2022MNRAS.514.2434G

Query : 2022MNRAS.514.2434G

2022MNRAS.514.2434G - Mon. Not. R. Astron. Soc., 514, 2434-2449 (2022/August-1)

Hot white dwarf candidates from the IGAPS-GALEX cross-match.

GOMEZ-MUNOZ M.A., SABIN L., RADDI R. and WELLS R.D.

Abstract (from CDS):

White dwarf (WD) stars are often associated with the central stars of planetary nebulae (CSPNe) on their way to the cooling track. A large number of WD star candidates have been identified; thanks to optical large-scale surveys such as Gaia DR2 and EDR3. However, hot-WD/CSPNe stars are quite elusive in optical bands due to their high temperatures and low-optical luminosities. The Galaxy Evolution Explorer (GALEX) matched with the INT Galactic Plane Survey (IGAPS) allowed us to identify hot-WD candidates by combining the GALEX far-UV (FUV)and near-UV (NUV)with optical photometric bands (g, r, i, and Hα). After accounting for source confusion and filtering bad photometric data, a total of 236 485 sources were found in the GALEX and IGAPS footprint (GaPHAS). A preliminary selection of hot stellar sources was made using the GALEX colour cut on FUV-NUV> -0.53, yielding 74 hot-WD candidates. We analysed their spectral energy distribution (SED) by developing a fitting program for single- and two-body SED using an MCMC algorithm; 41 are probably binary systems (a binary fraction of ∼55 per cent was estimated). Additionally, we classified the WD star candidates using different infrared (IR) colours available for our sample, obtaining similar results as in the SED analysis for the single and binary systems. This supports the strength of the fitting method and the advantages of the combination of GALEX UV with optical photometry. Ground-based time-series photometry and spectra are required in order to confirm the nature of the WD star candidates.

Abstract Copyright: © 2022 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society

Journal keyword(s): surveys - (stars:) binaries: general - (stars:) white dwarfs - catalogues

