2013A&A...557A..19A


Query : 2013A&A...557A..19A

2013A&A...557A..19A - Astronomy and Astrophysics, volume 557A, 19-19 (2013/9-1)

New evolutionary sequences for extremely low-mass white dwarfs. Homogeneous mass and age determinations and asteroseismic prospects.

ALTHAUS L.G., MILLER BERTOLAMI M.M. and CORSICO A.H.

Abstract (from CDS):

The number of detected extremely low-mass (ELM) white dwarf stars has increased drastically in recent years, thanks to the results of many surveys. In addition, some of these stars have been found to exhibit pulsations, making them potential targets for asteroseismology. We provide a fine and homogeneous grid of evolutionary sequences for helium (He) core white dwarfs for the whole range of their expected masses (0.15≲M*/M≲0.45), including the mass range for ELM white dwarfs (M*/M≲0.20). The grid is appropriate for mass and age determination of these stars, as well as for studying their adiatabic pulsational properties. White dwarf sequences have been computed by performing full evolutionary calculations that consider the main energy sources and processes of chemical abundance changes during white dwarf evolution. Realistic initial models for the evolving white dwarfs have been obtained by computing the nonconservative evolution of a binary system consisting of an initially 1M ZAMS star and a 1.4M neutron star for various initial orbital periods. To derive cooling ages and masses for He-core white dwarfs, we perform a least square fitting of the M(Teff, g) and Age(Teff, g) relations provided by our sequences by using a scheme that takes into account the time spent by models in different regions of the Teff-g plane. This is particularly useful when multiple solutions for cooling age and mass determinations are possible in the case of CNO-flashing sequences. We also explore in a preliminary way the adiabatic pulsational properties of models near the critical mass for the development of CNO flashes (∼0.2M). This is motivated by the discovery of pulsating white dwarfs with stellar masses near this threshold value. We obtain reliable and homogeneous mass and cooling age determinations for 58 very low-mass white dwarfs, including three pulsating stars. Also, we find substantial differences in the period spacing distributions of g-modes for models with stellar masses near ∼0.2M, which could be used as a seismic tool to distinguish stars that have undergone CNO flashes in their early cooling phase from those that have not. Finally, for an easy application of our results, we provide a reduced grid of values useful to obtain the masses and ages of He-core white dwarfs.

Abstract Copyright:

Journal keyword(s): white dwarfs - binaries: general - stars: evolution - stars: oscillations - stars: interiors

