Cpd−20 1123 (albus 1) Is a Bright He-b Subdwarf
نویسنده
چکیده
Based on photometric and astrometric data it has been proposed that Albus 1 (also known as CPD−2
منابع مشابه
Impact of helium diffusion and helium-flash-induced carbon production on gravity-mode pulsations in subdwarf B stars
Context. Realistic stellar models are essential to the forward modelling approach in asteroseismology. For practicality however, certain model assumptions are also required. For example, in the case of subdwarf B stars, one usually starts with zero-age horizontal branch structures without following the progenitor evolution. Aim s. We analyse the effects of common assumptions in subdwarf B model...
متن کامل7 Albus 1 : A very bright white dwarf candidate
We have serendipitously discovered a previously-unknown, bright source (BT = 11.75±0.07mag) with a very blue VT − Ks color, to which we have named Albus 1. A photometric and astrometric study using Virtual Observatory tools has shown that it possesses an appreciable proper motion and magnitudes and colors very similar to those of the well known white dwarf G 191–B2B. We consider Albus 1 as a DA...
متن کاملImpact of helium diffusion and helium-flash-induced carbon production on gravity-mode pulsations in subdwarf B stars
Context. Realistic stellar models are essential to the forward modelling approach in asteroseismology. For practicality however, certain model assumptions are also required. For example, in the case of subdwarf B stars, one usually starts with zero-age horizontal branch structures without following the progenitor evolution. Aim s. We analyse the effects of common assumptions in subdwarf B model...
متن کاملClose Binary Ehb Stars from Spy * † ‡
We present the results of a radial velocity (RV) survey of 46 subdwarf B (sdB) and 23 helium-rich subdwarf O (He-sdO) stars. We detected 18 (39%) new sdB binary systems, but only one (4%) He-sdO binary. Orbital parameters of nine sdB and sdO binaries, derived from follow-up spectroscopy, are presented. Our results are compared with evolutionary scenarios and previous observational investigations.
متن کاملImpact of helium diffusion and helium-flash-induced carbon production on gravity-mode pulsations in subdwarf B stars
Context. Realistic stellar models are essential to the forward modelling approach in asteroseismology. For practicality however, certain model assumptions are also required. For example, in the case of subdwarf B stars, one usually starts with zero-age horizontal branch structures without following the progenitor evolution. Aims. We analyse the effects of common assumptions in subdwarf B models...
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تاریخ انتشار 2008