2011A&A...531A...7G


Query : 2011A&A...531A...7G

2011A&A...531A...7G - Astronomy and Astrophysics, volume 531A, 7-7 (2011/7-1)

Time evolution of high-energy emissions of low-mass stars . I. Age determination using stellar chronology with white dwarfs in wide binaries.

GARCES A., CATALAN S. and RIBAS I.

Abstract (from CDS):

Stellar ages are extremely difficult to determine and often subject to large uncertainties, especially for field low-mass stars. We plan to carry out a calibration of the decrease in high-energy emissions of low-mass GKM stars with time, and therefore precise age determination is a key ingredient. The overall goal of our research is to study the time evolution of these high-energy emissions as an essential input to studying exoplanetary atmospheres. We propose to determine stellar ages with a methodology based on wide binaries. We are interested in systems composed of a low-mass star and a white dwarf (WD), where the latter serves as a stellar chronometer for the system. We aim at obtaining reliable ages for a sample of late-type stars older than 1Gyr. We selected a sample of wide binaries composed by a DA type WD and a GKM companion. High signal-to-noise, low-resolution spectroscopic observations were obtained for most of the WD members of the sample. Atmospheric parameters were determined by fitting the spectroscopic data to appropiate WD models. The total ages of the systems were derived by using cooling sequences, an initial-final mass relationship and evolutionary tracks, to account for the progenitor life. The spectroscopic observations have allowed us to determine ages for the binary systems using WDs as cosmochronometers. We obtained reliable ages for 27 stars between 1 and 5Gyr, which is a range where age determination becomes difficult for field objects. Roughly half of these systems have cooling ages that contribute at least 30% the total age. We select those for further study since their age estimate should be less prone to systematic errors coming from the initial-final mass relationship. We have determined robust ages for a sizeable sample of GKM stars that can be subsequently used to study the time evolution of their emissions associated to stellar magnetic activity.

Abstract Copyright:

