2018A&A...619A..31S


Query : 2018A&A...619A..31S

2018A&A...619A..31S - Astronomy and Astrophysics, volume 619A, 31-31 (2018/11-1)

Spectroscopic classification and Gaia DR2 parallaxes of new nearby white dwarfs among selected blue proper motion stars.

SCHOLZ R.-D., MEUSINGER H., SCHWOPE A., JAHREISS H. and PELISOLI I.

Abstract (from CDS):


Aims. With our low-resolution spectroscopic observing programme for selected blue proper motion stars, we tried to find new white dwarfs (WDs) in the solar neighbourhood.
Methods. We used the Lepine & Shara Proper Motion (LSPM) catalogue with a lower proper motion limit of 150mas/yr and the Second US Naval Observatory CCD Astrograph Catalog (UCAC2) for proper motions down to about 90mas/yr. The LSPM and UCAC2 photometry was combined with Two Micron All Sky Survey (2MASS) near-infrared (NIR) photometry. Targets selected according to their blue optical-to-NIR and NIR colours were observed mainly at Calar Alto. The spectra were classified by comparison with a large number of already known comparison objects, including WDs, simultaneously observed within our programme. Gaia DR2 parallaxes and colours were used to confirm or reject spectroscopic WD candidates and to derive improved effective temperatures.
Results. We found ten new WDs at distances between 24.4pc and 79.8pc, including six hot DA WDs: GD 221 (DA2.0), HD 166435 B (DA2.2), GD 277 (DA2.2), 2MASS J19293865+1117523 (DA2.4), 2MASS J05280449+4105253 (DA3.6), and 2MASS J05005185-0930549 (DA4.2). The latter is rather bright (G ≈12.6) and with its Gaia DR2 parallax of ∼14mas it appears overluminous by about 3mag compared to the WD sequence in the Gaia DR2 colour-magnitude diagram. It may be the closest extremely low mass (ELM) WD to the Sun. We further classified 2MASS J07035743+2534184 as DB4.1. With its distance of 25.6pc it is the second nearest known representative of its class. With GD 28 (DA6.1), LP 740-47 (DA7.5), and LSPM J1919+4527 (DC10.3) three additional cool WDs were found. Gaia DR2 parallaxes show that four of our candidates, but also two previously supposed WDs (WD 1004+665 and LSPM J1445+2527) are in fact distant Galactic halo stars with high tangential velocities. Among our rejected WD candidates, we identified a bright (G=13.4 mag) G-type carbon dwarf, LSPM J0937+2803, at a distance of 272pc.

Abstract Copyright: © ESO 2018

Journal keyword(s): techniques: spectroscopic - surveys - parallaxes - proper motions - white dwarfs - solar neighborhood

Status at CDS : Objects in title, abstract, text, figures, and all or part of small table(s) being processed in SIMBAD.

