2011AJ....141...96L

Query : 2011AJ....141...96L

2011AJ....141...96L - Astron. J., 141, 96 (2011/March-0)

Spectroscopic confirmation of UV-bright white dwarfs from the sandage two-color survey of the galactic plane.

LEPINE S., BERGERON P. and LANNING H.H.

Abstract (from CDS):

We present spectroscopic observations confirming the identification of hot white dwarfs among UV-bright sources from the Sandage Two-color Survey of the Galactic Plane and listed in the Lanning (Lan) catalog of such sources. A subsample of 213 UV-bright Lan sources have been identified as candidate white dwarfs based on the detection of a significant proper motion. Spectroscopic observations of 46 candidates with the KPNO 2.1 m telescope confirm 30 sources to be hydrogen white dwarfs with subtypes in the DA1-DA6 range, and with one of the stars (Lan 161) having an unresolved M dwarf as a companion. Five more sources are confirmed to be helium white dwarfs, with subtypes from DB3 to DB6. One source (Lan 364) is identified as a DZ 3 white dwarf, with strong lines of calcium. Three more stars are found to have featureless spectra (to within detection limits) and are thus classified as DC white dwarfs. In addition, three sources are found to be hot subdwarfs: Lan 20 and Lan 480 are classified as sdOB, and Lan 432 is classified sdB. The remaining four objects are found to be field F star interlopers. Physical parameters of the DA and DB white dwarfs are derived from model fits.

Abstract Copyright: ∼

Journal keyword(s): solar neighborhood - stars: kinematics and dynamics - ultraviolet: stars - white dwarfs

