Other
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.6014b&link_type=abstract
American Astronomical Society, AAS Meeting #211, #60.14; Bulletin of the American Astronomical Society, Vol. 39, p.845
Other
Scientific paper
The short period Cepheid EU Tauri ( = HD38321 = HIP27183; V = 7.94) was on the observing program of the Four College Consortium APT for several years. We were observing it based on the suggestion that it was a multimode Cepheid. We obtained approximately 194 UBVRI observations on 112 nights from JD 2448276 through JD 2448988. When EU Tauri was shown to be pulsating in only one mode, both by our observations and those of others, this star was dropped from out observing program. Recently however it has been brought to our attention that short period, s-type Cepheids show period changes over relatively short time scales. We have combined our data with published data extending over 35 years and determined an average period from the entire data set of 2.10248 days. We then used this period to determine the Fourier coefficients for each data subsets in order to find any phase shifts between sets which would be indicative of a changing period. These phase shifts were indicative of such a period change. We also used both our data and a contemporaneous radial velocity set in an attempt to determine the radius of EU Tau. Finally EU Tauri has been returned to the APT observing program. Fall observations will be included in this presentation. This work has been supported by NSF Grants 86-116362, AST-91-15114, and AST-050755 to the College of Charleston.
Boyer Kirk
Dukes Robert J. Jr.
Lewandowski C.
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