Simbad objects: 59

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Number of rows : 59
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 EGGR 459 WD* 00 22 15.1872356718 +42 36 42.154455502   17.22   16.6   DC9 23 0
2 LP 525-21 WD* 00 27 36.6278649600 +05 42 03.130213593   17.2   15.6   DA 14 0
3 EGGR 245 WD* 00 41 22.0414216378 +55 50 08.351549381 13.30 14.11 14.05 14.3   DBQ5 52 0
4 EGGR 7 WD* 01 03 49.9225512196 +05 04 30.568726390   14.24   13.7   DA5.9 88 0
5 Feige 11 HS* 01 04 21.6747168600 +04 13 37.054495956 10.847 11.826 12.065 12.183 12.324 sdB2VIHe4 116 0
6 GD 277 WD* 01 29 23.9944689552 +51 08 46.968374976 12.525 13.431 13.536 13.640 13.749 DA 8 0
7 GD 1053 HS* 01 56 31.8993527208 -13 54 26.457259860   12.2   12.63 12.40 sdOB 15 0
8 GD 28 PM* 02 28 40.9794313104 +36 45 40.425194952   15.6   15.4   ~ 10 0
9 ATO J047.0757+51.6698 WD* 03 08 18.1872977040 +51 40 11.623716948   16.70 15.54 15.32   DAZ 7 0
10 G 77-61 Pe* 03 32 38.0920129269 +01 58 00.084645962   15.60 13.90 12.9   dC-J_CH5 129 0
11 LP 413-40 WD* 03 45 16.8306937296 +17 48 08.702047980   17.1   16.3   DA 67 0
12 LP 593-56 WD* 03 47 06.8255317424 +01 38 47.638115913   16.7 16.52 15.8 15.54 DQ9 19 0
13 GD 429 WD* 04 21 27.8797089792 +70 14 19.366567548   14.85   15.0   DA4.1 25 0
14 G 84-26 WD* 04 59 43.2138583272 -00 22 38.863005456   15.8       DA4.4 19 0
15 UCAC4 403-007522 SB* 05 00 51.8513069376 -09 30 55.094669244   12.68 12.57 12.74   DELM 4 0
16 2MASS J05280449+4105253 PM* 05 28 04.5044249952 +41 05 25.305898596           ~ 2 0
17 LSPM J0543+3637 WD* 05 43 07.3730859600 +36 37 01.208984772   16.0   15.5   DAZ 9 0
18 EGGR 248 WD* 05 51 19.4818569216 -00 10 21.107152956   15.06 14.60     DQ8P 142 0
19 GD 73 WD* 06 13 46.6042079928 +20 50 31.150003704           DA+DQ 14 0
20 UCAC4 578-037125 WD* 07 03 57.4256197368 +25 34 18.334144776   13.94 13.86 14.17   DBA 4 0
21 SDSS J075519.48+480034.0 WD* 07 55 19.4755767912 +48 00 34.060709988           DA 15 0
22 PM J08126+1737 WD* 08 12 37.8086204016 +17 37 01.426135080     13.46     DA 10 0
23 SDSS J091709.55+463821.8 WD* 09 17 09.5538167784 +46 38 21.666153876           DA 34 0
24 G 46-37 WD* 09 22 56.0652538752 +01 03 10.148001660   17.28 16.59 16.02   DAZ 12 0
25 LSPM J0937+2803 PM* 09 37 26.1410412792 +28 03 25.407137808   14.1   13.1   ~ 2 0
26 G 235-56 WD* 10 08 01.8259686552 +66 19 22.693683648   15.45   14.64   DZ 9 0
27 EGGR 350 WD* 10 23 09.0629848950 +63 27 41.489054140   15.09   14.6   DA7.3 57 0
28 PG 1032+406 HS* 10 35 16.5804370224 +40 21 14.417268660   11.38 11.81     sdB 37 0
29 LP 37-186 WD* 10 37 02.4755594097 +71 10 58.705020158   17.3   16.1   DC9 32 0
30 HS 1102+0934 WD* 11 04 36.7495773072 +09 18 22.842050364   16.9   16.5   DA 19 0
31 G 13-6 PM* 12 04 56.3008991352 +04 19 56.169669288   15.68   14.7   sd:G0: 6 0
32 LSPM J1341+0500 WD* 13 41 21.7979739274 +05 00 45.845359937   17.5   16.0   DC 12 0
33 LSPM J1409+3705 LM* 14 09 21.1572334992 +37 05 42.963432540   18.9   16.6   M0V 6 0
34 LP 740-47 WD* 14 43 18.1686903504 -14 37 15.312079344     16.37     DA 5 0
35 LSPM J1445+2527 WD* 14 45 39.4524742104 +25 27 15.913578312   16.8   15.5   DA 5 0
36 G 137-24 WD* 15 35 05.8098944592 +12 47 45.199307508   15.31   15.7   DZ 32 0
37 LSPM J1554+1939 PM* 15 54 16.8668687904 +19 39 51.163000668   17.9   16.3   ~ 2 0
38 2MASS J16345081+2610073 PM* 16 34 50.8217527128 +26 10 07.407677388           ~ 1 0
39 GD 362 WD* 17 31 34.3168718112 +37 05 20.711767812   16.3   16.4   DAZB 161 0
40 HD 166435B WD* 18 09 19.4568681528 +29 57 20.846410308       13.33   DA2.2 5 0
41 HD 166435 PM* 18 09 21.3816898440 +29 57 06.166145376   7.457 6.829     G1IV 178 0
42 Ross 137 WD* 18 27 13.0871903322 +04 03 46.788559039 13.383 13.981 13.889 13.928 13.958 DA+DC 73 0
43 LP 141-26 WD* 19 12 48.5664699696 +53 43 13.445464908   13.2   13.2   DA 12 0
44 G 142-B2B WD* 19 13 38.6751658464 +13 36 27.362642868 13.52     14.47   DA3.6 47 0
45 LSPM J1919+4527 PM* 19 19 36.2270049221 +45 27 43.551634295   17.7   16.3   ~ 4 0
46 LAWD 74 WD* 19 20 34.9229289504 -07 40 00.065957592 11.553 12.345 12.290 12.229 12.164 DBQA5 211 0
47 Ross 749 PM* 19 27 26.2432382064 +10 07 10.027884576   14.59 14.66 14.83   ~ 7 0
48 2MASS J19293859+1118050 NIR 19 29 38.5930342464 +11 18 05.014969596           ~ 1 0
49 UCAC4 507-103823 WD* 19 29 38.6504331648 +11 17 52.409146380       13.68   DA 4 0
50 EGGR 134 WD* 19 45 31.7610812568 +16 27 38.769146676   13.96   14.4   DA2.5 52 0
51 HD 340611 WD* 20 34 21.8847019255 +25 03 49.750446346 10.687 11.471 11.546 11.648 11.728 DA2.4 298 0
52 GD 392 WD* 21 00 21.5115115656 +34 26 20.995732788 14.89 15.73   15.6   DB5 40 0
53 G 188-27 WD* 21 49 54.5666278344 +28 16 59.591324712   15.1   14.5   DB4.5 41 0
54 IRAS 21500+5903 PM* 21 51 38.3194245194 +59 17 39.867862225   11.88 10.64     M3.9 15 0
55 EGGR 150 WD* 21 52 25.3789636654 +02 23 19.576176425 11.942 12.732 12.743 12.839 12.938 DA2.8 179 0
56 LP 287-39 WD* 22 17 47.6190906902 +37 07 50.922859738   17.7   16.2   DC 15 0
57 EGGR 155 WD* 22 49 05.5507896558 +22 36 31.991540832   14.55   13.8   DA4.7 94 0
58 LP 522-46 WD* 23 25 19.8723998499 +14 03 39.604529500   16.3 16.05 15.3 15.10 DA 28 0
59 EGGR 160 WD* 23 31 35.6606215200 +41 01 30.683471808   13.85   13.9   DA3.0 42 0

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2022.08.13-02:27:32

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