2001ApJS..133..413B


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.20CEST15:57:28

2001ApJS..133..413B - Astrophys. J., Suppl. Ser., 133, 413-449 (2001/April-0)

Photometric and spectroscopic analysis of cool white dwarfs with trigonometric parallax measurements.

BERGERON P., LEGGETT S.K. and RUIZ M.T.

Abstract (from CDS):

A detailed photometric and spectroscopic analysis of cool (Teff≲12,000 K) white dwarf stars is presented. The sample has been drawn from the Yale Parallax Catalog and from a proper motion survey in the southern hemisphere. Optical BVRI and infrared JHK photometry, as well as spectroscopy at Hα, have been secured for a sample of 152 white dwarfs. The discovery of seven new DA white dwarfs, two new DQ white dwarfs, one new magnetic white dwarf, and three weak magnetic white dwarf candidates, is reported. Our sample also identifies 19 known or suspected double degenerates. The photometric energy distributions, the Hα line profiles, and the trigonometric parallax measurements are combined and compared against the predictions of model atmosphere calculations to determine the effective temperature and the radius of each object in the sample and also to constrain the atmospheric composition. New evolutionary sequences with carbon/oxygen cores with thin and thick hydrogen layers are used to derive stellar masses and ages. The results are used to improve our understanding of the chemical evolution of cool white dwarfs. We confirm the existence of a range in effective temperature between ∼5000 and 6000 K where almost all white dwarfs have hydrogen-rich atmospheres. Our sample shows little evidence for mixed H/He white dwarfs, with the exception of two helium-rich DA stars, and four (possibly five) C2H white dwarfs which have been interpreted as having mixed H/He/C atmospheres. The observed sequence of DQ stars is found to terminate abruptly near 6500 K, below which they are believed to turn into C2H stars. True DC stars slightly above this temperature are found to exhibit hydrogen-like energy distributions despite the lack of Hα absorption features. The mean mass of our complete sample is 0.65 M with a dispersion of σ∼0.20 M. Attempts to interpret the chemical evolution of cool white dwarfs show the problem to be complex. Convective mixing is called upon to account for the increase of the non-DA to DA ratio below 12,000 K, as well as the reappearance of helium-rich stars below ∼5000 K. The possible presence of helium in cool DA stars, the existence of the non-DA gap, and the nature of the peculiar DC stars are also explained in terms of convective mixing, although our understanding of how this mechanism works needs to be revised in order to account for these observations. Given this chemical evolution uncertainty, it is not clear whether thick or thin hydrogen layer models should be used to determine cooling ages. The oldest object in our sample is ∼7.9 Gyr or ∼9.7 Gyr old depending on whether thin or thick hydrogen layer models are used, respectively.

Abstract Copyright:

Journal keyword(s): Stars: Abundances - Stars: Atmospheres - Stars: Evolution - Stars: Fundamental Parameters - Stars: White Dwarfs

