2016MNRAS.463.2756H

Query : 2016MNRAS.463.2756H

2016MNRAS.463.2756H - Mon. Not. R. Astron. Soc., 463, 2756-2767 (2016/December-2)

Hydrogen in hot subdwarfs formed by double helium white dwarf mergers.

HALL P.D. and JEFFERY C.S.

Abstract (from CDS):

Isolated hot subdwarfs might be formed by the merging of two helium-core white dwarfs. Before merging, helium-core white dwarfs have hydrogen-rich envelopes and some of this hydrogen may survive the merger. We calculate the mass of hydrogen that is present at the start of such mergers and, with the assumption that hydrogen is mixed throughout the disrupted white dwarf in the merger process, estimate how much can survive. We find a hydrogen mass of up to about 2 x 10–3 M☉ in merger remnants. We make model merger remnants that include the hydrogen mass appropriate to their total mass and compare their atmospheric parameters with a sample of apparently isolated hot subdwarfs, hydrogen-rich sdBs. The majority of these stars can be explained as the remnants of double helium white dwarf mergers.

Abstract Copyright: © 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): binaries: close - stars: evolution - subdwarfs - white dwarfs - white dwarfs

Simbad objects: 49

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Number of rows : 49
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 CD-38 222 HS* 00 42 58.3063027488 -38 07 37.291406772   10.19 10.26     sdB 67 0
2 JL 236 HS* 01 14 06.6944062536 -52 44 02.168480580   13.18 13.46     sdB 17 0
3 Ton S 290 HS* 02 56 22.9457786112 -30 06 59.120311644   13.514 13.743 14.203   sdB 12 0
4 EC 03263-6403 HS* 03 27 10.0604472936 -63 52 54.326750232 12.31 13.26 13.48     sdB 14 0
5 PHL 1548 HS* 03 29 07.4100448416 -11 42 20.449002024   12.5 12.7     sdOB 16 0
6 BPS CS 22190-0034 HS* 03 43 09.6214548216 -13 06 00.597681360 12.34 13.39 13.64 13.5   sdB 17 0
7 PG 0342+026 HS* 03 45 34.5760235952 +02 47 52.714095360   10.844 10.926 11.186   sdB3VIIHe4 51 0
8 LB 1695 HS* 03 48 30.8245641120 -50 30 04.813206192 12.41 13.36 13.57 13.84   sdB 12 0
9 CD-32 1567 HS* 04 01 05.3124586656 -32 23 46.025705904 10.03 11.02 11.24     sdB 20 0
10 HE 0447-3654 HS* 04 49 15.6277550808 -36 49 28.681694040 13.30 14.32 14.58     sdB 12 0
11 [CW83] 0512-08 HS* 05 14 43.9316872560 -08 48 06.372157464   10.97 11.34     sdO 33 0
12 EC 05217-3914 HS* 05 23 25.4710949784 -39 11 54.080470284 14.21 15.31 15.55 15.94   sdB 29 0
13 EC 05479-5818 HS* 05 48 45.3192430368 -58 17 24.362915064 11.81 12.852 13.039 13.322   sdB 14 0
14 KPD 0629-0016 HS* 06 31 53.8164813456 -00 19 13.080321372 14.12 14.98 14.94 15.18   sdB 34 1
15 PG 0909+164 HS* 09 12 07.2920816328 +16 13 20.453857752   13.88 13.851     sdO8VIIHe1 23 0
16 PG 0909+276 HS* 09 12 51.6607835328 +27 20 31.396804260   11.92 12.10 12.62   sdB0.5VIIHe19 48 1
17 V* DT Lyn HS* 09 14 55.3780066224 +45 23 41.396157600   14.92       sdBO 34 0
18 PG 0958-116 HS* 10 00 41.8235310624 -11 51 34.585561008   15.01 15.26     sdB 27 0