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

Simbad objects: 74

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Number of rows : 74
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 LP 705-30 PM* 00 26 00.2960313336 -10 37 00.186103632   14.6 12.90     K6 16 0
2 EGGR 166 WD* 00 26 02.2880266968 -10 37 51.863301444   16.58 16.22     DA4.8 34 0
3 BD+43 100 PM* 00 33 01.4119734072 +44 43 48.298498392       9.8   K0 26 1
4 BD+43 100B WD* 00 33 02.8475221080 +44 44 13.142887800   16.89   16.8   DA4.8 41 0
5 LP 587-53 WD* 01 23 14.7095497416 -02 09 27.226260504   17.5 17.48 17.0   DA 18 0
6 G 271-52 PM* 01 23 15.6791201976 -02 08 45.223723104   13.9 12.638 12.267   M1 9 0
7 LP 885-22 WD* 02 07 02.2964165568 -30 23 32.577786420     16.18     DA 16 0
8 LP 885-23 PM* 02 07 06.3478114272 -30 24 23.170008744   15.74 14.13 13.81 11.47 M0 13 0
9 BD+39 539 PM* 02 24 40.8326494296 +40 08 23.078652252       9.2   K2 20 0
10 BD+39 539B WD* 02 24 42.1928968416 +40 07 45.234042132   16.2   16.7   DA8.1 13 0
11 Cl Melotte 20 OpC 03 26 28 +48 58.5           ~ 798 0
12 LP 356-87 PM* 03 28 03.4011051600 +26 31 55.825569264   17.9 17.20 17.2   DA? 8 0
13 LP 356-88 PM* 03 28 03.7271496168 +26 31 51.953109312   14.84   12.4   M2.5 10 0
14 LP 888-63 LM* 03 28 48.4448358846 -27 19 04.603027055   15.6 13.80     M3 27 0
15 LAWD 14 WD* 03 28 48.7986016948 -27 19 00.096684530   14.0 13.56     DA5.4 70 1
16 Cl Melotte 22 OpC 03 46 24 +24 06.8           ~ 3207 0
17 LP 775-52 PM* 04 21 43.4523256467 -16 00 00.564466880   13.7 12.524 12.098 10.52 M2 7 0
18 LP 775-53 WD* 04 21 43.9842727082 -16 00 10.870192851   17.76 17.23 17.39   DA 8 0
19 Cl Melotte 25 OpC 04 29 47 +16 56.9           ~ 2860 0
20 HD 283750B WD* 04 36 44.8959324504 +27 09 51.523283628   16.46   15.4   DC8 87 1
21 HD 283750 BY* 04 36 48.2421502608 +27 07 55.888214520   9.354   7.4   K2.5Ve 264 2
22 G 86-1B WD* 05 21 43.4483694816 +33 21 58.784639328   16.9 16.10 16.7   DA5.5 35 0
23 G 86-1A ** 05 21 43.687776 +33 22 05.53116   15.80 14.32 13.82   dM3+dM3 13 0
24 LP 159-32 WD* 05 55 43.0330280924 +46 50 48.492660940   18.07   16.8   DA 22 0
25 LP 159-33 PM* 05 55 43.7674878962 +46 50 57.957406484   16.6   14.7   M5 18 0
26 G 107-69 PM* 07 30 42.7784278176 +48 11 58.588890241   15.21   13.0   M4V 57 0
27 EGGR 52 ** 07 30 47.30952 +48 10 26.6124 16.01 15.61   14.4   DA+DA 94 0
28 EGGR 58 WD* 08 20 01.3406920039 +38 34 35.521476253   16.94   16.4   DA6.5 48 0
29 G 111-72 PM* 08 20 04.2301179571 +38 34 41.116572920   14.70   12.736   M2 14 0
30 IC 2391 OpC 08 41 10 -52 59.5           ~ 774 0
31 G 161-36 WD* 09 29 21.2880206880 -04 10 05.699373096   14.94 14.79 15.34   DA3.6 24 0
32 G 161-37 PM* 09 29 21.5184625728 -04 10 23.544996168   16.7 15.41 15.29   M5 5 0
33 IC 2602 OpC 10 42 27 -64 25.6           ~ 619 0
34 NAME UMa Region reg 11 00 +50.0           ~ 322 0
35 EGGR 76 WD* 11 07 59.9504280373 -05 09 26.034289695 12.397 13.093 13.057 13.141 13.215 DA3 146 0
36 L 970-27 PM* 11 08 06.5391855920 -05 13 47.135439598 15.253 14.058 12.559 11.479 10.125 M3V 52 0
37 G 148-6 PM* 11 45 55.9724146573 +31 49 30.929010937       13.694   M3V 15 0
38 EGGR 185 WD* 11 45 56.6703793780 +31 49 30.692869763   13.66 13.60 14.0   DA3.1 68 1
39 G 121-21 PM* 11 50 17.5887658493 +25 18 21.454504713   16.96   14.3   M2V:e 15 0
40 LAWD 38 WD* 11 50 20.1723452944 +25 18 32.765299925   15.78   15.4   DA5 56 0
41 LP 129-586 PM* 11 51 23.4996757848 +54 11 12.668779104   17.4   15.3   ~ 32 0
42 LP 129-587 WD* 11 51 23.9947103976 +54 11 47.782832928   16.8   16.4   DA5.1 42 0
43 HD 106092 PM* 12 12 22.7351186004 -06 21 34.543627021   10.96 10.14 9.991   K3/4:V 46 0
44 LP 674-29 WD* 12 12 36.0524077285 -06 22 17.650110646     17.26 16.711   DA 22 0
45 NAME Ursa Major Moving Group MGr 12 32 +57.0           ~ 410 2
46 PG 1240+754 WD* 12 42 02.1350279952 +75 08 45.510927612   16.6 15.50 16.4   DA2.6 24 0
47 G 255-B18B PM* 12 42 03.4191553560 +75 08 41.870707260   18.0 16.89 13.1   M6 6 0
48 G 59-39 PM* 12 47 13.4303536179 +14 42 14.040866558   14.95   12.3   M0 12 0
49 EGGR 92 WD* 12 47 14.7133704150 +14 42 30.875986658   16.08   15.9   DA4.6 54 0
50 * bet Com PM* 13 11 52.3938268062 +27 52 41.462309460 4.92 4.84 4.25 3.77 3.47 F9.5V 872 0
51 LAWD 53 WD* 13 51 22.6873041720 -27 33 57.820912668   15.05 15.00 15.37 15.13 DA5.0 32 0
52 L 619-49 PM* 13 51 23.2289986344 -27 33 52.440716808   13.30 12.531 12.077 10.12 M3V: 16 0
53 NAME Proxima Centauri Er* 14 29 42.9461331854 -62 40 46.164680672 14.21 12.95 11.13 9.45 7.41 M5.5Ve 1142 0
54 * alf Cen B PM* 14 39 35.06311 -60 50 15.0992 2.89 2.21 1.33     K1V 966 1
55 * alf Cen A SB* 14 39 36.49400 -60 50 02.3737 0.96 0.72 0.01     G2V 1208 0
56 EGGR 112 WD* 15 11 51.3667790899 +56 24 50.544290269   16.47   16.1   DA5.4 45 0
57 G 201-40 PM* 15 11 53.5917311602 +56 24 52.042492022   17.30   14.4   M4 10 0
58 G 240-46 PM* 17 09 52.1978652744 +68 20 01.848467436       10.9   K7 15 0
59 EGGR 369 WD* 17 09 57.3242767104 +68 20 00.994636608   17.6   17.1   DA7.6 32 0
60 Wolf 672 A WD* 17 18 35.1636500684 +01 56 53.203775107       14.63   DA3.7 78 0
61 Wolf 672 B PM* 17 18 35.7308021334 +01 56 43.184997871     14.05 13.671   M4 31 0
62 * 16 Cyg A ** 19 41 48.9534996168 +50 31 30.219536784 6.79 6.59 5.95 5.50 5.17 G1.5Vb 717 1
63 HD 191408 PM* 20 11 11.9387690214 -36 06 04.351725607   5.44 5.32     K2.5V 252 1
64 HD 191408B PM* 20 11 12.2 -36 06 09           M3.5 225 1
65 HD 216777B WD* 22 55 49.4725742919 -07 50 02.387855249   16.92 16.50     DA7.4 71 0
66 HD 216777 PM* 22 55 49.9773604202 -07 49 21.386964536 8.73 8.65 8.01 7.47 7.10 G6V 147 0
67 LP 522-34 WD* 23 20 31.3017695952 +12 58 14.589261228   15.9   16.1   DA3.6 24 0
68 LP 522-35 PM* 23 20 33.1677298176 +12 58 37.125827148   17.2   15.7   M5V: 7 0
69 LAWD 93 WD* 23 43 50.7212145360 +32 32 46.728318300   13.06 12.94 13.12   DA3.8 139 0
70 G 130-6 ** 23 43 53.1084 +32 35 38.751   13.23   11.316   M1.5V 51 0
71 EGGR 405 WD* 23 49 53.4642375816 +13 06 12.922792560   15.9   16.3   DA4.4 44 0
72 LP 523-57 PM* 23 49 53.672 +13 06 12.85   21.1   18.3   M8 4 0
73 LAWD 94 WD* 23 54 01.0726392457 -33 16 31.078214643   14.6 13.56     DA5.7 50 0
74 L 577-72 PM* 23 54 01.0827378389 -33 16 24.385440650       13.15 10.84 M4V 28 0

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2022.08.09-02:48:23

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