VizieR on-line data: <Available at CDS (J/ApJS/133/413): table1.dat table2.dat>

Simbad objects: 163

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Number of rows : 163

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 LAWD 1 WD* 00 02 40.0948011054 -34 13 39.593161221   15.36 14.94     DC 56 0
2 EGGR 381 WD* 00 12 14.7450558223 +50 25 20.735643555   14.6   14.2   DA7.6 81 0
3 Wolf 1 WD* 00 13 39.1507527874 +00 19 24.583485677   15.55   15.4   DA5.2 61 0
4 G 158-45 WD* 00 14 12.7919411584 -13 11 01.088388434   16.48 15.88     DC8H 46 0
5 LP 645-46 WD* 00 32 09.8584470150 -02 54 01.649572739   18.44 17.34     DA 19 0
6 LAWD 5 WD* 00 35 35.8380879443 +01 53 08.622736703   15.76 15.52 15.6   DA4.6 51 0
7 EGGR 245 WD* 00 41 22.0416293074 +55 50 08.350183996 13.30 14.11 14.05 14.3   DBQ5 47 0
8 EGGR 246 WD* 00 41 26.0270278030 -22 21 02.292485752   15.25 14.60 14.088 13.671 DQ9 97 0
9 Wolf 28 WD* 00 49 09.8984116191 +05 23 18.993107442 12.984 12.92 12.374 12.106 11.854 DZ7.5 216 0
10 EGGR 7 WD* 01 03 49.9233050217 +05 04 30.567630963   14.24   13.7   DA5.9 81 0
11 Wolf 1516 WD* 01 18 00.0750901676 +16 10 20.560876397   13.96   13.9   DC6 80 0
12 LP 707-61 WD* 01 19 32.0946858639 -14 15 26.767359472   17.85 16.97     DA 11 0
13 G 133-8 WD* 01 24 21.5702137093 +40 23 58.093250307   17.92   16.2   DA 24 0
14 Wolf 72 WD* 01 29 24.2590259126 +10 23 01.336988084   14.64   14.3   DA5.8 44 0
15 LAWD 10 WD* 01 37 59.3936600367 -04 59 44.670036387   13.20 12.83 12.8   DA+D1 162 0
16 EGGR 519 WD* 01 45 11.2278653644 +31 32 43.564430593   14.99   14.7   DA5.3 31 0
17 EGGR 467 WD* 01 48 09.1548351202 -17 12 14.412772867   17.4 17.66 17.3   DA6.9 33 0
18 EGGR 168 WD* 02 11 20.8420180006 +39 55 21.515685472   14.80 14.50 14.4   DAZ6.9 98 0
19 EGGR 16 WD* 02 16 58.0226863193 +42 58 05.238425388   16.96 16.23 16.3   DA9.5 54 0
20 LP 53-7 WD* 02 26 31.9639712339 +64 59 29.919446814   20.9 18.8 17.5   DC 15 0
21 EGGR 471 WD* 02 32 37.9055148805 -14 11 51.768182517   16.51 15.76     DC9 40 0
22 EGGR 565 WD* 02 46 30.8013439138 -02 27 23.459927248   16.34 15.38   15.09 DA7.4 54 0
23 EGGR 473 WD* 02 48 36.4289567406 +54 23 22.463731008   16.25   15.1   DAZ9 54 0
24 EGGR 476 WD* 02 59 59.1462565726 +08 11 56.431555495   16.33 15.90 15.3   DA7.8 40 0
25 LAWD 14 WD* 03 28 48.7985358267 -27 19 00.094462182   14.0 13.56     DA5.4 63 1
26 G 221-10 WD* 03 30 13.4197487350 +74 01 58.147683577   18.02 16.46 16.89   DC7 24 0
27 Wolf 219 WD* 03 44 34.8471576722 +18 26 09.821562185   15.50   14.8   DQ8 71 0
28 G 7-16 WD* 04 00 26.6831967555 +08 14 06.929570778   16.62   15.4   DC9 37 0
29 EGGR 180 WD* 04 31 12.5709459511 +58 58 41.292650735 12.29 12.77 11.19 12.8   DC5 108 0
30 HD 283750B WD* 04 36 44.8958962446 +27 09 51.523656552   16.46   15.4   DC8 81 1
31 EGGR 41 WD* 04 37 47.4072965475 -08 49 10.619748677   14.24 14.10     DQ8 71 0