VizieR on-line data: <Available at CDS (J/A+A/557/A19): elm.dat>

CDS comments: V209 omega Cen = Cl* NGC 5139 Saw V209

Simbad objects: 59

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Number of rows : 59
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 SDSS J005648.23-061141.5 WD* 00 56 48.2217929184 -06 11 41.557821792   17.2   17.6   D 10 0
2 SDSS J010657.39-100003.3 HS* 01 06 57.4035165312 -10 00 03.303934740   19.5   19.5   sdB 25 1
3 SDSS J011210.25+183503.8 WD* 01 12 10.2534117096 +18 35 03.827993856   17.0   17.5   DA 17 0
4 SDSS J015213.77+074913.9 WD* 01 52 13.7776613904 +07 49 14.106768816           DA 11 0
5 PSR J0218+42 Psr 02 18 06.3604 +42 32 17.365           ~ 316 2
6 1SWASP J024743.37-251549.2 EB* 02 47 43.37 -25 15 49.2           ~ 40 1
7 LP 413-40 WD* 03 45 16.8306937296 +17 48 08.702047980   17.1   16.3   DA 67 0
8 SDSS J065133.34+284423.4 WD* 06 51 33.3404753832 +28 44 23.448959772           DAH 73 0
9 SDSS J075141.17-014120.9 WD* 07 51 41.1768601008 -01 41 20.957784072   17.4   17.4   D 25 0
10 SDSS J075519.48+480034.0 WD* 07 55 19.4755767912 +48 00 34.060709988           DA 15 0
11 SDSS J075552.40+490627.9 WD* 07 55 52.4084306208 +49 06 27.943481232   20.8       DA 15 0
12 SDSS J080250.13-095549.8 WD* 08 02 50.1368106408 -09 55 49.832443848   19.1   19.4   D 8 0
13 SDSS J081133.56+022556.7 WD* 08 11 33.5581506048 +02 25 56.750675124           D 12 0
14 SDSS J081544.24+230904.9 WD* 08 15 44.2428837840 +23 09 05.055656148   18.7   18.6   DA 14 0
15 SDSS J081822.33+353618.8 WD* 08 18 22.3396737192 +35 36 18.922231116   20.8   19.9   DA 16 0
16 SDSS J082212.57+275307.4 WD* 08 22 12.5767704408 +27 53 07.503424512           DA 27 0
17 SDSS J084037.57+152704.5 WD* 08 40 37.5714527184 +15 27 04.556730564   19.9   19.6   D 8 0
18 SDSS J084910.13+044528.7 WD* 08 49 10.1295863640 +04 45 28.707340572   19.0   19.5   DA 27 0
19 SDSS J091709.55+463821.8 WD* 09 17 09.5538167784 +46 38 21.666153876           DA 34 0
20 CBS 6 WD* 09 23 45.6023056776 +30 28 05.083240368   16       DA2.7 37 0
21 PSR J1012+5307 Psr 10 12 33.4345449600 +53 07 02.548542576     19.5     DA 336 1
22 2QZ J104607.8-015359 WD* 10 46 07.8703094256 -01 53 58.454915640   18.0   18.5   DA 8 0
23 SDSS J105353.89+520031.0 WD* 10 53 53.9102986512 +52 00 31.033370736           DA 30 0
24 HS 1102+0934 WD* 11 04 36.7495773072 +09 18 22.842050364   16.9   16.5   DA 19 0
25 SDSS J111215.82+111745.0 WD* 11 12 15.8349560304 +11 17 45.120382836   16.54 16.31 16.2   DA 27 0
26 SDSS J114155.56+385003.0 WD* 11 41 55.5597679320 +38 50 03.088472928           D 16 0
27 SDSS J115138.37+585853.2 WD* 11 51 38.3886635472 +58 58 53.378412132   20.4       D 7 0
28 SDSS J115734.45+054645.4 WD* 11 57 34.4574153336 +05 46 45.560960292   19.9   19.9   D 11 0
29 SDSS J123316.19+160204.6 WD* 12 33 16.1976126360 +16 02 04.725298968   20.4   19.6   DA 15 0
30 SDSS J123410.37-022802.9 WD* 12 34 10.3676638032 -02 28 02.806799988   17.7   18.4   DA 35 0
31 SDSS J123800.09+194631.4 WD* 12 38 00.1052275056 +19 46 31.626561432           D 16 0
32 [MLF2014] 337529 RR* 13 26 17.2590081384 -47 23 17.168879292 16.915 16.721 16.578 16.566 16.364 ~ 20 0
33 SDSS J142200.73+435253.1 WD* 14 22 00.7422058440 +43 52 53.029934508           DA 13 0
34 SBSS 1434+503 WD* 14 36 33.2892435360 +50 10 26.924868192   18.0       DA 32 0
35 SDSS J143948.40+100221.7 WD* 14 39 48.4027117656 +10 02 21.732994284   19.0   18.5   DA 13 0
36 SDSS J144342.74+150938.6 WD* 14 43 42.7569449112 +15 09 38.945662092   18.5   18.6   DA 15 0
37 SDSS J144801.12+134232.8 WD* 14 48 01.1219546280 +13 42 32.772038544           DA 12 0
38 SDSS J151225.69+261538.4 WD* 15 12 25.6998135816 +26 15 38.475138564   20.1   19.9   DA 13 0
39 SDSS J151826.68+065813.2 WD* 15 18 26.6907090120 +06 58 13.261800468           DA 25 0
40 SDSS J153844.22+025209.4 WD* 15 38 44.2208518056 +02 52 09.581478636   18.4   19.0   D 8 0
41 SDSS J155708.48+282336.0 WD* 15 57 08.4830623752 +28 23 36.057237324           DA 16 0
42 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1758 0
43 [KTK97] V46 HS* 16 23 47.19 -26 31 56.5 18.85 18.85 18.58 18.39 18.16 sdB 20 0
44 SDSS J162542.10+363219.1 WD* 16 25 42.1085895240 +36 32 19.082515344           DA 19 0
45 SDSS J163026.09+271226.5 WD* 16 30 26.0939235024 +27 12 26.553728484   20.5   19.8   DA 12 0
46 GALEX J171708.5+675712 WD* 17 17 08.8568396016 +67 57 11.379229200   13.54 13.73 13.77   DAZ 26 0
47 SDSS J174140.49+652638.7 WD* 17 41 40.4935342416 +65 26 38.700436884   18.3   19.2   DA 20 0
48 SDSS J184037.78+642312.3 WD* 18 40 37.7911925616 +64 23 12.272542224   18.6   19.4   DA 31 0
49 PSR J1910-5959A Psr 19 11 42.7562 -59 58 26.900 22.02 22.13 22.03     DA5 82 1
50 KOI-964 EB* 19 13 59.8696461528 +47 59 47.244395688           ~ 46 0
51 KOI-1224 EB* 19 27 56.8751913744 +42 02 15.548977968           ~ 33 0
52 KOI-81 EB* 19 35 08.5764186408 +45 01 06.455313660   11.51 11.32     B8V 49 0
53 2MASS J19365001+4201436 HS* 19 36 50.0156687112 +42 01 43.555361196           sdB+D 13 1
54 KOI-74 EB* 19 53 17.8104467976 +42 23 18.509696700   10.83 10.70 11.002   A1V 59 1
55 HD 188112 HS* 19 54 31.4191828536 -28 20 20.679710640   10.01 10.22     sdB 88 0
56 SDSS J211921.96-001825.8 WD* 21 19 21.9636760056 -00 18 25.833784356   20.0   20.2   DA 18 0
57 SDSS J213228.36+075428.2 WD* 21 32 28.3625599560 +07 54 28.271598012   18.1   17.0   D 10 0
58 LP 400-22 WD* 22 36 30.0130703280 +22 32 23.662277484   17.5   17.1   DA+DA 39 1
59 SDSS J233821.50-205222.7 WD* 23 38 21.4958534472 -20 52 22.838599020   20.4   19.7   D 8 0

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2022.05.25-01:41:03

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