2018A&A...613A..26S


Query : 2018A&A...613A..26S

2018A&A...613A..26S - Astronomy and Astrophysics, volume 613A, 26-26 (2018/5-1)

New nearby white dwarfs from Gaia DR1 TGAS and UCAC5/URAT.

SCHOLZ R.-D., MEUSINGER H. and JAHREISS H.

Abstract (from CDS):

Aims. Using an accurate Tycho-Gaia Astrometric Solution (TGAS) 25 pc sample that is nearly complete for GK stars and selecting common proper motion (CPM) candidates from the 5th United States Naval Observatory CCD Astrograph Catalog (UCAC5), we search for new white dwarf (WD) companions around nearby stars with relatively small proper motions. Methods. To investigate known CPM systems in TGAS and to select CPM candidates in TGAS+UCAC5, we took into account the expected effect of orbital motion on the proper motion and proper motion catalogue errors. Colour-magnitude diagrams (CMDs) MJ/J-Ks and MG/G-J were used to verify CPM candidates from UCAC5. Assuming their common distance with a given TGAS star, we searched for candidates that occupied similar regions in the CMDs as the few known nearby WDs (four in TGAS) and WD companions (three in TGAS+UCAC5). The CPM candidates with colours and absolute magnitudes corresponding neither to the main sequence nor to the WD sequence were considered as doubtful or subdwarf candidates. Results. With a minimum proper motion of 60mas/yr, we selected three WD companion candidates; two of which are also confirmed by their significant parallaxes measured in URAT data, whereas the third may also be a chance alignment of a distant halo star with a nearby TGAS star that has an angular separation of about 465 arcsec. One additional nearby WD candidate was found from its URAT parallax and GJKs photometry. With HD 166435 B orbiting a well-known G1 star at ~=24.6pc with a projected physical separation of ~=700AU, we discovered one of the hottest WDs, classified by us as DA2.0±0.2, in the solar neighbourhood. We also found TYC 3980-1081-1 B, a strong cool WD companion candidate around a recently identified new solar neighbour with a TGAS parallax corresponding to a distance of ~=8.3pc and our photometric classification as ~= M2 dwarf. This raises the question of whether previous assumptions on the completeness of the WD sample to a distance of 13pc were correct.

Abstract Copyright: © ESO 2018

Journal keyword(s): astrometry - parallaxes - proper motions - binaries: general - white dwarfs - solar neighborhood

