1999A&A...349L..34M


Query : 1999A&A...349L..34M

1999A&A...349L..34M - Astronomy and Astrophysics, volume 349, L34-36 (1999/9-1)

HD 30187 B and HD 39927 B: two suspected nearby hot subdwarfs in resolved binaries.

MAKAROV V.V. and FABRICIUS C.

Abstract (from CDS):

In doing a BT, VT photometric solution for close Hipparcos double stars, based on the observations with the Tycho instrument of the Hipparcos satellite, we discovered two very blue subluminous components of HD 30187 and HD 39927. The position of the components on an observational HR diagram implies their being sdO or sdB hot subdwarfs. The only previously known sdO component of a visual binary, HD 113001 B, is also confirmed by our photometric data. The two new candidate hot subdwarfs have parallaxes 8.25 and 10.17mas, respectively, and with angular separations of about 0.35arcsec, the orbital periods must be of the order of 100 years. This should make it possible to determine their masses from observation.

Abstract Copyright:

Journal keyword(s): stars: individual: HD 30187 B - stars: individual: HD 39927 B - stars: white dwarfs - stars: binaries: visual

Simbad objects: 8

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Number of rows : 8
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 HD 17576 Ro* 02 48 07.9314892776 -36 58 53.722194132   8.45 7.90 8.80 7.114 G1V 46 0
2 HD 30187 ** 04 42 10.3924157496 -56 07 07.830477156   8.48 8.03     F5V 21 0
3 HD 39911 * 05 55 24.8907463944 -04 49 32.241535500   7.18 7.06     A0/1IV/V 9 0
4 HD 39927 ** 05 55 35.3689202448 -04 47 18.908033964   6.315 6.264     A0V 26 0
5 HD 113001B HS* 13 00 26.175 +35 45 20.79   10.25 10.69     sdO 7 0
6 HD 113001 ** 13 00 26.19112 +35 45 20.2091   9.66 9.55     A4V 53 0
7 HD 149499 PM* 16 38 31.0567696032 -57 28 11.514036396   9.60 9.11 9.19 7.894 K0V 52 0
8 HD 149499B WD* 16 38 31.199 -57 28 10.70   11.12 11.26     DOZ1 101 0

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2022.05.24-18:01:20

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