2006A&A...454..951K


Query : 2006A&A...454..951K

2006A&A...454..951K - Astronomy and Astrophysics, volume 454, 951-956 (2006/8-2)

New DQ white dwarfs in the Sloan Digital Sky Survey DR4: confirmation of two sequences.

KOESTER D. and KNIST S.

Abstract (from CDS):

DQ white dwarfs show atomic or molecular carbon features in their spectra. The atmosphere consists of helium and the carbon is believed to be dredged-up to the surface by the deepening helium convection zone. We want to identify new DQ in the Data Release 4 of the Sloan Digital Sky Survey, determine the effective temperatures and carbon abundances and search for systematic trends between these parameters as indication of the origin of this class. Photometric selection criteria are developed and applied to the catalog to identify candidates, which are in a final step confirmed by visual inspection of spectra. The parameters are determined through comparison with theoretical spectra and colors. Our final DQ catalog contains 65 stars. 40 of these are new identifications, the other 25 have been described as DQ before in the literature. We derive effective temperatures and carbon abundances for 60 of these stars. The majority of stars defines a clear sequence in the C abundance vs. Teff diagram, with high abundances found at high Teff and vice versa. We also confirm with high significance a second sequence with an abundance about 1dex higher at the same Teff, and discuss the nature and possible origin of the high-C sequence.

Abstract Copyright:

