2006A&A...454..617H

Query : 2006A&A...454..617H

2006A&A...454..617H - Astronomy and Astrophysics, volume 454, 617-624 (2006/8-1)

Spectral analyses of eighteen hot H-deficient (pre-) white dwarfs from the Sloan Digital Sky Survey Data Release 4.

HUEGELMEYER S.D., DREIZLER S., HOMEIER D., KRZESINSKI J., WERNER K., NITTA A. and KLEINMAN S.J.

Abstract (from CDS):

The Sloan Digital Sky Survey Data Release 4 has provided spectra of several new PG 1159 stars and DO white dwarfs. This increase in known hot H-deficient compact objects significantly improves the statistics and helps to investigate late stages of stellar evolution. From the optical SDSS spectra, effective temperatures and surface gravities are derived in order to place the observed objects in an evolutionary context. Especially the connection between PG 1159 stars and DO white dwarfs shall be investigated. Using our non-LTE model atmospheres and applying χ2-fitting techniques, we determine stellar parameters and their errors. We derive total stellar masses for the DO white dwarfs using model evolutionary tracks. We confirm three PG 1159 stars, with one showing ultra-high excitation ion features, and one sdO which we originally classified as a PG 1159 star. Additionally, we re-analysed the known PG 1159 star, PG 1424+535, with our new models. Furthermore, we present the first spectral analyses of thirteen DO white dwarfs, three of which show M-star features in their spectra, while two display ultra-high excitation ion features.

Abstract Copyright: ∼

Journal keyword(s): stars: abundances - stars: fundamental parameters - stars: evolution - stars: AGB and post-AGB - stars: white dwarfs - stars: binaries: spectroscopic

