating early type stars. Effective temperature has the most important influence on p: a change of 10 000 K, in T_eff introduces a change of 2-3 per cent with important consequences for measurements of stellar radii to an accuracy <1%.

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