Asteroseismological Studies of Long‐Period Variable Subdwarf B Stars. II. Two‐Color Photometry of PG 1338+481
نویسندگان
چکیده
منابع مشابه
Synthetic photometry for non-radial pulsations in subdwarf B stars
We describe a method for computing theoretical photometric amplitude ratios for a number of modes of nonradially pulsating subdwarf B stars in both SDSS and UBVR systems. In order to avoid costly solutions of the non-adiabatic nonradial pulsation equations, we have adopted the adiabatic approximation. We argue that this is a valid approach, at least for the V361 Hya stars, because observations ...
متن کاملAsteroseismological measurements on PG 1159−035, the prototype of the GW Vir variable stars
Aims. An asteroseismological study of PG 1159−035, the prototype of the GW Vir variable stars, has been performed on the basis of detailed and full PG1159 evolutionary models presented by Miller Bertolami & Althaus (2006). Methods. We carried out extensive computations of adiabatic g-mode pulsation periods on PG1159 evolutionary models with stellar masses spanning the range 0.530 to 0.741M⊙. Th...
متن کاملPhotometry of four binary subdwarf B stars and the nature of their unseen companion stars
We present lightcurves of four binary subdwarf B stars, Ton 245, Feige 11, PG1432+159 and PG1017−086. We also present new spectroscopic data for PG1017−086 from which we derive its orbital period, P = 0.073d, and the mass function, fm = 0.0010±0.0002M⊙. This is the shortest period for an sdB binary measured to-date. The values of P and fm for the other sdB binaries have been published elsewhere...
متن کاملHot Subdwarf Stars among the Objects Rejected from the Pg Catalog: a First Assessment Using Galex Photometry
The hot subdwarf (sd) stars in the Palomar Green (PG) catalog of ultraviolet excess (UVX) objects play a key role in investigations of the frequency and types of binary companions and the distribution of orbital periods. These are important for establishing whether and by which channels the sd stars arise from interactions in close binary systems. It has been suggested that the list of PG sd st...
متن کاملMass loss predictions for Subdwarf B stars
We present the results of Monte Carlo mass-loss computations for hot low-mass stars, specifically for Subdwarf B (SdB) stars. It is shown that the massloss rates on the Horizontal Branch (HB) computed from radiative line-driven wind models are not high enough to create SdB stars. We argue, however, that mass loss plays a role in the chemical abundance patterns observed both in field SdB stars, ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2006
ISSN: 0004-637X,1538-4357
DOI: 10.1086/504459