2014A&A...562A..95G

Query : 2014A&A...562A..95G

2014A&A...562A..95G - Astronomy and Astrophysics, volume 562A, 95-95 (2014/2-1)

Orbital solutions of eight close sdB binaries and constraints on the nature of the unseen companions.

GEIER S., OSTENSEN R.H., HEBER U., KUPFER T., MAXTED P.F.L., BARLOW B.N., VUCKOVIC M., TILLICH A., MUELLER S., EDELMANN H., CLASSEN L. and McLEOD A.F.

Abstract (from CDS):

The project Massive Unseen Companions to Hot Faint Underluminous Stars from SDSS (MUCHFUSS) aims at finding hot subdwarf stars (sdBs) with massive compact companions such as white dwarfs, neutron stars, or stellar-mass black holes. In a supplementary programme we obtained time-resolved spectroscopy of known hot subdwarf binary candidates. Here we present orbital solutions of eight close sdB binaries with orbital periods ranging from ∼0.1d to 10d, which allow us to derive lower limits on the masses of their companions. Additionally, a dedicated photometric follow-up campaign was conducted to obtain light curves of the reflection-effect binary HS 2043+0615. We are able to constrain the most likely nature of the companions in all cases but one, making use of information derived from photometry and spectroscopy. Four sdBs have white dwarf companions, while another three are orbited by low-mass main sequence stars of spectral type M.

Abstract Copyright: ∼

Journal keyword(s): binaries: spectroscopic - subdwarfs

VizieR on-line data: <Available at CDS (J/A+A/562/A95): table1.dat rv.dat>

Simbad objects: 17

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Number of rows : 17
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 2359+197 HS* 00 02 08.4740452488 +19 59 13.142278968   14.40       sdB 18 0
2 FBS 0117+396 HS* 01 20 22.9396883304 +39 50 59.434295604   15.15 15.34     sdB+dM 28 0
3 HE 0230-4323 HS* 02 32 54.6772339416 -43 10 27.791218308     13.78     sdB 33 0
4 V* IQ Cam HS* 04 26 06.8650883976 +54 28 17.101122600 14.21 14.86 14.66     sdB 64 0
5 KUV 04421+1416 HS* 04 44 56.8983457992 +14 21 50.176351836   15.28       sdB 39 0
6 Ton 22 HS* 09 43 54.5499190968 +27 46 59.158337664   12.95 13.24     sdB 22 0
7 BD-07 3477 HS* 12 44 20.2386233232 -08 40 16.846099536   10.46 10.594 10.895   sdB2VIIHe3 288 1
8 V* NY Vir HS* 13 38 48.1466908176 -02 01 49.207286748   13.43 13.66 13.75   sdB1VIIHe1 226 1
9 V* V361 Hya HS* 14 05 33.018072 -27 01 34.01328   15.446 15.258 15.161   sdB+ 123 0
10 CD-30 11223 HS* 14 11 16.1541452856 -30 53 03.700889340   12.101 12.296 12.659 12.541 sdB+DA 68 0
11 HE 1415-0309 HS* 14 18 20.9257079448 -03 22 53.992919352   16.6   16.3   sdB 14 0
12 OGLE BUL-SC16 335 * 18 09 48.2260900608 -26 41 49.486723692       16.04   M 18 1
13 KPD 1946+4340 HS* 19 47 42.8876526504 +43 47 30.754543092 13.05 14.06 14.23 14.92   sdOB+D 60 0
14 HS 2043+0615 HS* 20 46 20.7938414832 +06 26 25.336612716   16.9   16.20   sdB 13 0
15 BPS CS 22879-0149 HS* 20 57 15.2707546848 -38 11 51.424800648 13.11 14.11 14.24 14.61   sdB 11 0
16 LB 1516 HS* 23 01 56.1476771616 -48 03 48.474964296   12.74 13.02     sdB 31 0
17 PG 2345+318 HS* 23 48 07.5058804680 +32 04 48.038131020   13.99 14.19 14.66   sdB 30 0

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