J/A+A/520/A73 Light curve of V945 Cen in Geneva photometry (Harmanec+, 2010)
V945 Cen = HD 112409: a bright hot short-period binary in a triple system?
Harmanec P., Aerts C., Prsa A., Verhoelst T., Kolenberg K.
<Astron. Astrophys. 520, A73 (2010)>
=2010A&A...520A..73H 2010A&A...520A..73H
ADC_Keywords: Binaries, eclipsing ; Photometry, Geneva
Keywords: binaries: close - stars: variables: general -
stars: individual: V945 Cen = HD 112409
Abstract:
A detailed analysis of multicolour Geneva photometry and
high-resolution echelle spectroscopy of the B8.5V star V945 Cen
(HD 112409, V=5.2mag) 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.
Objects:
------------------------------------------------
RA (2000) DE Designation(s)
------------------------------------------------
12 57 04.35 -51 11 55.5 V945 Cen = HR 4913
------------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 53 167 Geneva 7-color photometry of V945 Cen
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 F11.3 d HJD Heliocentric Julian date
13- 17 F5.3 mag Vmag Geneva V magnitude
19- 23 F5.3 mag V1mag Geneva V1 magnitude
25- 29 F5.3 mag Bmag Geneva B magnitude
31- 35 F5.3 mag B1mag Geneva B1 magnitude
37- 41 F5.3 mag B2mag Geneva B2 magnitude
43- 47 F5.3 mag Umag Geneva U magnitude
49- 53 F5.3 mag Gmag Geneva G magnitude
--------------------------------------------------------------------------------
Acknowledgements:
Petr Harmanec, hec(at)sirrah.troja.mff.cuni.cz
(End) Patricia Vannier [CDS] 05-Jul-2010