2011ApJ...737...28B


C.D.S. - SIMBAD4 rel 1.7 - 2021.05.17CEST03:56:27

2011ApJ...737...28B - Astrophys. J., 737, 28 (2011/August-2)

A comprehensive spectroscopic analysis of DB white dwarfs.

BERGERON P., WESEMAEL F., DUFOUR P., BEAUCHAMP A., HUNTER C., SAFFER R.A., GIANNINAS A., RUIZ M.T., LIMOGES M.-M., DUFOUR P., FONTAINE G. and LIEBERT J.

Abstract (from CDS):

We present a detailed analysis of 108 helium-line (DB) white dwarfs based on model atmosphere fits to high signal-to-noise optical spectroscopy. We derive a mean mass of 0.67 M for our sample, with a dispersion of only 0.09 M. White dwarfs also showing hydrogen lines, the DBA stars, comprise 44% of our sample, and their mass distribution appears similar to that of DB stars. As in our previous investigation, we find no evidence for the existence of low-mass (M < 0.5 M) DB white dwarfs. We derive a luminosity function based on a subset of DB white dwarfs identified in the Palomar-Green Survey. We show that 20% of all white dwarfs in the temperature range of interest are DB stars, although the fraction drops to half this value above Teff∼ 20,000 K. We also show that the persistence of DB stars with no hydrogen features at low temperatures is difficult to reconcile with a scenario involving accretion from the interstellar medium, often invoked to account for the observed hydrogen abundances in DBA stars. We present evidence for the existence of two different evolutionary channels that produce DB white dwarfs: the standard model where DA stars are transformed into DB stars through the convective dilution of a thin hydrogen layer and a second channel where DB stars retain a helium atmosphere throughout their evolution. We finally demonstrate that the instability strip of pulsating V777 Her white dwarfs contains no non-variables, if the hydrogen content of these stars is properly accounted for.

Abstract Copyright:

Journal keyword(s): stars: abundances - stars: evolution - stars: fundamental parameters - stars: luminosity function, mass function - stars: oscillations - white dwarfs

