2011A&A...530A...2O


C.D.S. - SIMBAD4 rel 1.7 - 2021.01.27CET12:34:27

2011A&A...530A...2O - Astronomy and Astrophysics, volume 530A, 2-2 (2011/6-1)

A search for new hot subdwarf stars by means of Virtual Observatory tools.

OREIRO R., RODRIGUEZ-LOPEZ C., SOLANO E., ULLA A., OSTENSEN R. and GARCIA-TORRES M.

Abstract (from CDS):

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. 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 (α:225, δ:5deg). As a result of the procedure we obtained 38 hot subdwarf candidates, 23 of which had already a spectral classification. We have acquired spectroscopy for three other targets, and four additional ones have an available SDSS spectrum, which we used to determine their spectral type. A temperature estimate is provided for the candidates based on their spectral energy distribution, considering two-atmospheres fit for objects with clear infrared excess as a signature of the presence of a cool companion. Eventually, out of 30 candidates with spectral classification, 26 objects were confirmed to be hot subdwarfs, which means a contamination factor of only 13%. The high rate of success demonstrates the validity of the proposed strategy to find new uncatalogued hot subdwarfs. An application of this method to the entire sky will be presented in a forthcoming work.

Abstract Copyright:

Journal keyword(s): stars: early-type - subdwarfs - astronomical databases: miscellaneous - Virtual Observatory tools

