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HD 98099


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Toward an Orbit for the High-Luminosity Cepheid T Monocerotis
We have obtained new velocities of the long-period Cepheid T Mon fromthe ground and velocities of its hot companion with the Hubble SpaceTelescope (HST) and the International Ultraviolet Explorer (IUE).Although observations do not cover a full orbit, both the maximum andminimum orbital velocities have now been obtained. We present apreliminary orbit and discuss the uncertainties in the orbitalparameters. The velocities for the companion appear to be inconsistentwith binary orbital motion, and it is likely that the companion isitself a binary in a short-period orbit. The HST spectrum of thecompanion shows that it is a chemically peculiar star, probablymagnetic. Because it is coupled with the more massive Cepheid, it mustbe very close to the zero-age main sequence. The well-determined massfunction from the preliminary orbit implies that the inclination of thelong-period system is close to 90 deg.

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Observation and Astrometry data

Constellation:Grande Ourse
Right ascension:11h17m20.03s
Declination:+34°50'38.3"
Apparent magnitude:9.02
Proper motion RA:-6
Proper motion Dec:3.6
B-T magnitude:10.423
V-T magnitude:9.136

Catalogs and designations:
Proper Names
HD 1989HD 98099
TYCHO-2 2000TYC 2522-2173-1
USNO-A2.0USNO-A2 1200-06687390
HIPHIP 55143

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