2001A&A...365..491N


C.D.S. - SIMBAD4 rel 1.7 - 2020.08.09CEST08:12:13

2001A&A...365..491N - Astronomy and Astrophysics, volume 365, 491-507 (2001/1-3)

Population synthesis for double white dwarfs. I. Close detached systems.

NELEMANS G., YUNGELSON L.R., PORTEGIES ZWART S.F. and VERBUNT F.

Abstract (from CDS):

We model the population of double white dwarfs in the Galaxy and find a better agreement with observations compared to earlier studies, due to two modifications. The first is the treatment of the first phase of unstable mass transfer and the second the modelling of the cooling of the white dwarfs. A satisfactory agreement with observations of the local sample of white dwarfs is achieved if we assume that the initial binary fraction is ∼50% and that the lowest mass white dwarfs (M<0.3M) cool faster than the most recently published cooling models predict. With this model we find a Galactic birth rate of close double white dwarfs of 0.05yr–1, a birth rate of AM CVn systems of 0.005yr–1, a merger rate of pairs with a combined mass exceeding the Chandrasekhar limit (which may be progenitors of SNe Ia) of 0.003yr–1 and a formation rate of planetary nebulae of 1yr–1. We estimate the total number of double white dwarfs in the Galaxy as 2.5x108. In an observable sample with a limiting magnitude Vlim=15 we predict the presence of ∼855 white dwarfs of which ∼220 are close pairs. Of these 10 are double CO white dwarfs of which one has a combined mass exceeding the Chandrasekhar limit and will merge within a Hubble time.

Abstract Copyright:

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

Simbad objects: 25

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Number of rows : 25

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 PSR J0034-05 Psr 00 34 21.8281 -05 34 36.620           ~ 159 0
2 Feige 11 HS* 01 04 21.6744758331 +04 13 37.051396308 10.847 11.826 12.065 12.183 12.324 sdB2VIHe4 110 0
3 LAWD 10 WD* 01 37 59.3936600367 -04 59 44.670036387   13.20 12.83 12.8   DA+D1 165 0
4 GD 420 WD* 01 41 21.6192053869 +77 09 00.729828673   14.91   15.0   DA3.0 36 1
5 V* IQ Cam HS* 04 26 06.8650071405 +54 28 17.100742176 14.21 14.86 14.66     sdB 56 0
6 PG 0940+068 WD* 09 42 55.0397535559 +06 35 37.185711341   13.50 13.69 14.01   DA2: 21 0
7 WG 15 WD* 09 58 54.9416147649 -66 53 10.181253441   14.40 14.60     DA1.8 55 0
8 PG 1022+050 WD* 10 24 59.8259661630 +04 46 10.498562889   14.37 14.20 14.2   DA3.5 46 0
9 Feige 36 HS* 11 04 31.6441819696 +24 39 42.691859421   12.87 12.78     sdB 50 0
10 Ton 1323 WD* 11 04 32.5722911355 +36 10 48.873727889   14.76 14.49     DA3.7 60 0
11 Feige 55 WD* 12 04 38.5356512387 +60 32 08.086450892 11.974 13.224 13.568 13.717 13.896 DAO.9 74 0
12 PG 1204+451 WD* 12 06 47.5414819052 +44 49 54.412957480   14.61 14.37 13.9   DA2.1 34 0
13 PG 1241-010 WD* 12 44 28.5728314003 -01 18 57.853501507   13.86 14.00 14.3   DA2.1 47 0
14 EGGR 188 WD* 13 19 13.7222973484 +45 05 09.808706255   14.16   14.3   DA3.6 53 0
15 PG 1432+159 HS* 14 35 18.9439672422 +15 40 14.372230565   13.63       sdB 26 1
16 Ton 245 HS* 15 40 23.4584728304 +26 48 29.782790077   13.65 13.83     sdB 37 0
17 EGGR 576 WD* 17 05 30.9713933188 +48 03 10.272765889   13.87 13.80     DA3.6 40 1
18 PSR J1713+0447 Psr 17 13 49.53053 +07 47 37.5264           ~ 359 1
19 Wolf 665 WD* 17 15 34.8628491650 +33 13 03.893935756   14.43   14.7   DA2.2 60 0
20 Ross 137 WD* 18 27 13.0872422364 +04 03 46.792534528 13.383 13.981 13.889 13.928 13.958 DA+DC 71 0
21 PSR B1855+09 Psr 18 57 36.39161 +09 43 17.2322           DA 478 1
22 KPD 1930+2752 HS* 19 32 14.8086352823 +27 58 35.444970697 12.80 13.75 13.82     sdB 145 0
23 GD 231 WD* 20 35 13.8114634080 +18 59 21.701796029   15.30 15.34 16.2   DA2.6 44 1
24 GD 251 WD* 23 34 20.8685992298 +29 18 37.193228381 14.560 15.563 15.745 15.813 15.981 DA1.8 45 1
25 PG 2345+318 HS* 23 48 07.5062970948 +32 04 48.037660206   13.99 14.19 14.66   sdB 26 0

    Equat.    Gal    SGal    Ecl

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2020.08.09-08:12:13

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