2015MNRAS.449.3966G

Query : 2015MNRAS.449.3966G

2015MNRAS.449.3966G - Mon. Not. R. Astron. Soc., 449, 3966-3980 (2015/June-1)

Ultracool white dwarfs and the age of the Galactic disc.

GIANNINAS A., CURD B., THORSTENSEN J.R., KILIC M., BERGERON P., ANDREWS J.J., CANTON P. and AGUEROS M.A.

Abstract (from CDS):

We present parallax observations and a detailed model atmosphere analysis of 54 cool and ultracool (Teff < 4000 K) white dwarfs (WDs) in the solar neighbourhood. For the first time, a large number of cool and ultracool WDs have distance and tangential velocities measurements available. Our targets have distances ranging from 21 pc to >100 pc, and include five stars within 30 pc. Contrary to expectations, all but two of them have tangential velocities smaller than 150 km/s thus suggesting Galactic disc membership. The oldest WDs in this sample have WD cooling ages of 10 Gyr, providing a firm lower limit to the age of the thick disc population. Many of our targets have uncharacteristically large radii, indicating that they are low-mass WDs. It appears that we have detected the brighter population of cool and ultracool WDs near the Sun. The fainter population of ultracool CO-core WDs remain to be discovered in large numbers. The Large Synoptic Survey Telescope should find these elusive, more massive ultracool WDs in the solar neighbourhood.

Abstract Copyright: © 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2015)

Journal keyword(s): techniques: photometric - stars: atmospheres - stars: evolution - white dwarfs - Galaxy: disc

VizieR on-line data: <Available at CDS (J/MNRAS/449/3966): table1.dat table2.dat table3.dat table4.dat>