Simbad objects: 46

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Number of rows : 46
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 Lan 253 WD* 00 33 40.8905483904 +55 51 45.284637600 14.2 15.74 15.77 15.87 15.6 DA2.5 12 0
2 Lan 197 WD* 00 53 01.7719069296 +59 59 40.617149172 14.4 16.4 16.31 16.2 15.8 DA1.5 9 0
3 Lan 161 WD* 01 19 41.4113250840 +68 51 11.527304436 17.5 17.8 17.52 17.2 16.1 DA3 3 0
4 Lan 24 WD* 01 24 05.4502233768 +69 13 20.898232644   17.0 17.09 17.2 16.3 DA4 8 0
5 Lan 4 WD* 01 26 08.7892861776 +69 01 55.796995848   15.9 16.08 16.3 16.5 DA2 8 0
6 Lan 163 WD* 01 33 38.1452104464 +68 03 33.028362324 16.0 17.6 17.23 16.8 16.9 DA1.5 5 0
7 Lan 159 CV* 01 55 10.4451647688 +69 42 40.269872016 16.7 17.4 17.26 17.1 17.3 DA5.5 13 0
8 Lan 150 WD* 02 15 34.7609753592 +64 53 20.588772264 15.5 17.8   17.0 17.5 DB2.5 10 0
9 GALEX J021906.5+700837 WD* 02 19 06.4289585856 +70 08 38.365883520 15.5 16.6   16.6 17.1 DB2.5 12 0
10 Lan 142 WD* 02 28 49.9142576064 +68 35 37.032772092 16.5 17.6   18.0 18.3 DB3 10 0
11 Lan 280 WD* 02 48 41.5763944824 +59 16 08.902916004 15.8 16.3 16.21 16.1 16.6 DA2.5 8 0
12 Lan 272 WD* 02 57 45.4058880912 +60 34 25.175670780 13.5 15.33 15.50 15.4 15.9 DAO0.5 12 0
13 2MASS J03003728+6228285 WD* 03 00 37.3188409608 +62 28 28.146072720 16.3 16.3   16.6 16.9 DC5 8 0
14 GALEX J030328.0+682952 WD* 03 03 27.8955405552 +68 29 53.370511296 16.2 16.8   16.8 17.4 DBA3.5 10 0
15 Lan 284 WD* 03 04 18.0086461368 +58 44 03.662570904 15.8 16.5 16.55 16.6 17.0 DA2.5 9 0
16 Lan 273 WD* 03 08 18.7247851104 +60 35 27.102009300 16.4 17.6 17.46 17.3 17.2 DA4 8 0
17 Lan 57 WD* 03 10 03.2719924776 +53 09 22.230048708   16.6 16.4 16.2 17.2 DC4 11 0
18 Lan 29 WD* 03 17 51.5253672000 +53 04 19.096424040   17.4 17.49 17.6 17.5 DA2 9 0
19 Lan 486 WD* 03 24 31.2876478344 +62 50 53.225402820 14.6 15.8 15.94 16.1 16.5 DA3 10 0
20 LS I +63 198 HS* 03 29 05.6683420320 +64 04 42.157890228 11.71 13.18 13.20 12.96 13.2 sdOB 22 0
21 Lan 62 WD* 03 31 18.0937271496 +53 03 51.193502676 16.470 16.8 16.89 17.0 17.0 DA3 11 0
22 Lan 174 WD* 03 41 16.9534910592 +62 42 01.970282376 16.1 17.1   17.2 17.6 DB2 10 0
23 Lan 177 WD* 03 51 15.8338077168 +61 52 44.915338884 16.5 16.8   17.3 17.6 DC5 8 0
24 Lan 176 * 03 56 51.0 +62 26 20 12.3 12.6   11.2 10.8 F5V 4 0
25 Lan 191 WD* 04 04 23.8023005712 +58 58 35.740351380 16.5 17.6 17.55 17.5 17.8 DA5 8 0
26 RL 89 WD* 04 06 07.0786118904 +54 31 32.194813152 13.9 15.34 15.39 15.5 15.5 DA2.9 25 0
27 Lan 532 WD* 04 12 42.9917702760 +40 41 25.541221668 15.3 16.4 16.63 16.9 17.0 DA1.5 11 0
28 Lan 188 WD* 04 16 02.4953658456 +59 44 02.082765228 16.9 17.8 17.98 18.2 18.5 DA2 5 0
29 Lan 572 WD* 04 44 50.1073023840 +39 15 18.446225652 16.5 17.1 17.28 17.5 17.5 DA3.5 8 0
30 Lan 18 WD* 18 47 39.0288030792 +01 57 35.449794216 11.68 12.73 12.94 13.1 12.3 DA1.7 81 0
31 Lan 19 WD* 19 33 49.9589015424 +18 52 03.072218844   15.4 15.54 15.7 15.8 DA1 7 0
32 HD 350426 HS* 19 43 31.2053563008 +18 24 34.651848456 10.63 11.81 12.34 12.30 12.7 sdO 41 0
33 Lan 21 PN 19 44 59.1363580440 +22 45 47.753614368   15.4 15.77 16.2 17.4 DA1 14 0
34 Lan 22 WD* 20 00 21.6799152672 +19 07 41.093430312   15.2 15.02 14.8 14.9 DA3.5 6 0
35 Lan 356 WD* 20 24 32.8699041504 +41 23 38.718139128 16.6 17.3 17.21 17.1 17.6 DA2.5 9 0
36 KPD 2046+3940 WD* 20 48 08.1852945936 +39 51 37.337973588 12.90 14.10 14.43 14.5 14.2 DA.8 24 0
37 Lan 364 WD* 20 56 37.2773297664 +43 13 25.024775988 16.8 17.8   16.5 15.9 DZ 11 0
38 Lan 367 WD* 21 04 02.8269075456 +42 47 02.295167748 15.2 16.8 16.75 16.7 16.7 DA2 11 0
39 Lan 401 * 21 16 59.3760790536 +60 40 31.369581768 11.5 13.29 12.70 12.55 12.0 F5V 4 0
40 Lan 406 * 21 24 44.9279607384 +60 35 18.132982368 12.3 13.51 12.75 12.61 11.9 F6V 4 0
41 Ross 198 WD* 21 26 25.4551562735 +55 13 32.384210533 14.19 14.88 14.75 15.0 14.8 DA3.6 66 0
42 Lan 403 WD* 21 33 14.5281234648 +60 48 30.535123896 16.7 17.7 17.70 17.7   DA2.5 8 0
43 Lan 423 * 21 42 14.6937014280 +58 54 01.607868504 16.1 15.96 15.26 15.40 14.2 sdF5 4 0
44 Lan 432 WD* 21 58 32.6226087888 +58 04 31.771345980 17.9 17.4   17.2 16.9 DA 13 1
45 Lan 459 WD* 22 05 38.1835249296 +62 24 35.043752304 15.2 17.1 17.28 17.4 17.7 DA1.5 9 0
46 Lan 126 WD* 23 39 10.6622921904 +66 51 45.163490832 18.7 16.8 17.03 17.3 18.2 DA4 8 0

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