J/A+A/530/A2 New hot subdwarf stars (Oreiro+, 2011)
A search for new hot subdwarf stars by means of Virtual Observatory tools.
Oreiro R., Rodriguez-Lopez C., Solano E., Ulla A., Ostensen R.,
Garcia-Torres M.
<Astron. Astrophys., 530, A2 (2011)>
=2011A&A...530A...2O 2011A&A...530A...2O
ADC_Keywords: Stars, early-type ; Stars, subdwarf ; Photometry
Keywords: stars: early-type - subdwarfs -
astronomical databases: miscellaneous - Virtual Observatory tools
Abstract:
Recent massive sky surveys in different bandwidths are providing new
opportunities to modern astronomy. The Virtual Observatory (VO)
provides the adequate framework to handle the huge amount of
information available and filter out data according to specific
requirements.
Hot subdwarf stars are faint, blue objects, and are the main
contributors to the far-UV excess observed in elliptical galaxies.
They offer an excellent laboratory to study close and wide binary
systems, and to scrutinize their interiors through asteroseismology,
since some of them undergo stellar oscillations. However, their
origins are still uncertain, and increasing the number of detections
is crucial to undertake statistical studies. In this work, we aim at
defining a strategy to find new, uncatalogued hot subdwarfs.
Description:
Making use of VO tools we thoroughly search stellar catalogues to
retrieve multi-colour photometry and astrometric information of a
known sample of blue objects, including hot subdwarfs, white dwarfs,
cataclysmic variables and main-sequence OB stars. We define a
procedure to distinguish among these spectral classes, which is
particularly designed to obtain a hot subdwarf sample with a low
contamination factor. To check the validity of the method, this
procedure is then applied to two test sky regions: to the Kepler FoV
and to a test region of 300deg2 around (RA:225°, DE:5°).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 114 15 List of candidates in the Kepler field-of-view
table7.dat 60 73 List of the 73 candidates in and around the
Kepler field-of-view that fulfil the
photometric and proper motion criteria
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See also:
V/133 : Kepler Input Catalog (Kepler Mission Team, 2009)
III/137 : Spectroscopically identified hot subdwarfs (Kilkenny+ 1988)
J/A+A/317/689 : Hot subdwarfs proper motions (Thejll+ 1997)
J/A+A/430/223 : Parameters of cool companions of sdB stars (Lisker+, 2005)
J/AJ/126/1455 : 2MASS photometry of hot subdwarf stars (Stark+, 2003)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 2 I2 h RAh Right ascension (J2000)
4- 5 I2 min RAm Right ascension (J2000)
7- 8 I2 s RAs Right ascension (J2000)
10 A1 --- DE- Declination sing (J2000)
11- 12 I2 deg DEd Declination (J2000)
14- 15 I2 arcmin DEm Declination (J2000)
17- 18 I2 arcsec DEs Declination (J2000)
20- 25 F6.3 mag FUVmag GALEX FUV magnitude
27- 32 F6.3 mag NUVmag GALEX NUV magnitude
34- 39 F6.3 mag g'mag KIC g' magnitude
41- 46 F6.3 mag r'mag KIC r' magnitude
48- 53 F6.3 mag i'mag KIC i' magnitude
55- 60 F6.3 mag z'mag KIC z' magnitude
62- 66 F5.2 mag Jmag 2MASS J magnitude
68 A1 --- l_Hmag Limit flag on Hmag
69- 73 F5.2 mag Hmag 2MASS H magnitude
75 A1 --- l_Kmag Limit flag on Kmag
76- 80 F5.2 mag Kmag 2MASS Ks magnitude
82- 86 I5 K Teff Effective temperature form best SED fit
performed by VOSA
87 A1 --- f_Teff [*] * indicates that a poor SED fit is
obtained
89- 95 A7 --- SpType Spectral classification
97-104 I8 --- KIC KIC number (Cat. V/133)
106-112 A7 --- Com Comments about binarity, variability, ... (1)
114 A1 --- r_SpType [ab] Reference for SpType (2)
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Note (1): Notes as follows:
Qx = Kepler survey cycle of observation
N = no particular features in the light curve
R = reflecting binary
G = g-mode pulsator
I = irregular variable
C = variability from the companion
Note (2): Spectral classification reference as follows:
a = from Ostensen et al. (2010MNRAS.409.1470O 2010MNRAS.409.1470O)
b = from Ostensen et al. (2011, accepted)
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Byte-by-byte Description of file: table7.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 I2 h RAh Right ascension (J2000)
4- 5 I2 min RAm Right ascension (J2000)
7- 8 I2 s RAs Right ascension (J2000)
10 A1 --- DE- Declination sing (J2000)
11- 12 I2 deg DEd Declination (J2000)
14- 15 I2 arcmin DEm Declination (J2000)
17- 18 I2 arcsec DEs Declination (J2000)
20- 25 F6.3 mag FUVmag GALEX FUV magnitude
27- 32 F6.3 mag NUVmag GALEX NUV magnitude
34- 38 F5.2 mag Jmag 2MASS J magnitude
40- 44 F5.2 mag Hmag 2MASS H magnitude
46- 50 F5.2 mag Kmag KMASS Ks magnitude
52- 59 I8 --- KIC ? KIC number (Cat. V/133)
60 A1 --- n_KIC [*] * for objects meeting all the selection
criteria, detailed in Table 3
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 26-Aug-2011