J/A+A/562/A95 Orbital solutions of eight close sdB binaries (Geier+, 2014)
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., Muller S., Edelmann H., Classen L., McLeod A.F.
<Astron. Astrophys. 562, A95 (2014)>
=2014A&A...562A..95G 2014A&A...562A..95G
ADC_Keywords: Binaries, spectroscopic ; Stars, subdwarf ; Radial velocities
Keywords: binaries: spectroscopic - subdwarfs
Abstract:
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 0.1 to 10 days, 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.
Description:
Radial velocities of eight sdB binaries (Appendix A).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 100 9 Derived orbital solutions
rv.dat 60 147 Radial velocities
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See also:
J/A+A/430/223 : Parameters of cool companions of sdB stars (Lisker+, 2005)
J/A+A/559/A35 : FBS 0117+396 pulsating sdB star photometry (Ostensen+, 2013)
J/AJ/137/3181 : HW Vir differential VR light curves (Lee+, 2009)
J/MNRAS/408/L51 : 2M1938+4603 (KIC 9472174) eclipses (Ostensen+, 2010)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 17 A17 --- Name Object name
18 A1 --- n_Name [*] *: For BPS CS 22879-149, two orbital solutions
20- 21 I2 h RAh Simbad Right ascension (J2000)
23- 24 I2 min RAm Simbad Right ascension (J2000)
26- 30 F5.2 s RAs Simbad Right ascension (J2000)
32 A1 --- DE- Simbad Declination sign (J2000)
33- 34 I2 deg DEd Simbad Declination (J2000)
36- 37 I2 arcmin DEm Simbad Declination (J2000)
39- 42 F4.1 arcsec DEs Simbad Declination (J2000)
44- 51 F8.3 d T0 Time of maximum light (HJD-2450000)
53- 57 F5.3 d e_T0 ? rms uncertainty on T0
58- 65 F8.5 d Per Period
67- 73 F7.5 d e_Per ? rms uncertainty on Per
75- 79 F5.1 km/s gamma Systemic radial velocity, γ
81- 84 F4.1 km/s e_gamma rms uncertainty on gamma velocity
86- 90 F5.1 km/s K Radial velocity semi-amplitude, K
92- 95 F4.1 km/s e_K rms uncertainty on K
97-100 F4.1 km/s enorm Systematic error adopted to normalise the
reduced chi2
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Byte-by-byte Description of file: rv.dat
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Bytes Format Units Label Explanations
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1- 17 A17 --- Name Object name
21- 33 F13.5 --- HJD Heliocentric Julian date at mid-exposure
36- 41 F6.1 km/s RV Radial velocity
46- 49 F4.1 km/s e_RV 1-σ uncertainty of radial velocity
53- 60 A8 --- Inst Name of instrument used (EMMI, EFOSC2, FEROS,
Goodman, ISIS, TWIN, UVES or McDonald)
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Acknowledgements:
Stephan Geier, sgeier(at)eso.org
(End) Stephan Geier [ESO Garching, Germany], Patricia Vannier [CDS] 03-Jan-2014