Simbad objects: 75

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Number of rows : 75
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 Lan 578 WD* 01 29 02.5220632536 +64 44 29.172058260           DA 7 0
2 GALEX J014150.5+650546 WD? 01 41 50.5555841404 +65 05 46.877879624           ~ 1 0
3 GALEX J015418.1+654741 WD? 01 54 18.0047105376 +65 47 41.636759316           ~ 3 0
4 GALEX J023215.3+632116 WD? 02 32 15.2938345528 +63 21 15.902208069   16.554 15.778 15.703   ~ 1 0
5 GALEX J023223.0+632040 ** 02 32 23.07312 +63 20 41.0280       16.152   ~ 1 0
6 GALEX J023500.3+632736 WD? 02 35 00.5476521360 +63 27 37.080702864           ~ 3 0
7 GALEX J023527.6+632739 WD? 02 35 27.8098098064 +63 27 38.391720752           ~ 1 0
8 GALEX J024130.7+632923 WD? 02 41 30.8786684376 +63 29 23.888480280           ~ 3 0
9 GALEX J024713.5+644122 WD? 02 47 13.5238684608 +64 41 22.500842856           ~ 3 0
10 GALEX J024849.3+640930 WD* 02 48 49.3216022352 +64 09 30.433586364           DC: 5 0
11 GALEX J024934.3+643638 WD? 02 49 33.9927527425 +64 36 43.096241610           ~ 1 0
12 GALEX J025236.2+544506 WD? 02 52 36.5345056032 +54 45 06.958606644           ~ 3 0
13 GALEX J025319.6+544414 WD? 02 53 19.4926406968 +54 44 14.134994821           ~ 1 0
14 Lan 299 WD? 02 59 31.0507157088 +55 08 06.368964036           ~ 5 0
15 GALEX J031048.6+530023 WD? 03 10 48.6377974306 +53 00 22.758584717           ~ 1 0
16 GALEX J031935.9+531424 WD? 03 19 36.0568173096 +53 14 25.139362776           ~ 4 0
17 UVEX J032807.05+525737.2 WD* 03 28 07.0557381936 +52 57 37.488721824 17.814         DA 8 0
18 GALEX J033300.5+604529 WD? 03 33 00.6320861160 +60 45 29.543924072           ~ 1 0
19 GALEX J033300.8+524748 WD* 03 33 00.7480526184 +52 47 48.226572168           DA 6 0
20 GALEX J034015.0+615205 WD? 03 40 15.2270052463 +61 52 04.094274350   16.210 15.440 15.217   ~ 1 0
21 GALEX J034631.6+590920 WD? 03 46 31.5826542912 +59 09 20.344822704           ~ 4 0
22 GALEX J035010.7+600113 WD? 03 50 10.6540184136 +60 01 13.986236460           ~ 3 0
23 GALEX J035110.3+590055 WD? 03 51 10.3756496640 +59 00 55.739732940           ~ 3 0
24 GALEX J035737.3+570305 WD? 03 57 37.372392 +57 03 03.81312   16.466 15.470 15.201   ~ 1 0
25 GALEX J035934.1+571347 WD? 03 59 34.4091046964 +57 13 48.490495961       15.711   ~ 2 0
26 GALEX J040144.5+461435 WD? 04 01 44.5291006056 +46 14 34.167726024           ~ 3 0
27 GALEX J040522.5+555338 WD? 04 05 22.6204023385 +55 53 39.335693365           ~ 3 0
28 GALEX J040613.0+561235 WD? 04 06 13.1759843201 +56 12 33.921477008           ~ 1 0
29 GALEX J041039.5+444842 WD? 04 10 39.5273485085 +44 48 40.857287719           ~ 3 0
30 GALEX J041531.6+450210 WD? 04 15 31.6470253584 +45 02 09.247206876           ~ 3 0
31 GALEX J042327.6+445224 WD* 04 23 27.6980789280 +44 52 24.024146412           DA 8 0
32 GALEX J042553.8+441907 WD? 04 25 53.8748188206 +44 19 07.580181803           ~ 2 0
33 GALEX J042641.6+444404 WD? 04 26 41.6512952008 +44 44 04.689020052       14.839   ~ 1 0
34 GALEX J042646.8+444613 WD? 04 26 46.8589011476 +44 46 12.314497682           ~ 2 0
35 GALEX J042703.3+414349 WD* 04 27 03.3472665600 +41 43 49.299681972           DA 5 0
36 GALEX J042756.3+413000 WD? 04 27 56.3833122325 +41 30 00.574803547           ~ 1 0
37 GALEX J042837.3+411452 WD? 04 28 37.2973030063 +41 14 52.621301540           ~ 1 0
38 GALEX J043005.0+481611 WD? 04 30 05.0634193128 +48 16 12.017649144           ~ 4 0
39 GALEX J043137.7+415248 BY* 04 31 37.7931594820 +41 52 49.213441244           ~ 3 0
40 GALEX J043143.2+415246 WD? 04 31 43.4268498803 +41 52 46.975683824   16.559 16.063 15.817   ~ 1 0
41 GALEX J043145.8+445459 WD? 04 31 45.9449637223 +44 54 58.709601373   15.466 14.607 14.464   ~ 1 0
42 GALEX J043325.9+413115 WD? 04 33 26.0081422502 +41 31 16.147105856           ~ 1 0
43 GALEX J043519.0+543932 WD? 04 35 19.1652871395 +54 39 32.767837936           ~ 1 0
44 GALEX J043827.3+473238 WD* 04 38 27.2949504336 +47 32 38.273350740           DA 6 0
45 GALEX J044326.5+464518 WD? 04 43 26.6315043841 +46 45 20.292971437           ~ 1 0
46 GALEX J044447.0+394242 WD? 04 44 47.0598970080 +39 42 42.914269047           ~ 1 0
47 GALEX J044553.9+492825 WD? 04 45 54.0523047082 +49 28 24.179975328       16.138   ~ 1 0
48 GALEX J044635.0+480119 WD? 04 46 35.0427762453 +48 01 18.548091405           ~ 1 0
49 GALEX J044639.0+402002 WD? 04 46 39.0122037214 +40 20 03.286566276           ~ 1 0
50 GALEX J044822.9+483428 WD? 04 48 22.9340548870 +48 34 29.092087132   16.810 16.106 15.735   ~ 1 0
51 GALEX J044839.3+483602 WD? 04 48 39.5957007826 +48 36 06.023862499   16.052 15.466 15.365   ~ 1 0
52 GALEX J044923.5+491438 WD? 04 49 23.4119584067 +49 14 40.435923906           ~ 1 0
53 GALEX J044925.3+490701 WD? 04 49 25.3613352734 +49 07 01.554756492           ~ 1 0
54 GALEX J045614.5+385509 WD? 04 56 14.6022518371 +38 55 09.550746729           ~ 2 0
55 GALEX J045703.8+485851 WD? 04 57 03.8632533564 +48 58 51.349917267           ~ 2 0
56 GALEX J045739.4+505756 WD* 04 57 39.4829154960 +50 57 57.600046476           DA 6 0
57 GALEX J045809.3+390538 WD? 04 58 09.3687365880 +39 05 38.739046236           ~ 2 0
58 GALEX J045841.5+364234 WD? 04 58 41.5753257121 +36 42 34.172092640           ~ 1 0
59 GALEX J045843.2+390047 WD? 04 58 43.3455957465 +39 00 46.458563738           ~ 1 0
60 GALEX J045854.9+482832 WD? 04 58 54.8168935416 +48 28 30.940956984           ~ 4 0
61 GALEX J045930.3+485822 WD? 04 59 30.01778880 +48 58 19.8790680           ~ 1 0
62 GALEX J045946.1+505231 WD? 04 59 46.2235364697 +50 52 31.832882583           ~ 1 0
63 GALEX J050117.3+485210 WD? 05 01 17.7047526719 +48 52 13.444086554           ~ 1 0
64 GALEX J050209.1+492514 WD? 05 02 09.1616355600 +49 25 14.009588652           ~ 2 0
65 GALEX J050405.6+383324 WD? 05 04 05.5448223694 +38 33 24.934889773       15.814   ~ 1 0
66 GALEX J050933.8+345105 WD? 05 09 33.7534983851 +34 51 04.898961138   15.880 15.044 15.039   ~ 1 0
67 GALEX J051008.2+321804 WD? 05 10 08.2368666696 +32 18 04.230820080           ~ 3 0
68 GALEX J051112.0+344723 WD? 05 11 12.0288962612 +34 47 22.508405018           ~ 1 0
69 GALEX J052925.7+402700 WD? 05 29 25.6779673259 +40 27 00.945549438           ~ 1 0
70 GALEX J053207.5+404445 WD? 05 32 07.6044611867 +40 44 45.261144595           ~ 1 0
71 GALEX J053659.5+395430 WD? 05 36 59.57669280 +39 54 29.9533680           ~ 1 0
72 GALEX J053955.6+395004 WD? 05 39 55.6333490595 +39 50 04.551867435           ~ 1 0
73 LP 141-14 WD* 18 57 39.3436703328 +53 30 33.301040904   17.6   16.4   DC 82 0
74 GALEX J190347.4+170141 WD? 19 03 47.5129714539 +17 01 40.595047792           ~ 1 0
75 GALEX J190443.1+172845 WD? 19 04 43.0683936903 +17 28 43.547771526           ~ 1 0

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