AAS Meeting #194 - Chicago, Illinois, May/June 1999
Session 90. Cosmology and Dark Matter
Display, Thursday, June 3, 1999, 9:20am-4:00pm, Southwest Exhibit Hall

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[90.05] Cross-dispersion imaging of the classical Cepheid binary AW Per

D. Massa (Raytheon ITSS), N.R. Evans (Harvard CfA), A.S Endal (Science Applications Corp.)

The 6.4 day classical Cepheid AW Per is a spectroscopic binary with a period of 40 years. Using HST, we have determined the angular separation of the binary system. Although we currently have spatially resolved data for a single epoch in the orbit, the success of our approach opens the possibility of determining the inclination, \sin i, of the system if the measurements are repeated at additional epochs. Since the system is potentially a double lined spectroscopic binary, a determination of \sin i would provide the distance to the system and the masses of the components.

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