Journal keyword(s): stars: white dwarfs - stars: abundances

Simbad objects: 66

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Number of rows : 66
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 SDSS J000011.57-085008.4 WD* 00 00 11.5625888952 -08 50 08.360956500           DQ 14 0
2 SDSS J000807.54-103405.6 WD* 00 08 07.5400890816 -10 34 05.545519860           DQ 14 0
3 PB 8211 WD* 00 25 31.4971174848 -11 08 00.759215400   17.5       DQ 17 0
4 SDSS J015433.57-004047.2 WD* 01 54 33.5832797088 -00 40 47.120893788           DQ 16 0
5 LP 468-295 WD* 01 54 41.7480581424 +14 03 07.966824192   17.73   17.6   DQ 26 0
6 SDSS J032054.11-071625.4 WD* 03 20 54.1139675112 -07 16 25.477050324           DQ6 17 0
7 SDSS J033218.22-003722.1 WD* 03 32 18.2265910008 -00 37 22.317278592           DQ 18 0
8 SDSS J074204.78+434835.7 WD* 07 42 04.7993029848 +43 48 35.864047368           DQ 11 0
9 SDSS J084131.55+332915.5 WD* 08 41 31.5588708600 +33 29 15.480149496   18.29 18.36     DQ 12 0
10 GALEX J085239.6+042804 WD* 08 52 39.6617763072 +04 28 04.480357008   18.75 19.11     DQ 11 0
11 LSPM J0855+0639 WD* 08 55 06.6477765624 +06 39 04.580341560   17.4   17.5   DQ 19 0
12 SDSS J085709.01+060357.4 WD* 08 57 09.0117491544 +06 03 57.569400252   18.20 18.42     DQ 12 0
13 SDSS J090157.92+575135.9 WD* 09 01 57.9116234880 +57 51 35.909109360           DQ 17 0
14 SDSS J090449.72+395416.4 WD* 09 04 49.7362304352 +39 54 16.609661424   19.37 19.47     DQ 13 0
15 EGGR 532 WD* 09 05 14.7450290358 +09 04 27.317404610   16.8   16.6   DQ 27 0
16 SDSS J090632.16+470235.8 WD* 09 06 32.1962943960 +47 02 35.959184664   20.56 19.88     DQ 12 0
17 PG 0913+104 WD* 09 16 02.6879038848 +10 11 10.690622088   16.0   15.4   DCQ5 32 0
18 SDSS J091830.26+484323.0 WD* 09 18 30.2784049488 +48 43 23.482660728   20.02 20.25     DQ 11 0
19 SDSS J091922.18+023605.0 WD* 09 19 22.1837421096 +02 36 05.075713908           DQ 18 0
20 SDSS J092153.46+342136.8 WD* 09 21 53.4592462872 +34 21 37.089291744   18.36 18.60     DQ 12 0
21 SDSS J092613.45+472521.1 WD* 09 26 13.4603328792 +47 25 21.225470772   18.20 18.32     DQ 15 0
22 SDSS J092909.02+331011.7 WD* 09 29 09.0410182704 +33 10 11.769390516   18.74 18.56     DQ 13 0
23 SDSS J093537.00+002422.0 WD* 09 35 37.0009523664 +00 24 21.998557296           DQ 12 1
24 SDSS J094004.63+021022.5 WD* 09 40 04.6380678816 +02 10 22.638196668           DQ 21 0
25 LSPM J0940+0906 WD* 09 40 14.6172105336 +09 06 41.777037504   18.7   18.3   DQ 12 0
26 SDSS J094115.18+090154.4 WD* 09 41 15.1833524952 +09 01 54.815168892   16.49 16.78     DQ 12 0
27 US 846 WD* 09 41 38.0785026480 +44 14 58.359704424   18.6 18.65     DQ 14 1
28 SDSS J095137.60+624348.7 WD* 09 51 37.5945612672 +62 43 48.731766096           DQ 15 0
29 SDSS J095934.94+453725.4 WD* 09 59 34.9530806496 +45 37 25.411875636   19.78 19.85     DQ 9 0
30 SDSS J100059.82+100531.7 WD* 10 00 59.8170996120 +10 05 31.832019492   19.13 19.23     DQ 9 0
31 LSPM J1017+3736 WD* 10 17 50.3262601104 +37 36 37.872255924   19.0   18.9   DQ 14 0
32 LP 489-64 WD* 10 18 00.0353519736 +08 38 20.531178312   16.4   16.1   DQ 20 0
33 LP 92-134 WD* 10 26 35.8120256256 +58 07 14.858803272   16.7   17.1   DQ 17 0
34 LP 214-38 WD* 11 07 59.5336527240 +40 59 10.773589236   17.08   14.0   DQ 22 0
35 CSO 1140 WD* 11 09 12.1870722504 +42 49 56.112176028   17.14 17.40     DQ 14 0
36 SDSS J112604.29+441938.6 WD* 11 26 04.3318595520 +44 19 38.572521528   18.93 19.06     DQ 11 0
37 SDSS J113359.94+633113.2 WD* 11 33 59.9561335512 +63 31 13.425360024           DQ 13 0
38 GD 311 WD* 11 35 34.6730038704 +57 24 51.918212052   16.0   16.0   DQ 24 0
39 LBQS 1146-0109 WD* 11 48 51.6859760808 -01 26 12.691057740           DQ 25 0
40 LSPM J1151+4527 WD* 11 51 49.9721123976 +45 27 29.531388384   17.3   17.5   DQ 12 0
41 LSPM J1225+4706 WD* 12 25 45.9438677760 +47 06 13.064637672   20.0   19.1   DQ 14 0
42 A3 434 WD* 12 33 47.5942718544 +12 53 45.802134960   16.9 17.20     DQ+M 14 0
43 LP 217-47 WD* 12 37 52.2312390106 +41 56 24.685623772   16.8   16.7   DQ 28 0
44 2QZ J125359.5+013925 WD* 12 53 59.6144449296 +01 39 25.622122824           DQ 15 0
45 SDSS J130945.62+444540.9 WD* 13 09 45.6551488704 +44 45 41.018100156   18.75 18.88     DQ 11 0
46 PB 130 WD* 13 15 34.7021687472 +47 11 09.358356300   17.7   17.6   DQ 18 0
47 SDSS J131930.65+140137.1 WD* 13 19 30.6340787640 +14 01 37.399589292           DQ 12 0
48 SDSS J132858.19+590851.0 WD* 13 28 58.2162380184 +59 08 51.112696920           DQAP 17 0
49 SDSS J133127.04+670419.5 WD* 13 31 27.0201202680 +67 04 19.534386756   18.62 18.92     DC 14 0
50 EGGR 362 WD* 14 27 28.2968374824 +61 10 26.468185872   16.8   16.8   DQ 34 0
51 SDSS J143144.83+375011.8 WD* 14 31 44.8451420184 +37 50 11.793561108   19.25 19.18     DQ 12 0
52 SDSS J144407.25+043446.8 WD* 14 44 07.2561020352 +04 34 46.773651576           DQ 13 0
53 2QZ J144808.1-004756 WD* 14 48 08.0670927840 -00 47 55.914814356           DQ 22 0
54 SDSS J152812.04+513445.1 WD* 15 28 12.0426818928 +51 34 45.293986200   18.24 18.41     DQ 13 0
55 LSPM J1534+4145 WD* 15 34 47.5868423184 +41 45 59.143358628   17.5   17.1   DQZ 17 0
56 SDSS J154810.66+562647.7 WD* 15 48 10.6618217160 +56 26 47.729119380           DQ 14 0
57 SDSS J155413.53+033634.5 WD* 15 54 13.5198739584 +03 36 34.737167988           DQ 18 0
58 SDSS J161653.35+392444.4 WD* 16 16 53.3771380944 +39 24 44.347460652   18.12 18.25     DQ 16 0
59 SDSS J164328.54+400204.3 WD* 16 43 28.5392890128 +40 02 04.217664912           DQ 10 0
60 SDSS J165436.85+315754.4 WD* 16 54 36.8663569776 +31 57 54.362845476   17.33 17.46     DQ 17 0
61 SDSS J165538.51+372247.1 WD* 16 55 38.5116123264 +37 22 47.121840588           DQ+M 16 0
62 LP 331-55 WD* 17 13 41.7506231640 +32 40 09.194529144   17.14   17.2   DQ 20 0
63 SDSS J205316.34-070204.3 WD* 20 53 16.3351167072 -07 02 04.160103108           DQ 19 1
64 SDSS J211130.04-003628.7 WD* 21 11 30.0391429632 -00 36 28.662186096   18.10 18.21     DQ 13 0
65 2SLAQ J213503.31+000318.4 WD* 21 35 03.3058560288 +00 03 18.521856540   19.24 19.22     DQ 11 0
66 LP 700-32 WD* 22 32 24.0151421688 -07 44 34.253259864     17.59     DQ 22 0

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2023.06.10-13:39:39

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