C.D.S. - SIMBAD4 rel 1.7 - 2020.02.23CET17:46:28

2010A&A...520A..73H - Astronomy and Astrophysics, volume 520, A73-73 (2010/9-2)

V945 Centauri = HD 112409: a bright hot short-period binary in a triple system?


Abstract (from CDS):

A detailed analysis of multicolour Geneva photometry and high-resolution echelle spectroscopy of the B8.5V star V945 Cen (HD112409, V=5.2m) whose short-term periodic variability was first detected from the HIPPARCOS data, led to the finding that the object is an ellipsoidal variable and a close double-lined spectroscopic binary with a 0.6496d orbital period and a circular orbit. The components have spectral types B7 and B8.5 and are both main-sequence objects. The system is detached but close to a contact configuration and is observed at an inclination of ∼23-24°. A notable finding is that the optical spectrum also contains a third system of spectral lines corresponding to a late B spectral type that remained stationary during the 5 days of spectral observations. From several independent lines of reasoning, we tentatively conclude that the third spectrum belongs to a real third body in the system. However, the possibility that it instead originates in circumbinary gas cannot be excluded completely, and additional spectral and interferometric observations are required to help us determine its origin conclusively.

Abstract Copyright:

Journal keyword(s): binaries: close - stars: variables: general - stars: individual: V945 Cen = HD112409

VizieR on-line data: <Available at CDS (J/A+A/520/A73): table1.dat>

Simbad objects: 4

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Number of rows : 4

N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
1 V* DW Car Al* 10 43 10.0816952047 -60 02 11.743736924 9.02 9.83 9.85 10.03 9.59 B1III 62 0
2 HD 106419 * 12 14 49.3158418289 -71 32 03.415098258   8.44 8.30     B9III 13 0
3 * H Cen Pu* 12 57 04.3522804071 -51 11 55.512963655   5.088 5.159     B2IV 51 1
4 HD 121190 Pu* 13 55 12.1418794262 -52 09 38.953997739 5.33 5.63 5.71     B9V 66 0

    Equat.    Gal    SGal    Ecl

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