2007ApJ...660.1451K

Query : 2007ApJ...660.1451K

2007ApJ...660.1451K - Astrophys. J., 660, 1451-1461 (2007/May-2)

The lowest mass white dwarf.

KILIC M., ALLENDE PRIETO C., BROWN W.R. and KOESTER D.

Abstract (from CDS):

Extremely low mass white dwarfs are very rare objects likely formed in compact binary systems. We present MMT optical spectroscopy of 42 low-mass white dwarf candidates serendipitously discovered in a survey for hypervelocity B-type stars. One of these objects, SDSS J0917+46, has Teff=11,288±72 K and logg=5.48±0.03; with an estimated mass of 0.17 M☉, it is the lowest gravity/mass white dwarf currently known. However, 40 of the low-mass candidates are normal DA white dwarfs with apparently inaccurate SDSS g magnitudes. We revisit the identification of low-mass white dwarf candidates previously found in the SDSS and conclude that four objects have M<0.2 M☉. None of these white dwarfs show excess emission from a binary companion, and radial velocity searches will be necessary to constrain the nature of the unseen companions.

Abstract Copyright: ∼

Journal keyword(s): Stars: Low-Mass, Brown Dwarfs - Stars: White Dwarfs

Nomenclature: Table 1: [KAB2007] Cand NNN N=42 among (Nos 17-487).