VizieR on-line data: <Available at CDS (J/A+A/530/A2): table3.dat table7.dat>

Simbad objects: 81

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Number of rows : 81

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NAME SGP reg 00 51 26.275 -27 07 41.70           ~ 518 0
2 FBS 1412+004 HS? 14 14 35.2407503798 +00 12 35.170135566   15.88 15.7     sd 8 0
3 EGGR 439 WD* 14 24 37.3514186587 +02 34 18.806030099   16.9 16.77 16.6   DA2.3 12 0
4 PG 1532+034 WD* 15 35 09.8589099439 +03 11 15.413664185   15.14   15.8   DA.8 20 0
5 EGGR 491 HS* 15 43 38.6861492936 +00 12 02.157719431   17.19 16.75 16.49   sdB 16 0
6 GALEX J181948.3+332209 HS? 18 19 48.3182557521 +33 22 09.737135559           ~ 3 0
7 GALEX J182054.6+331846 HS? 18 20 54.7213512397 +33 18 46.611216017           ~ 4 0
8 GALEX J182057.7+370707 HS? 18 20 57.6856911920 +37 07 07.453333292           ~ 3 0
9 FBS 1819+348 HS* 18 21 09.7238414312 +34 46 44.273712567           sdOB 7 0
10 GALEX J182150.0+415155 HS? 18 21 50.0067009534 +41 51 56.297800559           sd+F/K 4 0
11 GALEX J182242.8+432037 HS* 18 22 42.8323305904 +43 20 38.850154517           sdOBHe 6 0
12 GALEX J182310.0+333353 HS? 18 23 10.1649690344 +33 33 53.725703474       15.31   ~ 3 0
13 FBS 1822+414 HS* 18 23 56.8043036527 +41 29 14.612465342   14.34 14.76     sdBO 12 0
14 GALEX J182359.6+515525 HS? 18 23 59.6058182780 +51 55 26.994607525   15.64 15.85     ~ 3 0
15 FBS 1822+352 WD* 18 24 08.2452816023 +35 16 18.663630853           DA 9 0
16 UCAC2 45189636 HS? 18 24 34.3926258442 +38 00 55.684948517       16.14   ~ 3 0
17 UCAC4 628-059367 HS? 18 24 43.4125395790 +35 30 42.779215198       16.19   ~ 3 0
18 GALEX J182448.7+385138 HS? 18 24 48.7324975129 +38 51 37.759558778       16.35   ~ 3 0
19 GALEX J182518.7+403333 HS? 18 25 18.7619722691 +40 33 33.736497299   15.84 15.94     ~ 3 0
20 UCAC2 43294177 HS? 18 26 22.5187736460 +32 51 07.811964473       15.36   ~ 4 0
21 GALEX J182637.0+343726 HS? 18 26 37.0597987634 +34 37 26.447137008       15.89   ~ 4 0
22 GALEX J182744.7+370931 HS? 18 27 44.7236606429 +37 09 31.062704232           ~ 3 0
23 GALEX J182754.9+362207 HS? 18 27 54.9174155221 +36 22 08.077423321           ~ 3 0
24 GALEX J182849.9+343650 HS? 18 28 49.9404197537 +34 36 49.936508382           ~ 3 0
25 GALEX J183221.4+550259 HS? 18 32 21.3997922898 +55 02 59.495872179           ~ 4 0
26 GALEX J183344.2+430106 HS? 18 33 44.3268942313 +43 01 06.425501396   16.16 16.21     ~ 3 0
27 GALEX J183454.2+444917 HS? 18 34 54.1281736584 +44 49 16.543218287   14.82 14.70 14.82   ~ 2 1
28 FBS 1833+434 HB* 18 35 16.9502242492 +43 27 30.767679581   14.29 14.19     B2 6 0
29 SDSS J183620.82+405938.5 HS? 18 36 20.8289492291 +40 59 38.489963829           ~ 3 0
30 GALEX J183634.3+531657 HS? 18 36 34.2690668591 +53 16 57.334010926   12.27 12.45 12.68   ~ 2 0
31 GALEX J183642.4+413045 HS? 18 36 42.4654155053 +41 30 47.147422488           sdB: 5 0
32 GALEX J183948.5+530004 HS? 18 39 48.4967086689 +53 00 03.702656523   15.97 16.07 16.32   ~ 3 0
33 UCAC4 659-066574 HS? 18 40 20.8766310726 +41 43 14.365680721   14.62 14.90 15.13   ~ 3 0
34 GALEX J184202.9+453159 HS? 18 42 02.8122578975 +45 31 59.077677924   14.10 14.39     ~ 4 0
35 KIC 8142623 HS* 18 42 42.4913746111 +44 04 05.579617260           sdB 8 0
36 KIC 7335517 HS* 18 43 06.7740009717 +42 59 18.072793175           sdO+dM 13 0
37 UCAC4 679-063773 HS? 18 43 55.5583609370 +45 37 56.936822969   15.84 16.23 16.31   ~ 4 0
38 HS 1844+5048 ** 18 45 55.7858118245 +50 51 18.725908123           ~ 5 0
39 KIC 10449976 HS* 18 47 14.1157500914 +47 41 46.790657263           sdOBHe 12 0
40 GALEX J184746.4+504134 HS* 18 47 46.2819072893 +50 41 34.886761289   14.27 14.58 15.00   sdB 4 0
