2011ApJ...730...67B

Query : 2011ApJ...730...67B

2011ApJ...730...67B - Astrophys. J., 730, 67 (2011/April-1)

The binary fraction of low-mass white dwarfs.

BROWN J.M., KILIC M., BROWN W.R. and KENYON S.J.

Abstract (from CDS):

We describe spectroscopic observations of 21 low-mass ( ≤ 0.45 M☉) white dwarfs (WDs) from the Palomar-Green survey obtained over four years. We use both radial velocities and infrared photometry to identify binary systems, and find that the fraction of single, low-mass WDs is ≤ 30%. We discuss the potential formation channels for these single stars including binary mergers of lower-mass objects. However, binary mergers are not likely to explain the observed number of single low-mass WDs. Thus, additional formation channels, such as enhanced mass loss due to winds or interactions with substellar companions, are likely.

Abstract Copyright: ∼

Journal keyword(s): stars: evolution - stars: low-mass - white dwarfs

VizieR on-line data: <Available at CDS (J/ApJ/730/67): table1.dat table2.dat table4.dat>

Simbad objects: 31

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Number of rows : 31
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 PG 0132+254 WD* 01 35 14.5278728496 +25 39 45.217045548   15.88 16.12     DA2.4 17 0
2 PG 0237+242 WD* 02 40 28.4343314856 +24 22 10.604132436   16.12 16.71     DA.7 15 0
3 PG 0808+595 WD* 08 12 13.0020011184 +59 23 47.191684092   16.00 16.01     DA1.8 21 0
4 PG 0834+501 WD* 08 37 37.3382291952 +49 52 27.883471980   15.054 15.323 15.761   DAO.8 35 0
5 Ton 353 WD* 08 49 05.8759911240 +24 45 07.922848896   16.40 16.71     DAO.7 33 0
6 Ton 1080 WD* 09 37 08.6067973416 +33 34 04.681249860   16.5 16.35     DA2.0 32 0
7 LAWD 32 WD* 09 46 39.0735844152 +43 54 52.233579756   13.39   13.8   DA3.8 109 0
8 PG 1022+050 WD* 10 24 59.8281525960 +04 46 10.445657952   14.37 14.20 14.2   DA3.5 60 0
9 PG 1036+086 WD* 10 39 07.3787750808 +08 18 41.006097360   16.07 16.26 16.2   DA2.2 32 0
10 Ton 1323 WD* 11 04 32.5723321080 +36 10 48.873021996   14.76 14.49     DA3.7 75 0
11 PG 1114+224 WD* 11 17 03.6094749408 +22 06 31.858615368   15.83 16.32     DA1.9 28 0
12 Feige 55 WD* 12 04 38.5359546168 +60 32 08.086967232 11.974 13.224 13.568 13.717 13.896 DAO.9 84 0
13 PG 1210+141 WD* 12 12 33.8813053392 +13 46 24.901146300   14.38 14.71 14.9   DA1.6 28 1
14 Ton 617 WD* 12 26 30.8730979008 +30 38 52.652529600   16.099 16.05     DA+M3 68 0
15 PG 1229-013 WD* 12 31 34.5018809808 -01 32 08.523532428   14.44 13.79 14.5   DA2.5 47 0
16 PG 1241-010 WD* 12 44 28.5731497128 -01 18 57.854663568   13.86 14.00 14.3   DA2.1 63 0
17 GD 150 WD* 12 52 17.1458812728 +15 44 43.466109396   14.36 14.63 14.9   DA1.9 43 0
18 HZ 34 WD* 12 55 14.6823782377 +37 32 29.666871272   15.510 15.690 16.070   DAO.6 72 1
19 EGGR 188 WD* 13 19 13.7224549014 +45 05 09.802760414   14.16   14.3   DA3.6 65 0
20 PG 1320+645 WD* 13 22 32.1388963560 +64 15 45.761174352   16.24 16.38     DA1.8 32 0
21 Feige 93 XB* 14 17 40.2189155424 +13 01 48.585467568   15.08 15.29     DA1+dM 57 0
22 PG 1458+172 ** 15 00 19.3370621352 +16 59 14.493026580   16.200 16.262 16.212   DA5+dM 25 0
23 PG 1519+500 WD* 15 20 41.9645059656 +49 51 40.890294720   16.17 16.45     DA1.7 34 0
24 PG 1554+262 WD* 15 56 23.6046929760 +26 04 47.164336356   16.8 16.87 17.3   DA2.3 13 0
25 PG 1614+137 WD* 16 16 52.2976937880 +13 34 20.926222860   15.16 15.24 15.4   DA2.2 46 0
26 GD 515 WD* 16 54 29.0577769752 +63 39 21.175780860   15.5   15.9   DA3.2 42 0
27 Wolf 665 WD* 17 15 34.8628515360 +33 13 03.893898936   14.43   14.7   DA2.2 76 0
28 NGC 6791 OpC 19 20 52.8 +37 46 40   10.52 9.5     ~ 1120 0
29 GD 236 WD* 22 29 08.5720633704 +06 22 47.494685532   15.5   14.3   DA3.1 46 0
30 PG 2257+162 WD* 22 59 46.8549184968 +16 29 16.948956336   16.00 16.14 16.0   DA2.0 32 0
31 GD 251 WD* 23 34 20.8686492840 +29 18 37.193293476 14.560 15.563 15.745 15.813 15.981 DA1.8 52 1

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