32 EGGR 317 WD* 04 43 58.5620973420 +51 06 27.324836749   16.17 15.96 15.9   DA5.8 33 0
33 LP 777-1 WD* 05 05 52.4599016040 -17 22 43.483601200   16.71 15.97     DAH9 43 0
34 EGGR 43 WD* 05 21 43.4482546126 +33 21 58.785443370   16.9 16.10 16.7   DA5.5 33 0
35 EGGR 248 WD* 05 51 19.4817742053 -00 10 21.108157351   15.06 14.60     DQ8P 135 0
36 EGGR 45 WD* 05 55 09.5304147671 -04 10 07.066181242   15.49 14.45 13.994 13.538 DZ11 104 1
37 LP 159-32 WD* 05 55 43.0329621242 +46 50 48.491196615   18.07   16.8   DA 18 0
38 EGGR 290 WD* 05 56 25.462536 +05 21 48.29724   14.77 14.13 14.00   DA8P 140 0
39 G 105-30 WD* 06 20 47.7540497147 +06 45 17.123984060   15.9   15.8   DA8.5 32 0
40 EGGR 484 WD* 06 47 22.1509707051 +02 31 08.914171922   16.00   15.7   DA7.0 42 0
41 Ruiz 207-21 WD* 06 53 09.1588970402 -48 01 52.801014943   20.09 19.54     DC9 6 0
42 EGGR 342 WD* 06 53 26.6830610327 +64 03 42.045918806   17.21   16.1   DA8.4 24 0
43 G 108-42 WD* 06 57 22.8847119929 +02 41 00.837408936   16.28   16.0   DC5 20 0
44 EGGR 485 WD* 07 00 51.6637070997 +31 57 43.830040259   17.53   15.7   DC10 37 0
45 L 886-6 WD* 07 01 54.8387023337 -06 27 46.230286595   16.2 15.42     DA7.6 34 0
46 EGGR 51 WD* 07 10 14.3425453976 +37 40 19.472289712   15.94   15.4   DQ8 46 0
47 G 107-69 PM* 07 30 42.7784290757 +48 11 58.590735844   15.21   13.0   M4V 49 0
48 EGGR 52 ** 07 30 47.30952 +48 10 26.6124 16.01 15.61   14.4   DA+DA 92 0
49 LAWD 25 WD* 07 40 20.7887176053 -17 24 49.155097204   13.36 13.061 12.886 12.70 DAZ6 178 0
50 VB 3 WD* 07 45 38.4275766626 -33 55 51.339871042   17.40 16.70 16.21 15.23 DC10 33 0
51 EGGR 426 WD* 07 50 14.5843088905 +07 11 48.917586563   17.9   16.2   DC9 55 0
52 EGGR 427 WD* 07 50 15.3418491185 +07 11 37.097745148   17.6   16.1   DC9 53 0
53 LAWD 26 WD* 07 53 08.1440312543 -67 47 31.380600610   14.75 14.09     DA9.0 89 0
54 EGGR 345 WD* 07 55 25.9730001366 +36 21 55.078058343   16.33   15.9   DA6.4 41 0
55 G 193-78 WD* 07 56 01.2334650661 +57 41 59.816623839   15.16   14.9   DC5 31 0
56 EGGR 346 WD* 08 05 37.6487231197 +38 32 12.775978266   15.62   15.6   DZ 42 0
57 LP 257-28 WD* 08 05 57.6708030878 +38 33 44.664072227   17.2   16.2   DC9 22 0
58 EGGR 58 WD* 08 20 01.3408953781 +38 34 35.522429789   16.94   16.4   DA6.5 43 0
59 EGGR 249 WD* 08 30 39.4613081637 +32 41 47.231457515   16.02   15.3   DA6.8 44 0
60 CD-32 5613 WD* 08 41 32.4293043356 -32 56 32.916852010   12.07 11.85 12.3   DA5.5 257 0
61 Ton 368 WD* 08 59 14.7138104946 +32 57 12.158973329   15.18   14.9   DQ6 84 0
62 EGGR 250 WD* 09 15 56.0775328590 +53 25 23.858109696   14.09   14.1   DCP7 129 0
63 EGGR 64 WD* 09 16 40.7561121407 +43 59 41.591917131   15.56   15.3   DA5.8 55 0
64 Ton 17 WD* 09 33 41.0505352940 +29 11 23.317852917   16.14   15.8   DA6.0 42 0
65 EGGR 251 WD* 09 50 17.1411402623 +53 15 14.829387448   15.30   15.1   DQ6 48 0