Simbad objects: 63

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Number of rows : 63
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 BD+13 99B WD* 00 45 21.8816184720 +14 20 45.366028368   20.2   18.5   DZA 24 0
2 SDSS J012102.99-003833.6 WD* 01 21 02.9735686248 -00 38 33.771323580           DC 10 0
3 LSPM J0146+1404 WD* 01 46 29.0165541624 +14 04 38.325628488   19.8   19.2   DC 13 0
4 LP 651-34 WD* 02 56 41.6233890571 -07 00 33.832803416     18.55     DC 12 0
5 SDSS J030144.09-004439.5 WD* 03 01 44.0713943881 -00 44 38.071507829           DC 14 0
6 SDSS J030924.87+002525.3 WD* 03 09 24.8758479984 +00 25 25.584383784           DC 17 0
7 SDSS J031049.53-011035.3 WD* 03 10 49.5415248912 -01 10 35.212187928           DC 9 0
8 [HSH97] WD 0346+246 WD* 03 46 46.5167876352 +24 56 02.665383264   20.13 19.04 18.18   DC 71 1
9 LSPM J0747+2438W WD* 07 47 21.5316663264 +24 38 47.879579184   19.5   18.5   DC 15 0
10 LSPM J0747+2438E WD* 07 47 23.4796713000 +24 38 23.889540120   18.4   18.2   DA 16 0
11 LP 207-50 WD* 07 53 13.2817719403 +42 30 01.689387287   18.0   16.8   DC 31 0
12 LP 366-38 WD* 08 04 40.6318654130 +22 39 49.680692854   19.0   17.5   DZ 22 0
13 LP 257-28 WD* 08 05 57.6707602770 +38 33 44.664010601   17.2   16.2   DC9 36 0
14 LSPM J0817+2822 WD* 08 17 51.5107190184 +28 22 03.714090852   20.2   18.3   DC 12 0
15 LP 258-8 WD* 08 21 08.1535846944 +37 27 38.635953552   19.4   18.4   DA 19 0
16 LP 124-32 WD* 08 25 19.7188639891 +50 49 20.145685117   20.1   18.2   DC 13 0
17 Ton 345 WD* 08 45 39.1819378488 +22 57 28.251061956   15.2 16.07     DB 89 0
18 SDSS J085443.33+350352.7 WD* 08 54 43.3581721104 +35 03 53.275220424   21.0 19.80 19.3   DC 16 0
19 LP 165-27 WD* 09 09 14.5827145920 +47 00 17.850385224   20.1   18.4   DC 14 0
20 LP 166-16 WD* 09 42 44.9882892888 +44 37 43.439191716   19.8   19.0   DC 13 0
21 SDSS J100103.42+390340.4 WD* 10 01 03.5003440530 +39 03 41.043364897   20.42 19.68     DC 17 0
22 SDSS J110217.48+411315.4 WD* 11 02 17.5223664478 +41 13 21.183965308           DC 26 0
23 LSR J1107+4855 WD* 11 07 31.5415830732 +48 55 23.213931354   20.8   18.7   DC 18 0
24 LP 612-27 WD* 11 15 36.9594775512 +00 33 17.115314184   17.9   17.0   DA 19 0
25 LP 169-12 WD* 11 17 08.5816333272 +50 10 34.138340112   19.5   18.4   DC 12 0
26 LSPM J1158+0004 WD* 11 58 14.5155935280 +00 04 58.512324612   19.34   18.1   DC 23 0
27 LP 554-23 WD* 12 03 28.6675330872 +04 26 53.264311584   17.9   17.6   DC 14 0
28 LP 64-426 WD* 12 04 39.5396507640 +62 22 16.552260804   19.8   18.4   DC 13 0
29 SDSS J121207.01+044012.0 WD* 12 12 07.0375791168 +04 40 12.091249272           DC 10 0
30 SDSS J123812.85+350249.1 WD* 12 38 12.9101255856 +35 02 49.731256356           DC 9 0
31 SDSS J125106.11+440303.0 WD* 12 51 06.1607127984 +44 03 03.085257672   20.5 20.18 20.3   DC 14 0
32 LP 219-63 WD* 13 45 32.9695715616 +42 00 43.664620824   17.9   16.4   DC 20 0
33 LP 498-66 WD* 13 49 02.2993528741 +11 55 13.531742924   18.6   17.4   DC9 28 0
34 LP 560-10 WD* 14 22 25.7525148648 +04 59 39.770752056   20.3   18.9   DC 13 0
35 LP 67-28 WD* 14 24 29.5146767664 +62 46 17.048772840   19.4   17.8   DA 15 0
36 LP 221-217 WD* 14 36 42.8456058552 +43 32 34.611550878   18.1   17.2   DC9 26 0
37 LSPM J1437+4151 WD* 14 37 18.1902019656 +41 51 51.717345264   19.7   18.4   DC 13 0
38 LSPM J1447+5427 WD* 14 47 01.9163046768 +54 27 44.453740968   20.4   18.8   DC 10 0
39 SDSS J145239.00+452238.3 WD* 14 52 39.0185914728 +45 22 38.085395412     19.68     DC 15 0
40 LSPM J1458+1146 WD* 14 58 48.5516058120 +11 46 56.101269432   18.9   17.5   DC 11 0
41 LP 176-60 WD* 15 34 51.1670637472 +46 49 48.768557268   19.2   17.8   DC?9 31 0
42 LP 563-43 PM* 15 47 44.5983474768 +05 23 59.179642800   17.8   16.6   ~ 3 0
43 LP 385-31 WD* 16 06 19.8702507840 +25 47 03.319125648   20.0   18.3   DZA 12 0
44 LSPM J1615+4449 WD* 16 15 44.6645172720 +44 49 42.799489788   20.5   18.6   DC 13 0
45 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1978 0
46 EGGR 542 WD* 16 32 42.2378586215 +24 26 56.374301223   20.3   18.9   DC 22 0
47 LP 70-238 WD* 16 54 01.2602291775 +62 53 54.901854552   17.7       DC9 71 1
48 LP 276-48 WD* 17 04 47.6885743104 +36 08 47.552494380   18.3   17.6   DC 17 0
49 LP 102-373 WD* 17 22 57.7761467008 +57 52 50.527119559   18.4   17.8   DC 16 0
50 LP 332-25 WD* 17 28 07.28400 +26 46 20.6004   18.4   17.8   DA 8 0
51 NGC 6397 GlC 17 40 42.09 -53 40 27.6     5.17     ~ 2103 0
52 * alf Lyr dS* 18 36 56.33635 +38 47 01.2802 0.03 0.03 0.03 0.07 0.10 A0V 2787 1
53 SDSS J204128.99-052027.7 WD* 20 41 28.9984117296 -05 20 27.734069760           DC 11 0
54 LSPM J2042+0031 WD* 20 42 59.2388630424 +00 31 56.980356240   20.7   19.6   DC 12 0
55 SDSS J204557.53-071003.5 WD* 20 45 57.5374555248 -07 10 03.391310136           DC 10 0
56 SDSS J211805.21-073729.1 WD* 21 18 05.2097386968 -07 37 28.987319892           DC 11 0
57 LSPM J2147+1127 WD* 21 47 25.1606585448 +11 27 56.280621924   19.5   16.6   DA 13 0
58 LSR J2222+1221 WD* 22 22 33.8200454823 +12 21 42.648703042   20.1   16.5   DC 14 0
59 SDSS J223954.07+001849.2 WD* 22 39 54.0793289606 +00 18 48.971903365           DC 5 0
60 SDSS J223954.12+001847.4 WD* 22 39 54.1262157624 +00 18 47.116274976   20.1   18.6   DC 11 0
61 LSPM J2242+0048 WD* 22 42 06.1779800472 +00 48 22.931536572   20.1   18.7   DC 21 0
62 LSPM J2254+1323 WD* 22 54 08.6219130489 +13 23 57.360621752   19.7   18.1   DC 15 0
63 LSPM J2330+0028 WD* 23 30 55.1713973040 +00 28 52.002772464   19.8   19.1   DC 15 0

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