The Masses of the O-type Binary 15 Monocerotis - Cont.

Details The Masses of the O-type Binary 15 Monocerotis - Cont. The Masses of the O-type Binary 15 Monocerotis - Cont.

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8392g&link_type=abstract

HST Proposal ID #8392

Astronomy and Astrophysics

Astronomy

Hst Proposal Id #8392

Scientific paper

The O-type star 15 Mon {HD 47839} was recently discovered to be a speckle and spectroscopic binary with an orbital period of 25 years. An analysis of both the radial velocity curve and astrometric orbit yields the masses of the components and distance to the system. The determination of this "orbital parallax" will be supplemented by FGS Astrometric observations of the binary system relative to nearby reference stars that are also observable in the FGS FOV. This will lead to a determination of the mass of each component. Both radial velocity and astrometric measurements are scant at present, but the system is now close to periastron and continued spectroscopic and astrometric monitoring will lead to a definitive orbit and yield important information about the masses of O-type stars. FGS measurements of separation, position angle, and magnitude difference {begun in Cycle 5} are needed to bridge the gap between current speckle observations and the new generation of optical interferometers.

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