J/A+A/577/A26 Radial velocities of hot subluminous stars (Geier+, 2015)
The catalogue of radial velocity variable hot subluminous stars from the
MUCHFUSS project.
Geier S., Kupfer T., Heber U., Schaffenroth V., Barlow B.N., Oestensen R.H.,
O'Toole S.J., Ziegerer E., Heuser C., Maxted P.F.L., Gaensicke B.T.,
Marsh T.R., Napiwotzki R., Bruenner P., Schindewolf M., Niederhofer F.
<Astron. Astrophys. 577, A26 (2015)>
=2015A&A...577A..26G 2015A&A...577A..26G
ADC_Keywords: Stars, faint ; Radial velocities
Keywords: binaries: spectroscopic - subdwarfs - stars: horizontal branch -
stars: atmospheres
Abstract:
The project Massive Unseen Companions to Hot Faint Underluminous Stars
from SDSS (MUCHFUSS) aims to find sdBs with compact companions such as
massive white dwarfs, neutron stars, or black holes. Here we provide
classifications, atmospheric parameters, and a complete radial
velocity (RV) catalogue containing 1914 single measurements for a
sample of 177 hot subluminous stars discovered based on SDSS DR7; 110
stars show significant RV variability, while 67 qualify as candidates.
We constrain the fraction of close massive compact companions of
hydrogen-rich hot subdwarfs in our sample to be smaller than 1.3%,
which is already close to the theoretical predictions. However, the
sample might still contain such binaries with longer periods
exceeding 8d. We detect a mismatch between the
ΔRVmax-distribution of the sdB and the more evolved sdOB and
sdO stars, which challenges our understanding of their evolutionary
connection. Furthermore, irregular RV variations of unknown origin
with amplitudes of up to 180km/s on timescales of years, days, and
even hours have been detected in some He-sdO stars. They might be
connected to irregular photometric variations in some cases.
Description:
Radial velocities of 177 RV-variable hot subluminous stars and
candidates from the MUCHFUSS project are provided.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 121 139 Parameters of 139 hydrogen-rich hot subdwarfs
(89 RV variable, 50 RV variable candidates)
table4.dat 121 25 Parameters of 25 helium-rich hot subdwarfs
(14 RV variable, 11 RV variable candidates)
table5.dat 121 13 Parameters of 13 other types of hot stars
(7 RV variable, 6 RV variable candidates)
tablea1.dat 121 19 Parameters of 19 stars with non-significant RV
variations
rv.dat 63 1914 Radial velocities and epochs for 177 stars
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See also:
J/A+A/530/A28 : Priority targets for the MUCHFUSS project (Geier+, 2011)
J/A+A/559/A35 : FBS 0117+396 pulsating sdB star photometry (Ostensen+, 2013)
Byte-by-byte Description of file: table3.dat table4.dat table5.dat tablea1.dat
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Bytes Format Units Label Explanations
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1- 19 A19 --- Name SDSS name (JHHMMSS.ss+DDMMSS.s)
20 A1 --- r_Name [a-k] Origin of atmospheric parameterp (1)
21 A1 --- n_Name [*] * indicates solved binaries (2)
23- 29 A7 --- Class Classification
31- 34 F4.1 mag Vmag V magnitude
36- 41 I6 K Teff [15100/100000]?=- Effective temperature
43- 47 I5 K E_Teff ? Error on Teff (upper value)
49- 53 I5 K e_Teff ? Error on Teff (upper value)
55- 58 F4.2 [cm/s] logg [4/6.5]?=- Surface gravity
60- 63 F4.2 [cm/s] e_logg [0.01/0.4]? rms uncertainty on logg
65 A1 --- l_logy Limit flag on logy
66- 69 F4.1 [-] logy [-4/2]?=- He-enrichment
71- 73 F3.1 [-] e_logy [0.1/0.9]? rms uncertainty on logy
75- 78 F4.1 kpc d [1.2/52]?=- Distance
80- 83 F4.1 kpc E_d ?=- Error on distance (upper value)
85- 88 F4.1 kpc e_d ?=- Error on distance (lower value)
90- 98 F9.4 d Dt Timespan between the two epochs used for
DRVmax
100-104 F5.1 km/s DRVmax [20/361] Maximum radial velocity shift
106-109 F4.1 km/s e_DRVmax Average 1σ uncertainty on the two
corresponding measurements of DRVmax
111-112 I2 --- N [2/59] Number of radial velocity measurements
114 A1 --- l_logp Limit flag on logp
115-121 F7.2 [-] logp [-681/-0.2] False-detection probability
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Note (2): Solved binaries. Their orbital parameters can be found in
Kupfer et al. (2015, A&A, in press) and references therein.
Note (1): Notes as follows:
a = Atmospheric parameters taken from Geier et al., 2011, Cat. J/A+A/530/A28
b = Atmospheric parameters taken from Kupfer et al., 2015, A&A, in press
c = Atmospheric parameters taken from Geier et al., 2010A&A...519A..25G 2010A&A...519A..25G
d = Atmospheric parameters taken from Schaffenroth et al., 2014A&A...564A..98S 2014A&A...564A..98S
e = Atmospheric parameters taken from Ostensen et al., 2013, Cat. J/A+A/559/A35
f = Atmospheric parameters taken from Schaffenroth et al. in prep.
g = Atmospheric parameters taken from Geier et al., 2011ApJ...731L..22G 2011ApJ...731L..22G
h = Atmospheric parameters derived from a spectrum taken with ESO-VLT/FORS1
i = Atmospheric parameters derived from a spectrum taken with WHT/ISIS
j = Atmospheric parameters taken from Werner et al., 2014A&A...564A..53W 2014A&A...564A..53W
k = Atmospheric parameters taken from Reindl et al., 2015, A&A, in prep.
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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- 19 A19 --- Name SDSS name (JHHMMSS.ss+DDMMSS.s)
22- 35 F14.6 d HJD Mid-exposure heliocentric Julian date
40- 45 F6.1 km/s RV Heliocentric corrected radial velocity
50- 53 F4.1 km/s e_RV Uncertainty of radial velocity
57- 63 A7 ---- Inst Spectrograph used to obtain data
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Acknowledgements:
Stephan Geier, sgeier(at)eso.org
(End) Stephan Geier [ESO Garching, Germany], Patricia Vannier [CDS] 09-Mar-2015