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 - 2022
#notes
1 PB 5835 WD* 00 16 51.4153668936 -01 13 29.300107908   16 16.80 17.41   PG1159 17 0
2 SDSS J003343.06+142251.5 WD* 00 33 43.0562777736 +14 22 51.483297252           DBAO 11 0
3 PG 0046+078 WD* 00 48 37.8852581712 +08 02 44.860028568   15.59 15.590     DO 19 0
4 HS 0111+0012 WD* 01 13 46.7761796520 +00 28 28.644373920   14.59 14.9     DO 32 0
5 SDSS J015629.58+131744.7 WD* 01 56 29.5802763120 +13 17 44.795960340   18.5 18.25 18.6   DB2 14 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 23 0
8 SDSS J034101.39+005353.0 WD* 03 41 01.3946045856 +00 53 52.921063176   17.38 18.03     DO 13 0
9 SDSS J034227.62-072213.2 WD* 03 42 27.6240653688 -07 22 13.267809804   17.20 17.88     DO 18 0
10 KUV 03467-0108 WD* 03 49 17.4089215872 -00 59 19.230310320   18.0 17.81     PG1159 17 1
11 SDSS J074538.17+312205.3 WD* 07 45 38.1750431904 +31 22 05.389097736   18.48 19.11     DO 10 0
12 KUV 07523+4017 WD* 07 55 40.9407521736 +40 09 17.910022752   17.00 17.53     PG1159 18 0
13 SDSS J075606.36+421613.0 ** 07 56 06.3634519800 +42 16 13.087722144   18.61 19.20     DO+dM: 14 0
14 SDSS J081115.08+270621.7 WD* 08 11 15.0855379728 +27 06 21.822122160   17.65 18.38     DO 9 0
15 SDSS J081533.08+264646.4 WD* 08 15 33.0830994048 +26 46 46.429501080   19.02 19.72     DO: 5 0
16 SDSS J081546.08+244603.2 WD* 08 15 46.0844601144 +24 46 03.249153444   18.17 18.82     DO 9 0
17 SDSS J083504.76+090111.7 WD* 08 35 04.7633637792 +09 01 11.693960364           DAO 6 0
18 SDSS J084008.72+325114.5 WD* 08 40 08.7205921800 +32 51 14.608748916   18.20 18.93     DO 11 0
19 SDSS J084223.13+375900.1 WD* 08 42 23.1504166464 +37 59 00.142597176   17.07 17.83     DO 8 0
20 SBSS 0910+584 WD* 09 14 33.5975611320 +58 12 38.119111740   17.15 17.79     DO 18 0
21 SDSS J091621.83+052119.1 ** 09 16 21.81960 +05 21 19.0080   16.24 16.94     DO+M 12 0
22 SDSS J093546.53+110529.0 WD* 09 35 46.5393775728 +11 05 28.911314760           PG1159 13 0
23 SBSS 1020+541 WD* 10 23 27.4218578112 +53 52 58.706674968   17.5 17.91     PG1159 18 0
24 SDSS J110215.45+024034.2 HS* 11 02 15.4576572936 +02 40 34.333042044   16.78 17.48     sdO 11 0
25 PG 1133+489 ** 11 36 09.5961625656 +48 43 18.932567988   16.20 14.22     DB+dM 35 0
26 SDSS J113631.49+591229.6 WD* 11 36 31.5010247304 +59 12 29.653838316   17.59 18.34     DAO 9 0
27 SDSS J115218.69-024915.8 WD* 11 52 18.6960634680 -02 49 15.862943568   17.35 18.03     DAB 7 0
28 V* GW Vir WD* 12 01 45.9731868264 -03 45 40.628670300   14.87 15.04     DOQZ1 475 0
29 SDSS J121523.08+120300.7 WD* 12 15 23.0850752112 +12 03 00.798385248   17.37 18.19     PG1159 11 0
30 SDSS J130249.00-013309.5 WD* 13 02 49.0038207672 -01 33 09.502103916   18.27 18.94     DB 10 0
31 PG 1314+003 WD* 13 17 24.7478552856 +00 02 37.381355736   15.97       DO 28 1
32 SDSS J133633.21-013116.5 ** 13 36 33.2261910096 -01 31 16.684087584   17.25 17.46     DO+M 9 0
33 FBS 1342+673 WD* 13 43 41.8834097904 +67 01 54.512227344   16.37 17.15     PG1159 19 0
34 SDSS J140409.96+045739.9 WD* 14 04 09.9523506456 +04 57 40.013018748   16.96 17.71     DO 13 0
35 SBSS 1404+566 WD* 14 06 15.8235775608 +56 27 25.870742748   18.5 18.47     DBH: 12 0
36 PG 1424+535 WD* 14 25 55.4615842224 +53 15 25.138507140   15.86       PG1159 71 0
37 SBSS 1446+575 WD* 14 47 34.1180967672 +57 20 53.108181168   17.28 18.05     PG1159 15 0
38 SDSS J150053.98+025143.2 WD* 15 00 53.9916947400 +02 51 43.193677752   19.03 19.69     DO: 6 0
39 FBS 1509+613 WD* 15 10 26.4750534960 +61 06 56.929132152   16.47 17.27     DO 18 0
40 SDSS J154752.33+423210.8 WD* 15 47 52.3353687984 +42 32 10.828741056   17.09 17.81     DO 10 0
41 SDSS J155356.81+483228.6 WD* 15 53 56.8002486888 +48 32 28.593680352           DO 13 0
42 HD 149499B WD* 16 38 31.199 -57 28 10.70   11.12 11.26     DOZ1 101 0
43 SDSS J204158.97+000325.4 WD* 20 41 58.9730999136 +00 03 25.442636256   18.35 19.06     DAO 9 0
44 SDSS J205930.25-052848.9 WD* 20 59 30.2543420304 -05 28 48.946741140   17.22 17.94     DO 11 0
45 SDSS J213932.48+112611.2 WD* 21 39 32.4880115136 +11 26 11.282198460   18.89 19.50     DO: 6 0
46 SDSS J214223.31+111740.3 WD* 21 42 23.3160651120 +11 17 40.364741148   17.23 17.90     DO 8 0
47 PG 2333-002 HS* 23 35 41.4718869864 +00 02 19.519541340   15.676 15.871     sdOC5VIIHe40 23 0

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2022.08.15-14:31:29

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