2001A&A...375..411M


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.13CEST23:30:18

2001A&A...375..411M - Astronomy and Astrophysics, volume 375, 411-418 (2001/8-4)

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

MONTANES RODRIGUEZ P. and JEFFERY C.S.

Abstract (from CDS):

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 10000K in Teff introduces a change of 2-3 per cent with important consequences for measurements of stellar radii to an accuracy <1%.

Abstract Copyright:

Journal keyword(s): stars: early-type - stars: pulsations - stars: atmospheres

Simbad objects: 2

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Number of rows : 2

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 V* BX Cir Pu* 14 01 36.4828935084 -66 09 56.163632037 11.79 12.62 12.58 12.75   OB+ 51 0
2 V* V652 Her pA* 16 48 04.6939316336 +13 15 42.415029639   10.31 10.51     ~ 123 0

    Equat.    Gal    SGal    Ecl

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2020.07.13-23:30:18

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