2014A&A...565A..76C


C.D.S. - SIMBAD4 rel 1.7 - 2019.08.22CEST23:09:48

2014A&A...565A..76C - Astronomy and Astrophysics, volume 565A, 76-76 (2014/5-1)

Seismic models of O and B stars with Kurucz's opacity data.

CUGIER H.

Abstract (from CDS):

We investigated seismic models of O and B stars calculated with the new Kurucz opacities implemented in the Opacity Project (OP) and Rogers & Iglesias OPAL opacity tables (OPAL). We studied the problem using Dziembowski's computer codes for linear, nonadiabatic, and nonradial oscillations. We considered seismic models of main sequence (MS) stars for different chemical compositions of elements in the mass-range 9≤M≤70M. The new opacity bump at lgT≃5.06 that occurs in Kurucz's data influences evolutionary tracks mainly for M ≥30M and markedly changes the driving zone for pulsations of stars in the whole mass range studied. We obtained no unstable oscillation modes for models corresponding to the abundance parameter Z≤0.013 and only unstable low-frequency g-modes for 0.013<Z≤0.021. The opacity bump at lgT≃5.3 should be significantly larger than the opacity bump at lgT≃5.06 to drive pulsations of B stars in low-degree p-modes. Models with an increased OPAL (or OP) opacity bump at lgT≃5.3 by a factor of about 1.7 have sufficiently large driving zones to excite modes in the β Cephei frequency-domain for 0.003≤Z≤0.021. These values of Z are in a good agreement with those derived spectroscopically for stars in the Galaxy and Magellanic Clouds.

Abstract Copyright:

Journal keyword(s): asteroseismology - atomic data - stars: early-type - pulsars: general

Simbad objects: 4

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Number of rows : 4

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9018 1
2 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 5315 1
3 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14211 1
4 V* FG Vir dS* 12 14 15.4567370777 -05 42 59.750421714   6.807 6.558     A8/9V 206 0

    Equat.    Gal    SGal    Ecl

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2019.08.22-23:09:48

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