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Session 43 - Variable Stars.
Display session, Thursday, January 08
Bohlender, et. al. (Astron. Astrophys. 307, L9-12,1996) have found evidence of non-radial pulsation in the line profile variations of the Lambda Bootis Star, HD 111604. At their request we put this on the observing program of the Four College Consortium Automatic Photometric Telescope. In this paper we report on a preliminary analysis of approximately 140 Stromgren uvby observations obtained on ten nights during the 1996 and 1997 observing seasons. We also examined the archival Hipparchos photometry for this star as well as for our comparison (HD 112171) and check (HD 113797) stars. Both the Hipparchos and APT photometry indicate that HD 111604 is variable. The analysis of the APT data indicates that the program star is probably variable with a period of approximately 0.1 days and an amplitude of 10 - 15 millimagnitudes. This period may have changed between the first and second observing seasons. This work has been supported in part by NSF Grant 95-28906 to the College of Charleston and in part by a gr ant from the South Carolina Space Grant Consortium to the first author.
Program listing for Thursday