Simbad objects: 120

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Number of rows : 120

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 EGGR 508 WD* 00 03 31.6264396671 -16 43 58.413337262   14.68 14.58 14.90   DB4 35 0
2 GD 408 WD* 00 05 06.8209062485 +73 13 09.384620400   14.27   14.4   DB4 66 0
3 Feige 4 WD* 00 20 01.8064725669 +13 52 47.959693177   15.10 15.22     DB3 57 0
4 KUV 00312-1837 WD* 00 33 40.9198481787 -18 20 32.364719554     16.66     DB 15 0
5 Feige 7 WD* 00 43 45.9804059124 -10 00 25.019673638   14.49       DBAP3 90 0
6 EGGR 513 WD* 01 03 24.5382564455 -06 32 10.897473656   13.92 13.91     DB3 43 0
7 EGGR 409 WD* 01 14 37.6542285316 +10 41 04.756788413   15.27 15.41 15.69   DB2.5 62 0
8 Ton S 217 WD* 01 27 44.5752998799 -23 24 48.427225764   15.34 15.38     DB5 28 0
9 PG 0129+247 WD* 01 32 24.0550562504 +24 56 13.031095481   16.5   17.0   DB4 13 0
10 Lan 150 WD* 02 15 34.7611710269 +64 53 20.589404481 15.5 17.8   17.0 17.5 DB2.5 6 0
11 WD 0214+699 WD* 02 19 06.4283829487 +70 08 38.365413599 15.5 16.6   16.6 17.1 DB2.5 8 0
12 KUV 02196+2816 WD* 02 22 28.3916234357 +28 30 07.715476930   17.0 18.16     DA+DB 13 0
13 Lan 142 WD* 02 28 49.9142754862 +68 35 37.035799073 16.5 17.6   18.0 18.3 DB3 6 0
14 KUV 02498-0515 WD* 02 52 15.5296119419 -05 02 32.365231560   16.7 16.60     DB 14 0
15 KUV 02499+3442 WD* 02 52 58.0585495800 +34 53 45.969719355   17.4 16.40 17.0   DB 11 0
16 GD 40 WD* 03 02 53.1038447765 -01 08 33.798642438   15.51 15.56     DBZ4 156 0
17 WD 0258+683 WD* 03 03 27.8958577039 +68 29 53.367862163 16.2 16.8   16.8 17.4 DBA3.5 6 0
18 WG 7 WD* 03 09 47.9177903982 -56 23 49.413047243   13.99 14.14 14.42   DB 45 0
19 Lan 174 WD* 03 41 16.9535699865 +62 42 01.968323666 16.1 17.1   17.2 17.6 DB2 6 0
20 KUV 03493+0131 WD* 03 51 51.6705799617 +01 39 47.124710308   16.33 16.29     DB 11 0
21 HE 0414-0434 WD* 04 16 52.6473990839 -04 27 23.913361806   14.6 15.7 15.4   DB 11 0
22 HE 0417-5357 WD* 04 19 09.9056755039 -53 50 45.306667562 14.15 15.17 15.26     DB 31 0
23 HE 0423-1434 PM* 04 25 51.7907121245 -14 27 52.521049752 15.39 16.33 16.39 16.6   DB/sdBHe 8 0
24 HE 0429-1651 ** 04 32 13.824072 -16 45 08.67132 14.83 15.76 15.41 15.35   DB+dM 8 0
25 GD 61 WD* 04 38 39.3737549429 +41 09 32.348595654 13.801 14.767 14.879 14.932 14.970 DBAZ3 83 0
26 EGGR 316 WD* 04 40 23.8781162638 +13 58 45.878140655   14.97 14.94 13.25   DB4 62 0
27 LP 891-12 WD* 04 45 17.3094006556 -27 26 23.370212982   15.6       DB4: 14 0
28 KUV 05034+1445 WD* 05 06 15.8216363547 +14 48 30.287118927   14.11 14.12 14.36   DB 17 0
29 KUV 05134+2605 WD* 05 16 27.7873053535 +26 08 37.542963369   16.5 16.70 16.6   DB 31 0
30 GD 435 PM* 05 24 58.9166922787 +77 14 14.495287466   16.00 16.20 15.56   DB?4 14 0
31 HD 39570B WD* 05 53 53.9103726764 +12 24 14.422516144   14.59 14.17 16.04   DC5 43 0
32 WG 8 WD* 06 16 14.2564336309 -59 12 27.408789310   14.00 14.09     DB3+ 54 0
33 GD 84 WD* 07 18 01.9005268754 +45 47 53.065352158   15.27   15.2   DBAZ?6 35 0
34 GD 85 WD* 07 19 59.4160611125 +40 21 22.128905076   14.83   15.2   DB3 33 0
35 CBS 73 WD* 08 28 29.1646846268 +36 34 18.989586472   17       DB 16 0
36 CSO 197 WD* 08 38 45.9852007895 +33 50 00.537990113   17.1 16.0 17.8   DB3 11 0
37 CBS 78 WD* 08 41 55.0263325421 +37 23 11.980371587   17 17     DBZ5 27 0
38 CBS 82 WD* 08 43 50.8546620006 +36 14 19.594726858   17 17     DB 18 0
39 Ton 10 WD* 08 43 59.3692943703 +26 02 56.591825267   14.68 14.78     DB3 33 0
40 LAWD 29 WD* 08 47 29.4298639651 -18 59 49.750228152 14.607 15.564 15.682 15.782 15.901 DB3 51 0