Simbad objects: 41

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Number of rows : 41
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 EGGR 169 WD* 04 25 53.7275747770 +12 11 48.335004184   15.96 15.44 15.54 14.77 DA8 45 0
2 HD 283750B WD* 04 36 44.8958962446 +27 09 51.523656552   16.46   15.4   DC8 86 1
3 HD 283750 BY* 04 36 48.2413370074 +27 07 55.898311812   9.354   7.4   K2.5Ve 259 2
4 HD 35650 Ro* 05 24 30.1697133942 -38 58 10.746312369 11.54 10.365 9.054 8.293 7.577 K6V 74 0
5 UCAC2 14975198 PM* 05 25 00.5135558128 -39 03 12.554681098   16.08 15.29 15.11   ~ 1 1
6 2MASS J05325346+8246465 BD* 05 32 54.4385958315 +82 46 45.174215154           esdL7 55 0
7 UCAC2 5496091 PM* 06 23 31.4663787205 -59 52 44.711434823       14.61   ~ 1 0
8 G 107-69 PM* 07 30 42.7784290757 +48 11 58.590735844   15.21   13.0   M4V 55 0
9 EGGR 52 ** 07 30 47.30952 +48 10 26.6124 16.01 15.61   14.4   DA+DA 93 0
10 EGGR 321 WD* 07 33 30.8802655625 +64 09 27.435472901   16.4   15.6   DA11P 43 0
11 BD-02 2198 PM* 07 36 07.0798477777 -03 06 38.791356409 12.551 11.347 9.871 8.925 7.891 M1.0V 45 0
12 HD 61606 BY* 07 39 59.3285412183 -03 35 51.026043193 8.89 8.136 7.169 6.626 6.15 K3V 169 0
13 HD 61606B PM* 07 40 02.9014152864 -03 36 13.228961430   10.26 8.93 8.09 7.34 K7V 50 1
14 SCR J0753-2524 WD* 07 53 56.6183605917 -25 24 01.481048465   16.18   15.25 15.67 DA10 15 0
15 CD-24 6144 PM* 07 54 10.8827709147 -25 18 11.420592819 12.286 11.107 9.715 8.845 8.029 M0 39 0
16 BD+10 1857 ** 08 42 44.5331 +09 33 24.119 12.415 11.093 9.629 8.711 7.772 M1V 92 0
17 G 46-2 PM* 08 42 52.2285828953 +09 33 11.175358045 14.527 13.18 11.800 10.74 9.418 M2.5Ve 67 0
18 HD 75632 ** 08 55 24.818472 +70 47 39.17616   10.376   7.8   M1V+M1V 114 0
19 SSSPM J1013-1356 LM* 10 13 07.3466815701 -13 56 21.261098713       18.73 16.01 sdM9.5 35 0
20 LAWD 37 WD* 11 45 42.9170659451 -64 50 29.464090822 11.08 11.725 11.513 11.34 11.163 DQ 240 0
21 2MASS J16262034+3925190 BD* 16 26 20.1331562643 +39 25 19.489643721       19.67 16.68 esdL4 44 0
22 V* DN Dra WD* 16 48 25.6321433630 +59 03 22.663406299   12.34 12.17 12.44   DA4.0 200 0
23 HD 153525 BY* 16 57 42.2281896066 +47 21 43.714396845       7.3   K3V 92 0
24 HD 153557 BY* 16 57 53.1788017484 +47 22 00.062106840   8.80 7.82 8.49   K3V 92 0
25 HD 153557B PM* 16 57 53.6142619066 +47 22 02.438137286   12.086   10.1   M1.5Ve 31 0
26 HD 166435B WD* 18 09 19.4570817876 +29 57 20.847660738       13.33   DA2.2 4 0
27 HD 166435 PM* 18 09 21.3817906855 +29 57 06.165674208   7.457 6.829     G1IV 173 0
28 UCAC4 685-062476 WD* 18 31 58.7217398276 +46 58 28.978692478       15.11   DA 3 0
29 HD 173739 PM* 18 42 46.7048533410 +59 37 49.411785651   10.782   8.1   M3V 342 1
30 HD 173740 PM* 18 42 46.8942178098 +59 37 36.723092516   11.705   8.9   M3.5V 298 1
31 LAWD 74 WD* 19 20 34.9229875534 -07 40 00.066805378 11.553 12.345 12.290 12.229 12.164 DBQA5 205 0
32 * 16 Cyg A ** 19 41 48.9539315338 +50 31 30.218780803 6.79 6.59 5.95 5.50 5.17 G1.5Vb 693 1
33 * 16 Cyg B PM* 19 41 51.9731830550 +50 31 03.086127222 7.07 6.86 6.20 5.76 5.42 G3V 815 1
34 HD 340611 WD* 20 34 21.8849808924 +25 03 49.749569866 10.687 11.471 11.546 11.648 11.728 DA2.4 290 0
35 EGGR 261 WD* 20 49 06.6997831624 +37 28 14.051804868   13.40   13.2   DA3.4 62 0
36 EGGR 378 WD* 21 18 56.2637318943 +54 12 41.241940564 11.76     12.9   DA3.4 88 1
37 IRAS 21500+5903 PM* 21 51 38.3194245194 +59 17 39.867862225   11.88 10.64     ~ 13 0
38 UCAC4 747-070768 WD* 21 51 40.1078128269 +59 17 34.854269519       14.51   DAH 7 1
39 EGGR 150 WD* 21 52 25.3788480672 +02 23 19.576520492 11.942 12.732 12.743 12.839 12.938 DA2.8 171 0
40 WG 39 WD* 21 57 38.3567407855 -51 00 31.522186463   14.94 14.73 14.53   DQ7 66 0
41 CD-51 13128 Er* 21 57 41.2038459151 -51 00 22.240381058 12.968 12.008 10.487 9.416 8.101 M2Ve 76 0

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2021.08.01-22:08:05

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