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HD 123720


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Radial Velocity Studies of Southern Close Binary Stars. I. Winter Systems
Radial velocity measurements and sine-curve fits to the orbital velocityvariations are presented for nine contact binaries: V1464 Aql, V759 Cen,DE Oct, MW Pav, BQ Phe, EL Aqr, SX Crv, VZ Lib, and GR Vir. For thefirst five of these, our observations are the first available radialvelocity data. For the three remaining radial velocity variables, CE Hyiis a known visual binary, while CL Cet and V1084 Sco are suspected to bemultiple systems in which the contact binary is spectrally dominated byits companion (which itself is a binary in V1084 Sco). Five additionalvariable stars, V872 Ara, BD Cap, HIP 69300, BX Ind, and V388 Pav, areof unknown type, but most are pulsating stars; we give their mean radialvelocities and Vsini.Based on data obtained at the European Southern Observatory.

True and Possible Contact Binaries in the Hipparcos Catalogue
A comprehensive list of contact binaries included in the HIPPARCOScatalogue is given.

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Observation and Astrometry data

Constellation:Centaurus
Right ascension:14h11m02.78s
Declination:-55°26'51.7"
Apparent magnitude:7.758
Distance:170.648 parsecs
Proper motion RA:-15.6
Proper motion Dec:-9.9
B-T magnitude:8.032
V-T magnitude:7.781

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 123720
TYCHO-2 2000TYC 8669-2924-1
USNO-A2.0USNO-A2 0300-20573664
HIPHIP 69300

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