1995A&A...297..216W

Query : 1995A&A...297..216W

1995A&A...297..216W - Astronomy and Astrophysics, volume 297216-222 (1995/5-1)

Surface carbon abundances and compositional stratification of cool helium-rich white dwarfs.

WEIDEMANN V. and KOESTER D.

Abstract (from CDS):

From the ultraviolet lines of CI in IUE spectra of the DQ white dwarfs L 845-70, GD 84, and G 188-27 we determine a surface carbon abundance of logC/He=-7, and Teff=9250, 9000 and 11000K. Comparison with the results for other stars of the same spectral class indicates variations in carbon abundance at the same temperature. If the carbon is the result of surface pollution by interior carbon dredged up by convection, we conclude that the variations cannot be caused by mass differences but probably by different outer helium layer thicknesses.

Abstract Copyright: ∼

Journal keyword(s): stars: atmospheres - abundances - stars: white dwarfs - stars: individual: L 845-70 , GD 84, G 188-27

Simbad objects: 29

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Number of rows : 29
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 EGGR 508 WD* 00 03 31.6265277744 -16 43 58.413431892   14.68 14.58 14.90   DB4 45 0
2 GD 408 WD* 00 05 06.8206130400 +73 13 09.383025900   14.27   14.4   DB4 82 0
3 EGGR 245 WD* 00 41 22.0414216378 +55 50 08.351549381 13.30 14.11 14.05 14.3   DBQ5 65 0
4 Ton S 169 WD* 00 45 27.5018198545 -23 36 29.283407543   16.7   16.7   DQ 29 0
5 Wolf 1516 WD* 01 18 00.0751414753 +16 10 20.561712526   13.96   13.9   DC6 101 0
6 G 35-26 WD* 02 05 49.6964557927 +20 57 07.963899624   17.1   17.4   DAQ3 61 0
7 Wolf 219 WD* 03 44 34.8473315202 +18 26 09.820674151   15.50   14.8   DQ8 90 0
8 EGGR 41 WD* 04 37 47.4072688697 -08 49 10.619853645   14.24 14.10     DQ8 96 0
9 GD 84 WD* 07 18 01.9004201064 +45 47 53.065882680   15.27   15.2   DBAZ?6 47 0
10 LAWD 25 WD* 07 40 20.7886676070 -17 24 49.156867583   13.36 13.061 12.886 12.70 DZQA6 218 0
11 L 97-3 WD* 08 06 53.7536568947 -66 18 16.701075068   13.76 13.70 13.66 13.61 DQ 107 1
12 Ton 368 WD* 08 59 14.7138293023 +32 57 12.158356354   15.18   14.9   DQ6 112 0
13 L 462-56 A WD* 09 36 59.7883670064 -37 21 30.803043503     14.85 15.11   DQ6 36 0
14 LAWD 37 WD* 11 45 42.9169346379 -64 50 29.461957832 11.08 11.725 11.513 11.34 11.163 DQ 287 0
15 PG 1225-079 WD* 12 27 47.3585913504 -08 14 37.972720428   14.86 14.74 15.15   DZA4 85 0
16 PG 1501+664 WD* 15 02 09.6299323152 +66 12 19.148868324   16.07 16.37     DZQ1 163 0
17 GD 358 WD* 16 47 18.3925183824 +32 28 32.862804384 12.511 13.530 13.653 13.752 13.852 DB2 364 0
18 LAWD 66 WD* 17 11 26.7618554561 -14 47 53.694798155   14.38 14.29 14.49   DQwk 49 0
19 GD 524 WD* 17 28 56.2202490696 +55 58 22.634215356   16.19   15.89   DBQ4 64 0
20 LAWD 71 WD* 18 42 28.6840052526 -61 51 53.664525624   14.91 14.69 14.72   DC 32 0
21 LAWD 74 WD* 19 20 34.9229289504 -07 40 00.065957592 11.553 12.345 12.290 12.229 12.164 DBQA5 250 0
22 EGGR 262 WD* 21 01 44.8121221316 +31 48 39.472072898 14.36 15.11   15.35   DQ5 57 0
23 LAWD 87 WD* 21 32 16.2327040616 +00 15 14.399267982 13.717 14.634 14.674 14.675 14.676 DB4 195 1
24 EGGR 148 WD* 21 42 41.0063054408 +20 59 58.123903616   13.40   12.9   DQ6 128 0
25 G 188-27 WD* 21 49 54.5666278344 +28 16 59.591324712   15.1   14.5   DB4.5 52 0
26 WG 39 WD* 21 57 38.3567715267 -51 00 31.521044535   14.94 14.73 14.53   DQ7 87 0
27 LAWD 91 WD* 22 19 48.3089909755 -65 29 17.484537097 13.98 14.66 14.53     DZ5 61 0
28 EGGR 264 WD* 23 19 35.3881861344 -17 05 28.465573380 13.279 14.132 14.111 14.07 14.049 DB3 131 0
29 EGGR 507 WD* 23 54 56.2782027401 +40 27 29.541384732   15.28   15.0   DQ5 60 0

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