66 EGGR 69 WD* 09 57 48.3484344551 +24 32 55.540903624   15.34 15.09 14.4   DA5.8 53 0
67 G 43-38 WD* 10 15 02.6098322336 +08 06 35.701494647   16.57   15.7   DA7.5 33 0
68 EGGR 350 WD* 10 23 09.0628707814 +63 27 41.489417026   15.09   14.6   DA7.3 53 0
69 V* CY Leo WD* 10 41 53.7793514475 +14 15 48.689654538   16.84   16.6   DC 45 0
70 BD-18 3019B WD* 10 45 39.0429501025 -19 06 45.026887039     15.5 15.75   DQ 41 0
71 LP 93-21 WD* 10 45 59.4243706995 +59 04 51.315440249   17.5   17.3   DQ8 37 0
72 LAWD 34 WD* 10 57 35.1342534985 -07 31 23.176742952 14.078 14.626 14.338 14.132 13.921 DA5n 70 0
73 LP 374-4 WD* 11 10 59.3410337280 +20 26 06.914827769   18.67   17.1   DC 24 0
74 LAWD 35 WD* 11 18 15.0640138225 -03 14 05.574900812   15.39 15.40     DC5 34 0
75 Ross 627 WD* 11 24 12.886176 +21 21 35.58204       14.28   DA6.8 108 0
76 Ruiz 439-80 WD* 11 27 09.2524670230 -29 40 11.198530827   15.02 15.02 14.8   DA5.3 35 1
77 EGGR 388 WD* 11 35 42.9361821448 +35 34 23.519914633   16.9   15.0   DC+M4.5Ve 34 0
78 Ruiz 439-26 WD* 11 39 03.1036679378 -28 52 16.627821186     20.64 19.71   DC 33 1
79 LAWD 37 WD* 11 45 42.9170659451 -64 50 29.464090822 11.08 11.725 11.513 11.34 11.163 DQ 224 0
80 LAWD 38 WD* 11 50 20.1723473719 +25 18 32.765371120   15.78   15.4   DA5 51 0
81 LAWD 39 WD* 11 56 43.8431675443 +18 22 19.544472322   15.84   15.6   DZ 33 1
82 G 197-47 WD* 12 11 29.2733579667 +57 24 17.243305492   16.34   15.3   DA8.6 45 0
83 LP 434-97 PM* 12 14 04.4108441385 +15 26 22.443511568   15.63   13.5   ~ 6 1
84 EGGR 89 WD* 12 17 32.9099940480 +32 05 13.522070238   17.33 16.95 13.9   DC7 29 0
85 WG 22 WD* 12 38 49.7813250074 -49 48 00.218655097   14.14 13.96     DA4.2 201 0
86 EGGR 92 WD* 12 47 14.7135859851 +14 42 30.877662929   16.08   15.9   DA4.6 51 0
87 EGGR 536 WD* 12 50 07.7349336447 +54 47 06.172029620   19.4   17.1   DC 38 0
88 EGGR 94 WD* 12 59 46.6566571330 +27 34 04.140165462   15.68   15.0   DAZ5.9 60 0
89 Wolf 457 WD* 13 00 09.0636207041 +03 28 41.063269863 16.356 16.452 15.808 15.429 15.044 DAQZ8 86 0
90 LP 322-800 WD* 13 03 17.8840526854 +26 03 13.514010854   20.01   18.6   DC9 21 0
91 NAME ER 8 WD* 13 12 56.4722068455 -47 28 07.911725081   18.45 17.11 16.32 15.72 DC 30 0
92 LP 797-33 WD* 13 16 19.5743319382 -20 07 32.058192492   18.09 17.14     DC9 14 0
93 EGGR 358 WD* 13 27 42.1661074733 +57 55 05.940478007   17.12   16.4   DA7.4 32 0
94 G 165-7 WD* 13 30 59.4185219799 +30 29 53.651634272   16.73 16.04 15.74 15.60 DZ7 62 0
95 Wolf 489 WD* 13 36 31.765416 +03 40 45.68628   15.66   14.48   DZ9 105 0
96 EGGR 360 WD* 13 47 24.3695836668 +10 21 38.011535761   15.49   14.8   DA7.1 80 0
97 EGGR 438 WD* 13 48 03.0103505073 +23 34 46.441933375   16.72   15.2   DC9 60 0
98 G 124-26 WD* 14 20 54.8134178972 -09 05 08.763878441   15.9 15.36 15.21 15.01 DA6.1 26 0
99 LP 801-9 WD* 14 47 25.3409061859 -17 42 15.753498264   17.42 16.46     DC10 34 0
