Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.242..285s&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 242, Jan. 15, 1990, p. 285-288.
Astronomy and Astrophysics
Astronomy
17
Binary Stars, Cepheid Variables, Stellar Mass, Stellar Orbits, Astronomical Photometry, Centaurus Constellation, Orbital Elements, Periodic Variations, Sagittarius Constellation
Scientific paper
The value of the orbital period has been determined for three spectroscopic binary Cephieds. Assuming a circular orbit, XX Cen has an orbital period of 909.4 d, while that of V350 Sgr is 1129 d. These two stars have been suspected as spectroscopic binaries from earlier studies. The variable gamma-velocity of the third star, X Sgr, has escaped attention so far. X Sgr turned out to be a spectroscopic binary with an orbital period of 507.25 d, one of the shortest values among the known Cepheid binaries. Since a complete orbital cycle of these three Cepheids can be covered during 2-3 years of observations, radial velocity measurements need to be obtained in order to give a more accurate orbital solution, or in the case of X Sgr to provide the final proof for confirming the spectroscopic binary interpretation.
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