19 GD 108 HS* 10 00 47.2462375824 -07 33 30.773994012 12.406 13.349 13.563 13.662 13.781 sdB 150 1
20 GALEX J100559.1+224932 WD* 10 05 59.1154061304 +22 49 32.311886664           DA+DA 59 0
21 V* UY Sex HS* 10 50 02.8265487864 -00 00 36.879009588 12.063 13.184 13.474 13.606 13.769 sdO9VIIHe6 175 0
22 Feige 38 HS* 11 16 49.3630906272 +06 59 33.203109948   12.871 13.096 13.231   sdB1.5VIIHe3 40 1
23 PG 1219+534 HS* 12 21 29.0914917288 +53 04 36.796062144   12.41       sdB 90 1
24 EC 12234-2607 HS* 12 26 06.1906451568 -26 24 12.167938008   13.58 13.77     sdB 14 0
25 Feige 65 HS* 12 35 51.1437498960 +42 22 39.720230508   11.78 12.046     sdB2 72 1
26 PG 1303+097 HS* 13 06 03.8836777488 +09 24 31.268045124   14.34       sdB 24 0
27 EC 13047-3049 HS* 13 07 31.0220916312 -31 05 01.920479028   12.56 12.83     sdB 13 0
28 PG 1325+102 HS* 13 27 48.5600155368 +09 54 51.049107756   13.73 13.98 14.29   sdBO 60 1
29 EC 14248-2647 HS* 14 27 47.3778238176 -27 01 08.750052732   11.67 11.46     sdOB 15 0
30 PG 1505+074 HS* 15 08 21.0455212416 +07 13 14.851306956   12.00 11.92 12.95   sdB 19 0
31 PG 1616+144 HS* 16 18 23.0938386048 +14 16 12.892149840   13.48       sdB 22 0
32 PG 1653+131 HS* 16 55 42.8181034632 +13 01 48.511897788   14.18 14.42 14.57   sdB 20 0
33 PG 1710+490 HS* 17 12 18.7556895624 +48 58 35.782284900   12.56 13.03     sdB1.5VIIHe3 39 0
34 [CW83] 1758+36 HS* 18 00 18.8640522672 +36 28 56.335373724 10.04 11.17 11.39 11.38   sdB0 38 1
35 BD+48 2721 HS* 18 34 09.1968898200 +48 27 39.864764700   10.50 10.70     sdB4 27 0
36 2MASS J19090714+3756143 HS* 19 09 07.1451475032 +37 56 14.224028784           sdB 49 0
37 Kepler-70 HS* 19 45 25.4745687168 +41 05 33.882248544 13.80 14.71 14.87 15.43 15.72 sdB 81 1
38 EC 20106-5248 HS* 20 14 25.9484491032 -52 39 23.680127664 11.46 12.09 12.30     sdB 19 0
39 EC 20229-3716 HS* 20 26 13.7352932400 -37 06 29.835656208 10.22 11.11 11.33 11.828   sdB 12 0
40 [DP70] 58 HS* 21 07 31.6822897752 -40 05 47.832831564 11.39 12.63 12.85     sdB 15 0
41 PHL 44 HS* 21 35 13.3327203264 -13 33 22.555121148 11.77 12.86 13.16     sdB 23 0
42 PG 2205+023 HS* 22 08 00.6431350584 +02 33 43.529204628   13.96 14.10 14.32   sdB2VIIIpHe0 25 0
43 EC 22081-1916 HS* 22 10 52.8672227976 -19 01 49.632538512   12.82 12.94 13.30   sdB 19 0
44 Ton S 61 HS* 22 36 16.6338641856 -31 42 13.008803472   12.905 13.145 13.463   sdO 18 0
45 Balloon 90100001 HS* 23 15 21.4810390968 +29 05 01.433373360   11.90 12.30     sdB 98 0
46 Feige 109 HS* 23 17 26.8819938360 +07 52 04.910534364       14.166   sdB1.5VIIIpHe0 38 0
47 PG 2317+046 HS* 23 19 55.3509680256 +04 52 34.659100740 11.493 12.630 12.876 12.950 12.994 sdO8VIIHe1 39 0
48 CD-35 15910 HS* 23 44 22.0084841208 -34 27 00.387634032   10.71 11.00 11.255   sdBHe1 59 0
49 PG 2349+002 HS* 23 51 53.2310316864 +00 28 17.655587688 12.165 13.086 13.277 13.380 13.496 sdB2VIIHe0 30 0

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