100 EGGR 298 WD* 14 58 06.4884281478 +29 37 29.515415393   15.86   15.3   DA6.8 72 0
101 GD 175 WD* 15 05 49.3111249044 -07 14 40.949578128   16.27 15.89     DAH7.3 27 0
102 HD 140901B WD* 15 47 30.0208012719 -37 55 08.458405808   13.10 12.80 13.53 12.34 DA4.8 80 0
103 EGGR 116 WD* 16 08 22.1888382580 +42 05 43.437369514   13.91   13.7   DA3.8 36 0
104 EGGR 117 WD* 16 11 25.6063415264 +13 22 17.940004792   15.33   15.2   DA5.4 63 0
105 EGGR 327 WD* 16 27 53.4891069739 +09 12 16.023160179 16.008 16.475 16.117 15.899 15.683 DA6.9 86 0
106 Ross 640 WD* 16 28 25.0030292072 +36 46 15.849157470   14.01   13.9   DZA5.5 161 0
107 EGGR 258 WD* 16 34 21.5517343404 +57 10 08.867977330   15.49   14.9   DQ8 105 0
108 PG 1633+434 WD* 16 35 01.4290922778 +43 17 36.346161096   15.26   14.5   DAZ7.6 66 0
109 EGGR 259 WD* 16 37 40.6398380924 +13 40 36.511350106   17.31   16.4   DA7.5 27 0
110 EGGR 120 WD* 16 39 27.8216532682 +33 25 22.241769713   14.83   14.6   DA4.9 60 0
111 GD 356 WD* 16 40 57.1484593189 +53 41 09.319793049   15.39   15.1   DAEH6.5 100 0
112 EGGR 196 WD* 16 41 36.6061005916 +15 12 37.930204596   16.09   15.4   DA6.7 39 0
113 EGGR 197 WD* 16 57 09.8598913902 +21 26 48.662290058   14.32   14.1   DA5.4 77 0
114 LP 686-32 WD* 16 58 47.0274667246 -06 17 08.938021216   17.2 16.8 16.6   DC9: 12 0
115 EGGR 494 WD* 17 08 07.9651561007 +02 57 37.081611590   15.65   14.5   DZ7 50 0
116 LAWD 66 WD* 17 11 26.7617767287 -14 47 53.693770478   14.38 14.29 14.49   DQwk 35 0
117 Wolf 672 A WD* 17 18 35.1636102144 +01 56 53.205524371   14.44   14.1   DA3.7 72 0
118 LAWD 68 WD* 17 37 00.7205260620 -54 25 56.562001797   16.26 15.8 15.8   DAs 22 0
119 EGGR 371 WD* 17 38 41.6608613803 +05 16 07.664465890   16.32   15.8   DA5.6 37 0
120 EGGR 372 WD* 17 48 07.9929730558 +70 52 35.921195401   14.55   13.5   DQ9P 122 0
121 EGGR 199 WD* 17 49 50.1478625716 +82 46 26.063125383   14.92   14.5   DA6.8 76 0
122 EGGR 373 WD* 18 13 31.2097849542 +32 48 31.289559318   17.0   15.97   DA6.6 29 0
123 EGGR 330 WD* 18 13 35.4504776759 +32 48 43.782920893   17.6   16.7   DA8 31 0
124 G 141-2 WD* 18 20 30.885552 +12 39 18.82800   16.66 16.04 16.31   DA8 45 0
125 G 227-28 WD* 18 21 19.8311225380 +61 01 07.383714379   16.62   15.0   DA10 41 0
126 Ross 137 WD* 18 27 13.0872422364 +04 03 46.792534528 13.383 13.981 13.889 13.928 13.958 DA+DC 69 0
127 EGGR 126 WD* 18 29 09.8621857317 -04 29 35.487964512   14.82 14.57 14.74   DA5.4 44 0
128 EGGR 374 WD* 18 30 20.2712255845 +54 47 27.208980355   15.99   14.9   DQ7P 80 0
129 G 184-12 WD* 18 33 58.3489775524 +19 45 52.991307059   16.71   16.0   DQ6 19 0
130 GD 215 WD* 18 43 25.7232809319 +04 20 22.831033463   15.06 14.92 14.2   DA5.6 40 0
131 EGGR 127 WD* 18 57 30.1771893705 +33 57 25.775068391   14.81   14.8   DA4.1 71 0
132 LAWD 73 WD* 19 00 10.2534325163 +70 39 51.418372586   13.24   13.5   DAP4.5 215 0
