2004A&A...418..275A


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.22CEST05:28:58

2004A&A...418..275A - Astronomy and Astrophysics, volume 418, 275-281 (2004/4-4)

Discovery of a spectroscopic binary comprising two hot helium-rich subdwarfs.

AHMAD A., JEFFERY C.S. and FULLERTON A.W.

Abstract (from CDS):

Helium-rich subdwarf B (He-sdB) stars form a very small fraction of the population of hot subdwarf stars in our Galaxy. They have been found both in the field of our Galaxy as well as in globular clusters. The evolution of these rare stars has recently been the subject of much debate involving both binary and single star evolution models. We report our serendipitous discovery that the prototype - PG 1544+488 - is a binary containing two low-mass helium-rich hot subdwarfs. This discovery challenges existing evolutionary models for He-sdB stars and suggests that they may be formed through close binary evolution and following the ejection of a common envelope.

Abstract Copyright:

Journal keyword(s): stars: chemically peculiar - stars: early-type - stars: subdwarfs - stars: individual: PG 1544+488 - fundamental parameters - stars: binaries: spectroscopic stars:

Simbad objects: 7

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Number of rows : 7

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 Ton S 313 HS* 03 03 43.9022438235 -30 27 47.663892176           sdB 10 0
2 LB 1766 HS* 04 59 18.7826339379 -53 52 54.591217752 10.88 12.25 12.91     sdBHe 13 0
3 HD 128220 SB* 14 35 15.7846989338 +19 12 54.511945549   8.724 8.503     G0IIIn+sdO 109 0
4 PG 1544+488 HS* 15 46 11.6932759584 +48 38 37.226255710   12.52 12.79 13.08   sdBC1VIIpHe39 36 1
5 HD 185510 RS* 19 39 38.8187463380 -06 03 49.460823987   9.44 8.235   6.967 K0III+sdB 103 0
6 HD 188112 HS* 19 54 31.4192112333 -28 20 20.679022097   10.01 10.22     sdB 79 0
7 JL 87 HS* 21 48 37.7347483725 -76 20 44.615921478 11.04 11.96 12.07     sdBHe 29 0

    Equat.    Gal    SGal    Ecl

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2020.10.22-05:28:58

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