2006AJ....132..676E

Query : 2006AJ....132..676E

2006AJ....132..676E - Astron. J., 132, 676-691 (2006/August-0)

Hot DB white dwarfs from the Sloan Digital Sky Survey.

EISENSTEIN D.J., LIEBERT J., KOESTER D., KLEINMAN S.J., NITTA A., SMITH P.S., BARENTINE J.C., BREWINGTON H.J., BRINKMANN J., HARVANEK M., KRZESINSKI J., NEILSEN E.H.Jr, LONG D., SCHNEIDER D.P. and SNEDDEN S.A.

Abstract (from CDS):

We present ugriz photometry and optical spectroscopy for 28 DB and DO white dwarfs with temperatures between 28,000 and 45,000 K. About 10 of these are particularly well observed; the remainder are candidates. These are the hottest DB stars yet found, and they populate the ``DB gap'' between the hotter DO stars and the familiar DB stars cooler than 30,000 K. Nevertheless, after carefully matching the survey volumes we find that the ratio of DA stars to DB stars is a factor of 2.5 larger at 30,000 than at 20,000 K, suggesting that the ``DB gap'' is indeed deficient and that some kind of atmospheric transformation takes place in roughly 10% of DA stars as they cool from 30,000 to 20,000 K.

Abstract Copyright: ∼

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

VizieR on-line data: <Available at CDS (J/AJ/132/676): table1.dat>

Simbad objects: 39

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Number of rows : 39
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 PB 5823 WD* 00 15 29.7456358704 +01 05 21.390970776   19       DB 18 0
2 Feige 7 WD* 00 43 45.9806246832 -10 00 25.016051736   14.49       DBAP3 114 0
3 EGGR 409 WD* 01 14 37.6538960064 +10 41 04.757053956   15.27 15.41 15.69   DB2.5 75 0
4 Feige 20 WD* 02 12 04.8543806520 +08 46 50.889500292   13.7 13.84 14.2   DA1.4 49 0
5 GALEX J040854.5-043354 WD* 04 08 54.6011474376 -04 33 54.654391008           DBHA: 11 0
6 BD+52 913 WD* 05 05 30.6180977592 +52 49 51.919301604 10.25 11.44 11.69 11.93 12.108 DA.8 1153 0
7 GALEX J074538.1+312205 WD* 07 45 38.1750431904 +31 22 05.389097736   18.48 19.11     DO 13 0
8 GALEX J081115.1+270622 WD* 08 11 15.0855379728 +27 06 21.822122160   17.65 18.38     DO 12 0
9 GALEX J081546.0+244604 WD* 08 15 46.0844601144 +24 46 03.249153444   18.17 18.82     DO 12 0
10 SDSS J084823.52+033216.7 WD* 08 48 23.5261939680 +03 32 16.723735764           DB 10 0
11 GALEX J084916.2+013721 WD* 08 49 16.1809195632 +01 37 21.312592500           DB 8 0
12 EGGR 904 WD* 08 56 18.9476777928 +16 11 03.744751560   15.544 15.595 15.885   DB2 65 1
13 GALEX J090232.2+071929 WD* 09 02 32.1846692952 +07 19 29.955500760           DB 10 0
14 GALEX J090456.0+525029 WD* 09 04 56.1257331768 +52 50 29.837691600           DB 17 0
15 GALEX J092544.4+414803 WD* 09 25 44.4109892304 +41 48 03.220741476           DB 9 0
16 SDSS J093041.80+011508.4 WD* 09 30 41.7960941904 +01 15 08.457295536           DB 10 0
17 GALEX J093759.5+091653 WD* 09 37 59.5172024448 +09 16 53.255803512           DB 10 0
18 SDSS J095256.69+015407.7 WD* 09 52 56.6848210104 +01 54 07.726463856           DB 18 0
19 PG 1133+489 ** 11 36 09.5961625656 +48 43 18.932567988   16.20 14.22     DB+dM 41 0
20 PG 1210+533 WD* 12 13 24.6385007064 +53 03 57.231428724 12.619 13.824 14.135 14.281 14.472 DAO1.1 59 0
21 BD+25 2534 HS* 12 37 23.5161671712 +25 03 59.867922240 9.117 10.26 10.59 10.642 10.809 sdB1(k) 268 0
22 GALEX J123750.5+085526 WD* 12 37 50.4667464576 +08 55 26.007587580           DB 11 0
23 GD 323 WD* 13 04 32.1779341920 +59 27 32.817952944   14.39 14.52     DAB2 78 0
24 PG 1305-017 WD* 13 08 15.2126933712 -01 59 04.415410896   16.25 16.0     DAO1.1 37 0
25 2QZ J134524.9-023714 WD* 13 45 24.9234972888 -02 37 14.191932792   19.49       DB 11 0
26 SDSS J140159.09+022126.7 WD* 14 01 59.0970538224 +02 21 26.753416776           DB 13 0
27 GALEX J141258.2+045602 WD* 14 12 58.1751177408 +04 56 02.245773048           DB 18 0
28 GALEX J141349.4+571716 WD* 14 13 49.4658025872 +57 17 16.328658768           DB 14 0
29 GALEX J143227.2+363215 WD* 14 32 27.2458339416 +36 32 15.143796960           DB 12 0
30 GALEX J153852.3-012133 WD* 15 38 52.3461890640 -01 21 33.796181808           DBAH: 7 0
31 SBSS 1540+505 WD* 15 42 01.4916378216 +50 25 32.004175152   17.0       DB 20 0
32 PG 1603+432 WD* 16 05 21.1618424160 +43 04 35.934912660     15.32     DA1.3 40 0
33 GALEX J164703.4+245129 WD* 16 47 03.4377144168 +24 51 29.193803568           DB 8 0
34 GD 358 WD* 16 47 18.3925183824 +32 28 32.862804384 12.511 13.530 13.653 13.752 13.852 DB2 364 0
35 GALEX J211149.5-053938 WD* 21 11 49.5924356904 -05 39 38.317930488           DB 13 0
36 GALEX J212403.1+114229 WD* 21 24 03.1214076072 +11 42 30.128783724           DB 13 0
37 PB 7014 WD* 21 55 14.4399443544 -07 58 33.758380020   18.5       DB 15 0
38 GALEX J222833.8+141036 ** 22 28 33.8221146672 +14 10 36.997462020           DB+dM: 15 0
39 GALEX J234709.2+001858 WD* 23 47 09.2944032888 +00 18 57.980615220           DB 13 0

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