41 GALEX J184915.1+511604 HS* 18 49 14.9871115503 +51 16 04.657917583   14.63 14.82 15.20   sdB 4 0
42 GALEX J185005.3+502422 HS? 18 50 05.2057751741 +50 24 21.933909784   15.38 15.20 15.38   ~ 3 0
43 KIC 8077281 Pu* 18 50 16.8584864718 +43 58 28.671168648           B 4 0
44 UCAC4 706-060577 HS? 18 50 45.7882665435 +51 07 38.372883154   13.50 13.62 14.03   ~ 3 0
45 GALEX J185758.0+444057 HS? 18 57 58.0162719889 +44 40 56.881915416   16.60 16.38 16.14   ~ 4 0
46 GALEX J190343.8+472438 HS? 19 03 43.849416 +47 24 38.94912   15.88 16.17 16.20   ~ 3 0
47 KIC 10784623 HS* 19 04 34.8390317726 +48 10 22.246353636           sdB 5 0
48 FBS 1903+432 HS* 19 05 06.3764795541 +43 18 31.219151136   15.08 15.48     sdB 26 1
49 GALEX J190520.0+445759 HS? 19 05 20.0203403523 +44 57 59.110738865   17.09 16.98     ~ 3 0
50 KIC 8874184 HS* 19 08 24.7489661168 +45 08 32.350341046           sdB 5 0
51 FBS 1907+425 HS* 19 08 45.8231977357 +42 38 31.045431445   15.24 15.36     sdB 12 0
52 GALEX J190920.1+454056 HS? 19 09 20.0190936327 +45 40 56.326154777   14.35 14.37 14.68   ~ 4 0
53 Kepler-429 HS* 19 09 33.4134010391 +46 59 04.107766133           sdB 23 0
54 KIC 9822180 HS* 19 10 00.1844996768 +46 40 24.502428406           sdO+F/G 4 0
55 GALEX J191023.7+470944 Pu* 19 10 23.7197696268 +47 09 44.175866194   10.94 10.98     B2V 9 0
56 KIC 9211123 HS* 19 14 27.6200390611 +45 39 09.631888676           sdB 8 0
57 KIC 10658302 Pu* 19 15 07.6765752542 +47 54 18.924026836           B3V 13 0
58 KIC 10593239 HS* 19 16 12.1070502799 +47 49 15.393523525           sdB+F/G 11 0
59 GALEX J192003.2+491533 HS? 19 20 03.2482510183 +49 15 32.232637392           ~ 4 0
60 UCAC4 691-065200 HS? 19 20 18.2539449067 +48 06 20.975142719   16.42 16.48     ~ 5 0
61 KIC 11293898 V* 19 20 36.2097154600 +49 03 15.702457787           B5V 7 0
62 KIC 11350152 HS* 19 26 51.3842430436 +49 08 48.334176223           sdB+F/G 9 0
63 GALEX J193049.4+542127 HS? 19 30 49.3944007335 +54 21 27.466638975           ~ 3 0
64 GALEX J193632.8+524518 HS? 19 36 32.8277557372 +52 45 18.519094556           ~ 2 0
65 KIC 10982905 HS* 19 40 32.3049584221 +48 27 23.534465920           sdB+F/G 6 0
66 RE J1943+500 WD* 19 43 43.6810051071 +50 04 37.925436113     14.8     DA1.4 44 0
67 GALEX J194442.8+544942 HS? 19 44 42.8539591894 +54 49 42.887193554   15.80 15.82 15.70   ~ 3 0
68 GALEX J195023.6+500859 HS? 19 50 23.5648382351 +50 08 59.341008585   13.95 13.89     ~ 3 0
69 GALEX J195304.2+494934 HS? 19 53 04.2713527990 +49 49 34.337531275           ~ 5 0
70 GALEX J195342.0+495944 HS? 19 53 42.1549119208 +49 59 44.123066707   15.85 16.27 16.10   ~ 2 0
71 KIC 10937527 Ro* 19 54 52.3109749861 +48 22 28.199132941           ~ 5 0
72 2MASS J19564769+5312177 HS? 19 56 47.6946762251 +53 12 17.527846993           ~ 3 0
73 GALEX J195728.4+533201 HS? 19 57 28.4207365783 +53 32 03.303350942   15.31 15.50 15.12   ~ 4 0
74 V* V476 Cyg No* 19 58 24.46 +53 37 07.5     17.1     ~ 103 0
75 LS III +54 101 * 19 59 18.5931814661 +54 20 11.929004139   11.91 11.98     OB- 5 0
76 GALEX J200001.2+540902 HS? 20 00 01.2630767420 +54 09 03.111381427   12.98 12.87 13.02   ~ 1 0
77 GALEX J200154.3+490354 HS? 20 01 54.3428737918 +49 03 54.315290003       15.95   ~ 4 0
78 BD+48 3035 * 20 06 32.6634616512 +48 33 28.580708894   9.66 9.58     A0 2 0
79 GALEX J200739.0+544516 HS? 20 07 39.1132514477 +54 45 16.601896202           ~ 3 0
80 GALEX J200934.4+550525 HS? 20 09 34.4134429889 +55 05 25.789771268           ~ 2 0
81 TYC 3940-616-1 HS? 20 11 52.2967475266 +54 50 11.803942253   10.77 10.41     ~ 1 0

    Equat.    Gal    SGal    Ecl

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2021.01.27-12:34:27

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