A search for binaries among short-period southern Cepheids

Details A search for binaries among short-period southern Cepheids A search for binaries among short-period southern Cepheids

Dec 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981rmxaa...6..103g&link_type=abstract

(International Astronomical Union, Reunion Regional Latinoamericana de Astronomia, 2nd, Merida, Venezuela, Jan. 19-23, 1981) Rev

Astronomy and Astrophysics

Astronomy

Binary Stars, Cepheid Variables, Radial Velocity, Stellar Spectrophotometry, Ubv Spectra, Astronomical Spectroscopy, B Stars, Companion Stars, Electrophotometry, Southern Sky, Stellar Magnitude

Scientific paper

Fifteen southern Cepheids with 3-7 day periods have been subjected to simultaneous radial velocity and UBV(RI)-KC photometric observations. A comparison of the resulting radial velocity curves with earlier data confirms the binary nature of V 350 Sgr, and indicates that RTrA, AP Sgr and V 496 Aql are binary as well. The lack of significant spectroscopic distinction between the binary and nonbinary Cepheids implies that the companion stars to the binary ones are neither very luminous nor able to alter Cepheid photometric properties. Doubts are raised concerning the reliability of the U-B versus B-V diagram open loop method results obtained for the case of small loop openings. The variable-gamma velocity method is more reliable for Cepheid binary searches.

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