2001ApJ...550..448O

Query : 2001ApJ...550..448O

2001ApJ...550..448O - Astrophys. J., 550, 448-456 (2001/March-3)

Observations of ultracool white dwarfs.

OPPENHEIMER B.R., SAUMON D., HODGKIN S.T., JAMESON R.F., HAMBLY N.C., CHABRIER G., FILIPPENKO A.V., COIL A.L. and BROWN M.E.

Abstract (from CDS):

We present new spectroscopic and photometric measurements of the white dwarfs LHS 3250 and WD 0346+246. Along with F351-50, these white dwarfs are the coolest ones known, all with effective temperatures below 4000 K. Their membership in the Galactic halo population is discussed, and detailed comparisons of all three objects with new atmosphere models are presented. The new models consider the effects of mixed H/He atmospheres and indicate that WD 0346+246 and F351-50 have predominantly helium atmospheres with only traces of hydrogen. LHS 3250 may be a double degenerate whose average radiative temperature is between 2000 and 4000 K, but the new models fail to explain this object.

Abstract Copyright: ∼

Journal keyword(s): Stars: Fundamental Parameters - stars: individual (LHS 3250, WD 0346+246) - Stars: White Dwarfs

Simbad objects: 20

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Number of rows : 20
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 EGGR 246 WD* 00 41 26.0270023159 -22 21 02.292155084   15.25 14.60 14.088 13.671 DQ9 120 0
2 [IIB2000] F351-50 WD* 00 45 17.796 -33 29 10.81     19.37 18.25   DA 29 0
3 [HSH97] WD 0346+246 WD* 03 46 46.5167876352 +24 56 02.665383264   20.13 19.04 18.18   DC 71 1
4 HD 84937 Pe* 09 48 56.0992891997 +13 44 39.326709913 8.49 8.68 8.32 7.97 7.70 F8Vm-5 831 0
5 Ruiz 439-26 WD* 11 39 03.1039070557 -28 52 16.629435604     20.64 19.71   DC 37 1
6 LP 70-238 WD* 16 54 01.2602291775 +62 53 54.901854552   17.7       DC9 71 1
7 LP 686-32 WD* 16 58 47.0272554558 -06 17 08.936465962   17.2 16.8 16.6   DC9: 23 0
8 BD+63 1349 * 17 23 03.1388571168 +63 06 38.769486192   10.15 9.60     F8 10 0
9 GSC 00447-00192 * 18 42 59.2926733896 +00 31 09.146977680 14.781 14.044 13.004 12.397 11.717 ~ 8 0
10 2MASS J18430250+0030569 Y*? 18 43 02.5065772584 +00 30 56.798421840 15.628 15.248 14.196 13.590 12.993 ~ 7 0
11 SA 110-499 * 18 43 07.6616255640 +00 28 01.482501432 13.363 12.724 11.737 11.137 10.464 B9 17 0
12 SA 110-502 * 18 43 10.1099117376 +00 27 42.341011020 16.982 14.656 12.330 10.957 9.705 ~ 12 0
13 TYC 447-387-1 * 18 43 11.6970416904 +00 29 42.979005384 12.950 12.444 11.773 11.400 10.965 A0 21 0
14 SA 110-504 * 18 43 11.7110072187 +00 30 04.545001029 16.593 15.28 14.00 13.61 12.540 ~ 9 0
15 SA 110-506 * 18 43 18.9251365632 +00 30 27.167821488 11.939 11.880 11.312 10.977 10.660 F5 15 0
16 SA 110-507 * 18 43 19.1250687600 +00 29 26.008325232 14.411 13.581 12.440 11.807 11.234 ~ 15 0
17 TYC 511-2229-1 * 20 42 14.5845398760 +00 08 59.684591904 11.888 11.878 11.424 11.151 10.877 F5 16 0
18 TYC 511-2110-1 * 20 42 26.3877803016 +00 07 42.508077600 12.602 12.627 12.095 11.778 11.456 F8 15 0
19 BD-00 4073 * 20 42 35.4256593792 +00 07 20.230857624 12.409 11.115 9.905 9.257 8.688 K2 25 0
20 EGGR 555 WD* 23 19 09.5180510356 -06 12 49.960884664   19.47 18.22     DC9 51 0

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