Simbad objects: 47

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Number of rows : 47
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 PB 5835 WD* 00 16 51.4153668936 -01 13 29.300107908   16   17.41   PG1159 22 0
2 SDSS J003343.06+142251.5 WD* 00 33 43.0562777736 +14 22 51.483297252           DBAO 15 0
3 PG 0046+078 WD* 00 48 37.8852581712 +08 02 44.860028568   15.59 15.590     DO 21 0
4 PB 6330 WD* 01 13 46.7761796520 +00 28 28.644373920   15.040 15.239 15.635   DO 35 0
5 GALEX J015629.5+131745 WD* 01 56 29.5802763120 +13 17 44.795960340   18.5 18.25 18.6   DB2 16 0
6 PG 0237+116 WD* 02 40 06.6387356664 +11 48 28.043483364   15.12       DO 20 0
7 LB 2828 WD* 02 54 03.7518680400 +00 58 54.223117752   17.5 17.39     DO 25 0
8 GALEX J034101.3+005353 WD* 03 41 01.3946045856 +00 53 52.921063176   17.38 18.03     DO 15 0
9 GALEX J034227.6-072212 WD* 03 42 27.6240653688 -07 22 13.267809804   17.20 17.88     DO 21 0
10 KUV 03467-0108 WD* 03 49 17.4089215872 -00 59 19.230310320   18.0       PG1159 22 1
11 GALEX J074538.1+312205 WD* 07 45 38.1750431904 +31 22 05.389097736   18.48 19.11     DO 13 0
12 KUV 07523+4017 WD* 07 55 40.9407521736 +40 09 17.910022752   17.00 17.53     PG1159 22 0
13 GALEX J075606.3+421612 WD* 07 56 06.3634519800 +42 16 13.087722144   18.61 19.20     DO+dM: 17 0
14 GALEX J081115.1+270622 WD* 08 11 15.0855379728 +27 06 21.822122160   17.65 18.38     DO 12 0
15 GALEX J081533.1+264646 WD* 08 15 33.0830994048 +26 46 46.429501080   19.02 19.72     DO: 6 0
16 GALEX J081546.0+244604 WD* 08 15 46.0844601144 +24 46 03.249153444   18.17 18.82     DO 12 0
17 SDSS J083504.76+090111.7 WD* 08 35 04.7633637792 +09 01 11.693960364           DAO 9 0
18 GALEX J084008.7+325114 WD* 08 40 08.7205921800 +32 51 14.608748916   18.20 18.93     DO 14 0
19 GALEX J084223.1+375859 WD* 08 42 23.1504166464 +37 59 00.142597176   17.07 17.83     DO 12 0
20 SBSS 0910+584 WD* 09 14 33.5975611320 +58 12 38.119111740   17.15 17.79     DO 23 0
21 SDSS J091621.83+052119.1 ** 09 16 21.81960 +05 21 19.0080   16.24 16.94     DO+M 13 0
22 GALEX J093546.5+110529 WD* 09 35 46.5393775728 +11 05 28.911314760           PG1159 18 0
23 SBSS 1020+541 WD* 10 23 27.4218578112 +53 52 58.706674968   17.5 17.91     PG1159 22 0
24 SDSS J110215.45+024034.1 HS* 11 02 15.4576572936 +02 40 34.333042044           sdOHe 19 0
25 PG 1133+489 WD* 11 36 09.5961625656 +48 43 18.932567988   16.20 14.22     DB+dM 40 0
26 GALEX J113631.4+591229 WD* 11 36 31.5010247304 +59 12 29.653838316   17.59 18.34     DAO 12 0
27 SDSS J115218.69-024915.8 WD* 11 52 18.6960634680 -02 49 15.862943568   17.35 18.03     DAB 10 0
28 V* GW Vir WD* 12 01 45.9731868264 -03 45 40.628670300   14.87 15.04     DOQZ1 490 0
29 GALEX J121523.1+120301 WD* 12 15 23.0850752112 +12 03 00.798385248           PG1159 16 0
30 2QZ J130248.9-013310 WD* 13 02 49.0038207672 -01 33 09.502103916   18.27 18.94     DB 14 0
31 PG 1314+003 WD* 13 17 24.7478552856 +00 02 37.381355736   15.97       DO 31 1
32 SDSS J133633.21-013116.5 WD* 13 36 33.2261910096 -01 31 16.684087584   17.25 17.46     DO+M 11 0
33 FBS 1342+673 WD* 13 43 41.8834097904 +67 01 54.512227344           PG1159 23 0
34 GALEX J140409.9+045740 WD* 14 04 09.9523506456 +04 57 40.013018748   16.96 17.71     DO 16 0
35 SBSS 1404+566 WD* 14 06 15.8235775608 +56 27 25.870742748   18.5 18.47     DBH: 15 0
36 PG 1424+535 WD* 14 25 55.4615842224 +53 15 25.138507140   15.412 15.963     PG1159 75 0
37 SBSS 1446+575 WD* 14 47 34.1180967672 +57 20 53.108181168   17.28 18.05     PG1159 18 0
38 GALEX J150054.0+025143 WD* 15 00 53.9916947400 +02 51 43.193677752   19.03 19.69     DB 10 0
39 FBS 1509+613 WD* 15 10 26.4750534960 +61 06 56.929132152   16.47 17.27     DO 20 0
40 GALEX J154752.3+423211 WD* 15 47 52.3353687984 +42 32 10.828741056   17.09 17.81     DO 13 0
41 GALEX J155356.7+483228 WD* 15 53 56.8002486888 +48 32 28.593680352           DO 16 0
42 HD 149499B WD* 16 38 31.199 -57 28 10.70   11.12 11.26     DOZ1 105 0
43 GALEX J204159.0+000326 WD* 20 41 58.9730999136 +00 03 25.442636256   18.35 19.06     DAO 12 0
44 GALEX J205930.3-052848 WD* 20 59 30.2543420304 -05 28 48.946741140   17.22 17.94     DAO 15 0
45 GALEX J213932.5+112611 WD* 21 39 32.4880115136 +11 26 11.282198460           DC 10 0
46 SDSS J214223.31+111740.3 WD* 21 42 23.3160651120 +11 17 40.364741148   17.23 17.90     DO 10 0
47 PG 2333-002 HS* 23 35 41.4718869864 +00 02 19.519541340   15.676 15.871     sdOC5VIIHe40 26 0

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