41 EGGR 904 WD* 08 56 18.9478068190 +16 11 03.745447923   15.78 15.81     DB2 47 1
42 PG 0900+142 WD* 09 03 31.2873682735 +14 00 49.169826080   16.48   16.0   DBA4 15 0
43 Ton 381 WD* 09 05 38.4640015736 +29 06 10.434014424   17.0       DB 16 0
44 CBS 94 WD* 09 09 29.2475509301 +33 58 14.882852407   17.3   18.4   DB 12 0
45 PG 0921+092 ** 09 23 55.2661082827 +08 57 17.465625617   16.3   16.6   DBA+M: 25 0
46 PG 0948+013 WD* 09 51 02.2292063165 +01 04 32.563027752   15.89 15.75 16.30 15.77 DB2 33 0
47 V* SW LMi WD* 09 57 49.4085937403 +33 59 23.693730968   17       DB 50 0
48 KUV 10064+4120 WD* 10 09 22.9330493678 +41 05 05.636983497   16.9 17.83 17.3   DB 15 0
49 KUV 10098+4138 WD* 10 12 49.6207834413 +41 23 11.084433712     16.33     DB 22 0
50 GD 303 WD* 10 14 37.0859600275 +56 48 32.693256307   15.5       DBZ4 45 0
51 PG 1026-057 WD* 10 29 02.0468176968 -05 54 27.791940144   16.4 16.94 16.32   DB3 9 0
52 Ton S 40 WD* 10 40 52.6137333735 +28 48 56.837055086   16.4   16.4   DB4 17 0
53 GD 124 WD* 10 48 32.6508230656 -02 01 11.123649386   15.74 15.77 15.81   DBZ5 41 0
54 Ton 1312 WD* 10 59 25.5213320659 +34 14 52.336785179   15.47   15.3   DB5 42 0
55 Ton S 573 WD* 11 09 59.8671275717 +26 18 47.221453877   15.82   15.9   DB4 39 0
56 PG 1115+166 WD* 11 17 55.1073902494 +16 21 29.254318197   15.16       DA+DB 38 0
57 V* DT Leo WD* 11 18 22.6933636487 +15 33 34.537492711   16.90   16.88   DB2 48 0
58 PG 1129+373 WD* 11 31 43.3669146688 +37 01 28.222271808   16.23       DB4 21 0
59 PG 1144-085 WD* 11 46 53.9805373316 -08 45 46.546273854   16.01 16.13 16.25   DB 10 0
60 KUV 11489+4052 WD* 11 51 30.7763268024 +40 34 55.454483074   16.9 17.33 17.4   DB 17 0
61 PG 1149-133 WD* 11 51 50.5965758144 -13 37 15.781184550   16.09       DB2 23 0
62 EC 12522-2855 WD* 12 54 55.1550552734 -29 11 53.676990046   15.82 15.85 15.9   DB 10 0
63 PG 1311+129 WD* 13 13 51.2700628961 +12 40 09.565563741   16.21 16.26     DBA 27 0
64 PG 1326-037 WD* 13 29 16.3943052086 -03 58 51.727738264     15.7     DB2 22 0
65 PG 1332+163 WD* 13 34 39.6366278437 +15 59 48.569737936   15.98       DBA 14 0
66 GD 325 WD* 13 36 01.8227186828 +48 28 46.250273892   13.91 13.98 14.42   DB4 62 0
67 PG 1336+124 WD* 13 39 13.5354175405 +12 08 31.225452704   14.41   14.6   DB3+ 27 0
68 V* EM UMa WD* 13 53 09.9689208528 +48 40 21.174312247   16.5   17.0   DB2 93 0
69 PG 1352+004 WD* 13 55 32.4133609926 +00 11 23.938814098   15.72       DB4 30 0
70 EGGR 272 WD* 14 06 19.9913460044 -01 19 32.402673912   15.75 15.80     DBA 41 0
71 PG 1411+219 WD* 14 13 29.8345889097 +21 37 39.881030330   14.4 14.38 14.58   DB4 18 0
72 PG 1415+234 WD* 14 17 55.3678007198 +23 11 36.708466997   16.5 16.8     DB3 17 0
73 KUV 14161+2255 WD* 14 18 25.8161943517 +22 41 32.670182937   16.7 16.9     DB 13 0
74 KUV 14197+2514 WD* 14 21 58.5415209911 +25 00 35.366221643     17.34     DA+DB 8 0
75 GD 335 WD* 14 22 04.2817363484 +34 54 57.955653405   16.0 16.0     DBA 28 0
76 PG 1421-011 WD* 14 24 29.1905829689 -01 22 16.502389311   15.97       DBAZ 9 0
77 G 200-39 WD* 14 27 36.1750086842 +53 48 28.004572700   14.86 14.99 15.35   DBAZ4 79 0
78 G 200-40 PM* 14 27 37.0736031321 +53 47 49.062219010   13.19 11.90 11.509   sdM 17 0
79 PG 1444-096 WD* 14 47 36.9900339997 -09 50 06.670429605   14.94 14.92 15.55   DB3 13 0
80 PG 1445+153 WD* 14 48 14.3733627274 +15 04 49.732230319   15.55 15.6     DB 29 0
81 EGGR 393 WD* 14 56 31.8408322730 +81 56 52.711395834   15.0   14.8   DB4 34 0