Simbad objects: 65

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Number of rows : 65
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 GALEX J002207.6-101423 WD* 00 22 07.6572581736 -10 14 23.555210532           DA 24 0
2 GALEX J002228.3+003115 WD* 00 22 28.4509588368 +00 31 15.527797320           DA 19 0
3 GALEX J002803.3-001213 WD* 00 28 03.3447761304 -00 12 13.391169336           DA 16 0
4 GALEX J010044.7-005033 WD* 01 00 44.6825985600 -00 50 34.180973628           DA 4 0
5 GALEX J010657.7-100838 WD* 01 06 57.8352534816 -10 08 39.259473864           DA 5 0
6 GALEX J011130.7+141049 WD* 01 11 30.6752635728 +14 10 49.823828400           DAH 7 0
7 GALEX J020232.2-084918 WD* 02 02 32.2959361656 -08 49 18.298236180           DA 6 0
8 GALEX J031240.4-005940 WD* 03 12 40.4848510341 -00 59 41.099031424           DA 4 0
9 PSR J0437-47 Psr 04 37 15.7994581776 -47 15 08.544351636           DC 1032 0
10 GALEX J073734.8+215017 WD* 07 37 34.8808018248 +21 50 17.288441484           DA 5 0
11 GALEX J074508.2+182630 WD* 07 45 08.1574309944 +18 26 30.036482124           DA 5 0
12 PSR J0751+1807 Psr 07 51 09.1539 +18 07 38.335           ~ 316 1
13 GALEX J075637.7+203730 WD* 07 56 37.7403342960 +20 37 30.780960996           DA 12 0
14 SDSS J080234.61+432301.0 WD* 08 02 34.6276863528 +43 23 01.076083152           DA 8 0
15 GALEX J082003.0+250011 WD* 08 20 03.0284508408 +25 00 12.090888000           DA 5 0
16 SDSS J082212.57+275307.4 WD* 08 22 12.5767704408 +27 53 07.503424512           DA 31 0
17 GALEX J082542.5+080100 WD* 08 25 42.4891707240 +08 01 00.454263348           DA 9 0
18 GALEX J082823.5+470001 WD* 08 28 23.5582009488 +47 00 01.371106404           DA 13 0
19 SDSS J083303.03+365906.3 WD* 08 33 03.0300071952 +36 59 06.283856148           DA 19 0
20 SDSS J084823.75+050845.2 WD* 08 48 23.7484339176 +05 08 45.189755664   16.9   17.1   DA 7 0
21 SDSS J084910.13+044528.7 WD* 08 49 10.1295863640 +04 45 28.707340572   19.0   19.5   DA 30 0
22 US 1806 WD* 08 51 41.6050256400 +42 51 17.755062264   18.6       DA 8 0
23 GALEX J085652.6+233342 WD* 08 56 52.6574157480 +23 33 41.808991284           DA 13 0
24 GALEX J085859.8+050757 WD* 08 58 59.8235422944 +05 07 57.246010176           DA 8 0
25 SDSS J091709.55+463821.8 WD* 09 17 09.5538167784 +46 38 21.666153876           DA 39 0
26 GALEX J092001.9+005201 WD* 09 20 01.9371251232 +00 52 01.162436232           DA 5 0
27 GALEX J092918.1+374529 WD* 09 29 18.1327541856 +37 45 29.924491788           DA 5 0
28 GALEX J093955.3+054934 WD* 09 39 55.2919600704 +05 49 34.709856780           DA 11 0
29 GALEX J095030.5+385713 WD* 09 50 30.4677784464 +38 57 13.420830672           DA 15 0
30 BGG 263 WD* 09 56 41.2481263080 +68 57 27.462775032   18.46 18.56     DA 8 0
31 GALEX J095717.3+552838 WD* 09 57 17.3147632944 +55 28 39.240105204           DA 6 0
32 GALEX J100354.3+063849 WD* 10 03 54.4004227392 +06 38 50.677443348           DA 5 0
33 GALEX J100618.5+605500 WD* 10 06 18.5411296224 +60 55 00.717289608           DA 14 0
34 GALEX J100929.8+411205 WD* 10 09 29.8346028192 +41 12 05.236632360           DA 9 0
35 PSR J1012+5307 Psr 10 12 33.4345449600 +53 07 02.548542576     19.5     DA 419 1
36 GALEX J101519.6+595430 WD* 10 15 19.6331806992 +59 54 30.481544772           DA 18 0
37 GALEX J101557.0+510428 WD* 10 15 57.0164161176 +51 04 28.379963208   18.2   18.6   DA 9 0
38 GALEX J101647.5+375835 WD* 10 16 47.5011330096 +37 58 35.249085336           DA 9 0
39 GALEX J104650.5+510027 WD* 10 46 50.5200006240 +51 00 28.558347804           DA 15 0
40 GALEX J105353.8+520031 WD* 10 53 53.9102986512 +52 00 31.033370736           DA 37 0
41 GALEX J105610.9+653631 WD* 10 56 11.0245152024 +65 36 31.526253072   20.0   19.6   DA 24 0
42 SDSS J105850.47+432710.9 WD* 10 58 50.4773281224 +43 27 10.944782316           DA 5 0
43 2QZ J110200.0-004057 WD* 11 02 00.0685278960 -00 40 55.946289036   19.07       DA 7 0
44 GALEX J111908.6+033819 WD* 11 19 08.6553767208 +03 38 18.554546184           DA 5 0
45 GALEX J113807.1+143257 WD* 11 38 07.1552505744 +14 32 57.387912648           DA 7 0
46 GALEX J114344.9+052215 WD* 11 43 44.9619569304 +05 22 14.796449256           DA 11 0
47 GALEX J123410.3-022803 WD* 12 34 10.3676638032 -02 28 02.806799988   17.7   18.4   DA 41 0
48 2QZ J142601.4+010000 WD* 14 26 01.4759676504 +01 00 00.240510276           DA3 18 0
49 SBSS 1434+503 WD* 14 36 33.2892435360 +50 10 26.924868192   18.0       DA 41 0
50 GALEX J145859.6+431113 WD* 14 58 59.6055286896 +43 11 13.266286224           DA 6 0
51 GALEX J151027.7+412520 WD* 15 10 27.69 +41 25 18.9           DA 3 0
52 SDSS J152905.82+330520.4 WD* 15 29 05.8256764584 +33 05 20.370695280           DA 8 0
53 GALEX J155708.5+282336 WD* 15 57 08.4830623752 +28 23 36.057237324           DA 26 0
54 GALEX J162542.1+363218 WD* 16 25 42.1085895240 +36 32 19.082515344           DA 22 0
55 SDSS J163030.58+423305.7 WD* 16 30 30.5861975760 +42 33 05.778895032   19.2   19.3   DA 34 0
56 PSR J1713+0747 Psr 17 13 49.5367813 +07 47 37.450240           ~ 530 1
57 GD 362 WD* 17 31 34.3168718112 +37 05 20.711767812   16.3   16.4   DAZB 200 0
58 X Sgr X-4 LXB 18 23 40.57 -30 21 40.6   19.06 18.81     ~ 1056 1
59 PSR B1855+09 Psr 18 57 36.390620 +09 43 17.20712           DA 569 1
60 PSR J1909-3744 Psr 19 09 47.42820 -37 44 14.7740           ~ 343 2
61 PSR J1910-5959A Psr 19 11 42.7562 -59 58 26.900 22.02 22.13 22.03     DA5 99 1
62 HD 188112 HS* 19 54 31.4191828536 -28 20 20.679710640   10.01 10.22     sdB 101 0
63 GALEX J204949.7+000547 ** 20 49 49.7808007464 +00 05 47.343935076           DA+M 9 0
64 LP 400-22 ** 22 36 30.0130703280 +22 32 23.662277484   17.5   17.1   DA+DA 45 1
65 GALEX J225242.2-005626 WD* 22 52 42.2588149296 -00 56 26.720974968           DA 21 0

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