2011A&A...526A..39G


Query : 2011A&A...526A..39G

2011A&A...526A..39G - Astronomy and Astrophysics, volume 526A, 39-39 (2011/2-1)

Massive unseen companions to hot faint underluminous stars from SDSS (MUCHFUSS). Analysis of seven close subdwarf B binaries.

GEIER S., MAXTED P.F.L., NAPIWOTZKI R., OSTENSEN R.H., HEBER U., HIRSCH H., KUPFER T., MUELLER S., TILLICH A., BARLOW B.N., OREIRO R., OTTOSEN T.A., COPPERWHEAT C., GAENSICKE B.T. and MARSH T.R.

Abstract (from CDS):

The project Massive Unseen Companions to Hot Faint Underluminous Stars from SDSS (MUCHFUSS) aims at finding hot subdwarf stars with massive compact companions like massive white dwarfs (M>1.0M), neutron stars or stellar mass black holes. The existence of such systems is predicted by binary evolution theory and recent discoveries indicate that they exist in our Galaxy. First results are presented for seven close binary sdBs with short orbital periods ranging from ≃0.21d to 1.5d. The atmospheric parameters of all objects are compatible with core helium-burning stars. The companions are most likely white dwarfs. In one case the companion could be shown to be a white dwarf by the absence of light-curve variations. However, in most cases late type main sequence stars cannot be firmly excluded. Comparing our small sample with the known population of close sdB binaries we show that our target selection method aiming at massive companions is efficient. The minimum companion masses of all binaries in our sample are high compared to the reference sample of known sdB binaries.

Abstract Copyright:

Journal keyword(s): subdwarfs - binaries: spectroscopic - binaries: close - white dwarfs

Simbad objects: 10

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Number of rows : 10
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 PB 5916 HS* 00 23 23.9888810856 -00 29 53.303337780   15.50 15.58 15.93   sdB 17 0
2 HD 49798 HXB 06 48 04.7001531360 -44 18 58.436036028 6.758 8.017 8.287 8.391 8.543 sdO6 301 0
3 PG 1136-003 HS* 11 38 40.6873530648 -00 35 31.775883972   14.22 14.47 14.79   sdB1VIIeHe1 24 0
4 PG 1502+113 HS* 15 05 13.5273847872 +11 08 36.707510400   15.14 15.38 15.87   sdB 11 0
5 PG 1652+307 HS* 16 54 04.2604280400 +30 37 01.824863592   15.20 15.41 15.77   sdB 12 0
6 PG 1724+278 HS* 17 26 24.0995740464 +27 44 19.354086276   15.94       sdOB 11 0
7 PSR J1802-2124 Psr 18 02 05.44 -21 24 02.9           ~ 64 1
8 KPD 1930+2752 HS* 19 32 14.8088063952 +27 58 35.445679608 12.80 13.75 13.82     sdB 150 0
9 SDSS J204613.40-045418.7 HS* 20 46 13.3997229312 -04 54 18.732467916   15.96 16.32     sdB 10 0
10 PG 2254+067 HS* 22 56 38.3455333032 +06 56 51.179249220   15.18       sdB 14 0

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2022.05.28-23:01:07

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