2011A&A...530A.114K


C.D.S. - SIMBAD4 rel 1.7 - 2021.01.26CET00:38:22

2011A&A...530A.114K - Astronomy and Astrophysics, volume 530A, 114-114 (2011/6-1)

Cool DZ white dwarfs in the SDSS.

KOESTER D., GIRVEN J., GAENSICKE B.T. and DUFOUR P.

Abstract (from CDS):

We report the identification of 26 cool DZ white dwarfs that lie across and below the main sequence in the Sloan Digital Sky Survey (SDSS) (u-g) vs. (g-r) two-color diagram; 21 of these stars are new discoveries. The sample was identified by visual inspection of all spectra of objects that fall below the main sequence in the two-color diagram, as well as by an automated search for characteristic spectral features over a large area in color space that included the main sequence. The spectra and photometry provided by the SDSS project are interpreted with model atmospheres, including all relevant metals. Effective temperatures and element abundances are determined, while the surface gravity has to be assumed and was fixed at the canonical value of logg=8.These stars represent the extension of the well-known DZ sequence towards cooler temperatures and fill the gap around Teff=6500K present in a previous study. The metal abundances are similar to those in the hotter DZ, but the lowest abundances are missing, probably because of our selection procedures. The interpretation is complicated in terms of the accretion/diffusion scenario, because we do not know if accretion is still occurring or has ended long ago. Independent of that uncertainty, the masses of the metals currently present in the convection zones - and thus an absolute lower limit of the total accreted masses - of these stars are similar to the largest asteroids in our solar system.

Abstract Copyright:

Journal keyword(s): white dwarfs - stars: abundances - accretion, accretion disks - diffusion - line: profiles

Simbad objects: 30

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Number of rows : 30

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 SDSS J014300.52+011356.8 WD* 01 43 00.5240752178 +01 13 56.981939985           DZ 5 0
2 SDSS J015748.15+003315.2 WD* 01 57 48.1460243093 +00 33 15.148466531           DZP 10 0
3 SDSS J020534.13+215559.7 WD* 02 05 34.0869434585 +21 55 59.601225428           DZ 7 0
4 GD 40 WD* 03 02 53.1038447765 -01 08 33.798642438   15.51 15.56     DBZ4 155 0
5 EGGR 566 WD* 03 25 11.0473248379 -01 49 15.047384952   16.8 16.22     DZA9 71 0
6 SDSS J073842.56+183509.6 WD* 07 38 42.5661244319 +18 35 09.712499469           DBZ 46 0
7 LP 369-22 WD* 09 16 21.3072137960 +25 40 29.102115719   18.3   17.6   DZ 9 0
8 SDSS J092523.10+313019.0 WD* 09 25 23.10048 +31 30 19.0764           DZ 4 0
9 SDSS J093719.14+522802.3 WD* 09 37 19.1562066408 +52 28 02.326345648           DZ 9 0
10 SDSS J095645.15+591240.6 WD* 09 56 45.1474931202 +59 12 40.639265026           DZA 16 0
11 SDSS J103809.19-003622.5 WD* 10 38 09.18336 -00 36 22.3524   17.3   16.7   DZ 15 0
12 LP 372-53 WD* 10 40 46.5179214304 +24 08 00.172268254   19.7   18.9   DZ 7 0
13 SDSS J104319.84+351641.6 WD* 10 43 19.8695716712 +35 16 42.094531637           DZ 7 0
14 SDSS J110304.15+414434.9 WD* 11 03 04.1651728463 +41 44 35.046505492           DZ 5 0
15 LSPM J1144+1218 WD* 11 44 41.8898127805 +12 18 29.340819951   18.4   17.9   DZ 5 0
16 SDSS J115224.51+160546.7 WD* 11 52 24.5045911456 +16 05 46.798769338           DZP 5 0
17 SDSS J123415.21+520808.1 WD* 12 34 15.2001291787 +52 08 08.301607277           DZ 4 0
18 G 165-7 WD* 13 30 59.4185219799 +30 29 53.651634272   16.73 16.04 15.74 15.60 DZ7 66 0
19 SDSS J133624.26+354751.2 WD* 13 36 24.2722714286 +35 47 51.702832247           DZ 6 0
20 SDSS J135632.63+241606.0 WD* 13 56 32.5994963607 +24 16 06.270961570   19.53 19.20     DZ 5 0
21 LSPM J1404+3620 WD* 14 04 10.7653018561 +36 20 57.113836015   19.1   18.6   DZ 7 0
22 SDSS J140557.10+154940.5 WD* 14 05 57.1320960048 +15 49 40.569843411           DZ 5 0
23 SDSS J142120.11+184351.6 WD* 14 21 20.1291126019 +18 43 51.732637144           DZ 5 0
24 SDSS J143007.15-015129.5 WD* 14 30 07.1596342075 -01 51 29.661208375           DZ 4 0
25 SDSS J152449.58+404938.1 WD* 15 24 49.5783096614 +40 49 38.072187566           DZ 6 0
26 G 137-24 WD* 15 35 05.8098839974 +12 47 45.199488283   15.31   15.7   DZ 27 0
27 SDSS J154625.33+300946.2 WD* 15 46 25.3447321707 +30 09 46.247193063           DZ 5 0
28 SDSS J155429.01+173545.9 WD* 15 54 29.0042245272 +17 35 46.540011726           DZ 5 0
29 SDSS J161603.00+330301.2 WD* 16 16 03.0097195537 +33 03 01.130219985           DZ 5 0
30 SDSS J234048.74+081753.3 WD* 23 40 48.6807627376 +08 17 53.204606963           DZ 5 0

    Equat.    Gal    SGal    Ecl

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2021.01.26-00:38:22

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