A Spectroscopic Orbit for the O8 If Star 9 SGE

Details A Spectroscopic Orbit for the O8 If Star 9 SGE A Spectroscopic Orbit for the O8 If Star 9 SGE

Jun 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995pasp..107..513u&link_type=abstract

Publications of the Astronomical Society of the Pacific, v.107, p.513

Astronomy and Astrophysics

Astronomy

5

Binaries: Spectroscopic, Stars: Individual: 9Sge

Scientific paper

We performed a period search of the 109 published radial velocities of 9 Sge (HD 188001) obtained since 1921 and found a dominant period of 78.74 day plus its first harmonic. We confirm earlier suggestions that the O8 If star 9 Sge is an SB1 binary of small amplitude (K ~ 11 km s ^-1). Our improved set of orbital elements indicate the companion may be a small star whose mass is probably in the range 1.2 - 1.9 solar mass. This permits a non-degenerate dwarf companion as early as A-type, which would not be detectable in contrast with the bright primary star. (SECTION: Stars)

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