82 L 151-81 ** 14 58 11.714 -63 17 33.39   15.8   16.2   DB3+DA4 17 0
83 V* CW Boo WD* 14 58 32.6384748324 +10 08 18.107744303   15.89       DBA 51 0
84 PG 1540+681 WD* 15 40 38.2133443646 +67 56 13.851125246   16.2 16.44 16.1   DB3 13 0
85 GD 190 WD* 15 44 19.4544619130 +18 06 43.778576704 13.537 14.556 14.677 14.767 14.849 DB2 81 0
86 LP 916-27 WD* 15 45 22.4310773648 -27 40 05.147539707   15.44 15.42 15.76 15.31 DB4 18 0
87 Ton 249 WD* 15 47 54.5058110112 +24 20 39.889788774   15.5   16.35   DB4 12 0
88 KUV 15519+1730 WD* 15 54 09.0156251007 +17 21 24.188135148     17.5     DBA 20 0
89 KUV 15571+1913 WD* 15 59 21.0798596049 +19 04 08.303154260   15.5 15.4     DB 19 0
90 LB 9514 WD* 16 13 01.5329521515 +23 48 30.812862029   12.70 14.67 16.14   DB4 28 0
91 GD 198 WD* 16 15 23.9764012621 -11 18 30.093352331   15.42 15.53     DB 25 0
92 PG 1644+199 WD* 16 46 19.7552668351 +19 46 03.644051646   15.03 15.07 15.18   DB4 14 0
93 GD 358 WD* 16 47 18.3926893312 +32 28 32.865420612 12.511 13.530 13.653 13.752 13.852 DB2 324 0
94 PG 1654+160 WD* 16 56 57.4673202165 +15 56 27.792793931           DB2 49 0
95 PG 1703+319 WD* 17 05 47.1438671163 +31 50 07.574118070   16.13       DB4: 17 0
96 GD 205 WD* 17 11 55.6599259474 +23 01 01.526941654   14.81   15.1   DBAZ 35 0
97 GD 524 WD* 17 28 56.2199462336 +55 58 22.632470319   16.19   15.89   DBQ4 49 0
98 WG 34 WD* 17 30 23.0914816854 -57 55 25.710395136   15.23 15.27     DB 17 1
99 L 7-44 WD* 17 32 54.9454901946 -87 10 02.552802661   14.64 14.70 15.04   DBN 15 0
100 GD 378 WD* 18 23 37.0115357579 +41 04 02.105626146 13.246 14.208 14.288 14.324 14.379 DBAZ4 63 0
101 LAWD 74 WD* 19 20 34.9229875534 -07 40 00.066805378 11.553 12.345 12.290 12.229 12.164 DBQA5 204 0
102 L 1573-31 WD* 19 42 13.0000598717 +37 31 56.598511711   14.42   14.5   DB1 45 1
103 L 279-25 WD* 20 38 16.8479817477 -53 04 25.342590675 13.32 14.27 14.36     DB 25 0
104 GD 392 WD* 21 00 21.5116239899 +34 26 20.995931784 14.89 15.73   15.6   DB5 39 0
105 LAWD 87 WD* 21 32 16.2327559970 +00 15 14.398335415 13.717 14.634 14.674 14.675 14.676 DB4 169 1
106 GD 233 WD* 21 33 34.8530962350 -04 32 24.116792231   14.45 14.50     DB4 35 0
107 LAWD 89 WD* 21 47 37.288800 -07 44 12.37632 13.752 14.77 14.83 14.96 14.889 DB0 65 0
108 G 188-27 WD* 21 49 54.5666370277 +28 16 59.591209411   15.1   14.5   DB4.5 39 0
109 HE 2149-0516 WD* 21 51 43.3452591750 -05 02 46.927476123   15.58 15.49 15.63   DAB 5 0
110 G 241-6 WD* 22 23 33.1053887000 +68 37 24.283106742   15.7 15.65 15.7   DB 37 0
111 EGGR 906 WD* 22 31 45.4247888462 +14 11 13.997492358   16.05 16.10 16.4   DB4 18 0
112 EGGR 907 WD* 22 36 41.9749119941 +06 40 17.427987415   16.06 16.17 16.14   DB2 18 0
113 KPD 2236+5410 WD* 22 38 23.5895967633 +54 26 14.000518879 15.21 16.13 16.19 16.17   DB 9 0
114 EGGR 908 WD* 22 48 45.4799091520 +12 20 07.215987147   16.6   16.6   DB4 20 0
115 GD 554 WD* 22 52 20.4163923750 +74 54 59.503010540   16.2   16.5   DB3 13 0
116 GD 243 WD* 22 55 47.4263475309 -06 00 50.380533376   15.01 15.01 15.27   DBA4 24 0
117 EGGR 909 WD* 23 12 46.5657095780 +17 51 59.980123222   15.97 15.93 16.16   DB4 18 0
118 EGGR 264 WD* 23 19 35.3881040214 -17 05 28.468265988 13.279 14.132 14.111 14.07 14.049 DB3 111 0
119 GD 406 WD* 23 30 40.7077089725 +51 21 49.736734463 14.11 15.03   15.1   DB 17 0
120 PG 2354+159 WD* 23 56 34.7463193255 +16 15 40.257530063   15.78   16.15   DBZ 20 0

    Equat.    Gal    SGal    Ecl

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2021.05.17-03:56:27

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