2001A&A...378L..17N


Query : 2001A&A...378L..17N

2001A&A...378L..17N - Astronomy and Astrophysics, volume 378, L17-20 (2001/10-4)

Binaries discovered by the SPY project. I. HE 1047-0436: A subdwarfB + white dwarf system.

NAPIWOTZKI R., EDELMANN H., HEBER U., KARL C., DRECHSEL H., PAULI E.-M. and CHRISTLIEB N.

Abstract (from CDS):

In the course of our search for double degenerate binaries as potential progenitors of type Ia supernovae with the UVES spectrograph at the ESO VLT (ESO SNIa Progenitor surveY - SPY) we discovered that the sdB star HE1047-0436 is radial velocity variable. The orbital period of 1.213253d, a semi-amplitude of 94km/s, and a minimum mass of the invisible companion of 0.44M are derived from the analysis of the radial velocity curve. We use an upper limit on the projected rotational velocity of the sdB star to constrain the system inclination and the companion mass to M>0.71M, bringing the total mass of the system closer to the Chandrasekhar limit. However, the system will merge due to loss of angular momentum via gravitational wave radiation only after several Hubble times. Atmospheric parameters and metal abundances are also derived. The resulting values are typical for sdB stars.

Abstract Copyright:

Journal keyword(s): stars: early-type - binaries: spectroscopic - stars: fundamental parameters - white dwarfs

Simbad objects: 3

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Number of rows : 3
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 PG 1047-046 HS* 10 50 26.8995243000 -04 52 35.718249540   14.68       sdB+D 26 0
2 Ton 245 HS* 15 40 23.4584740128 +26 48 29.782769184   13.653 13.859 14.073   sdB 47 0
3 KPD 1930+2752 HS* 19 32 14.8088063952 +27 58 35.445679608 12.80 13.75 13.82     sdB 159 0

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