133 EGGR 375 WD* 19 18 58.6308363300 +38 43 21.478033383   15.02   14.1   DC7 61 1
134 GD 219 WD* 19 21 40.4180173962 +14 40 41.402969332   13.07 13.01 13.3   DA3.3 66 0
135 LAWD 79 WD* 19 56 29.2263059604 -01 02 32.670599846   13.95 13.69     DA6.4 120 0
136 EGGR 498 WD* 20 05 34.8732754932 -10 56 54.433143158   17.91 16.89 16.4   DA10 46 0
137 G 24-9 WD* 20 13 55.6789301719 +06 42 44.826038006 15.733 16.176 15.751 15.476 15.248 DC7 82 0
138 G 187-8 WD* 20 50 20.6529415818 +26 30 40.764334567   16.53   14.1   DA9 40 0
139 Ross 193B WD* 20 56 47.7845338679 -04 50 39.540234404   17.81 16.68     DC10 61 0
140 EGGR 262 WD* 21 01 44.8123527712 +31 48 39.471263616 14.36 15.11   15.35   DQ5 43 0
141 EGGR 377 WD* 21 02 02.6728838322 +19 12 57.670809096   16.77   16.2   DA7.2 33 0
142 G 187-16 WD* 21 02 12.0659228815 +24 57 36.373721532   17.07   16.0   DA7.8 16 0
143 EGGR 581 WD* 21 10 50.0376184742 -21 29 22.522347028   17.44 16.77 16.36   DA9 16 0
144 LAWD 83 WD* 21 13 16.8542099131 -81 49 12.878202704 13.28 13.82 13.59 13.6   DA4.8 81 0
145 EGGR 447 WD* 21 13 45.9284218612 +26 21 33.267805254   14.94   14.9   DA5.8 39 0
146 EGGR 582 WD* 21 38 46.1926338680 +23 09 21.490041640   15.39   14.6   DA4.9 41 0
147 G 126-25 WD* 21 42 08.5321414909 +13 28 44.232680919   16.87   16.2   DA6.6 19 0
148 EGGR 148 WD* 21 42 41.0062978424 +20 59 58.123982478   13.40   12.9   DQ6 101 0
149 WG 39 WD* 21 57 38.3567407855 -51 00 31.522186463   14.94 14.73 14.53   DQ7 62 0
150 EGGR 302 WD* 22 09 47.1035859710 +14 29 47.126717817   15.93   15.5   DA6.6 48 0
151 EGGR 154 WD* 22 43 04.7716216978 -01 27 53.457883843   16.52 16.21 16.1   DA5.4 34 0
152 EGGR 155 WD* 22 49 05.5506899099 +22 36 31.990253835   14.55   13.8   DA4.7 89 0
153 EGGR 283 WD* 22 51 23.0233217603 +29 39 44.488016211   16.22   15.1   DA8.1 68 0
154 EGGR 453 WD* 22 53 53.3851195567 -06 46 54.488931649   17.53 15.66 15.70   DZ13 83 1
155 HD 216777B WD* 22 55 49.4724398931 -07 50 02.388597834   16.92 16.50     DA7.4 64 1
156 G 28-27 WD* 22 57 26.1170479343 +07 55 42.597100060   17.20   17.0   DAH 26 0
157 G 157-34 WD* 23 14 25.1849766115 -06 32 47.882911894 14.90 15.55 15.42     DC 36 0
158 EGGR 554 WD* 23 15 18.8071668249 -02 09 40.601534867   16.80 16.29     DZ 40 0
159 EGGR 555 WD* 23 19 09.5178020614 -06 12 49.963075930   19.47 18.22     DC9 39 0
160 EGGR 161 WD* 23 32 03.5210003680 +26 58 46.118132842   15.52   15.2   DAP4.2 40 0
161 Ruiz 292-43 WD* 23 48 16.7658801095 -44 28 11.756228973   18.66 17.87 17.5   DZ 9 0
162 EGGR 506 WD* 23 49 55.0276483315 +29 34 04.023513875   16.1 15.72 15.9   DA8.5 43 0
163 EGGR 507 WD* 23 54 56.2780505615 +40 27 29.540334906   15.28   15.0   DQ5 42 0

    Equat.    Gal    SGal    Ecl

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2019.10.20-15:57:28

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