Query : 2002A&A...384..433M

2002A&A...384..433M - Astronomy and Astrophysics, volume 384, 433-440 (2002/3-3)

Non-linear radial pulsation models for the early-type helium stars V652 Her and BX Cir.


Abstract (from CDS):

We report new non-linear pulsation models of the helium stars V652 Her and BX Cir. Linear theory has previously shown their pulsations to be due to iron-group bump instability. Recent high-resolution spectroscopic observations have provided high-precision measurements of their radial velocity curves and of their radii. Their masses remain less well determined. A hydrodynamic code including recent OPAL opacity data has been used to construct the models. These are compared with the observational data. In particular, we attempt to reproduce accurately the observed radial velocity and luminosity curves. The results impose additional constraints on those stellar dimensions, including mass, which remain poorly determined by observation. Final results show a model for V652 Her which reproduce the observed velocity and luminosity curves with 0.7M and 23400K. For BX Cir, the mass must lie between 0.50 and 0.38M if the temperature is in the range 22400-24000K. However, the luminosity of the models is smaller than that measured directly by a factor of two.

Abstract Copyright:

Journal keyword(s): stars: helium - stars: individual: V652 Her - stars: individual: BX Cir - stars: oscillations - stars: early-type

Simbad objects: 2

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Number of rows : 2
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 V* BX Cir Pu* 14 01 36.4829811264 -66 09 56.163698820 11.79 12.62 12.58 12.75   OB+ 59 0
2 V* V652 Her pA* 16 48 04.6934854032 +13 15 42.420402252   10.31 10.51     ~ 136 0

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