Other
Scientific paper
May 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...180.2908v&link_type=abstract
American Astronomical Society, 180th AAS Meeting, #29.08; Bulletin of the American Astronomical Society, Vol. 24, p.774
Other
Scientific paper
Seven probable members of the Alpha Persei cluster have been monitored for variability with a CCD camera attached to the 0.6m Perkin telescope at Van Vleck Observatory on the campus of Wesleyan University. This is part of a larger effort directed by J. Stauffer and C. Prosser of CfA to determine rotation periods for stars in a number of clusters. Four of the program stars have v sin i > 60 km/sec and are termed "rapid rotators"; the other three have much lower values of v sin i. The three slow rotators in our sample (HE 828, AP 14, and AP 25) were observed on 20 to 25 nights each through a Cousin's R filter. Differential photometry with respect to field stars on the same CCD frames was done using the aperture photometry task in IRAF. All three stars appear to be variable but the amplitudes are less than 0.1 mag in two cases and less than 0.05 mag for AP 14. A search for the expected periodicity in the light curves is underway, so far without result. The rapid rotators were observed repeatedly over a six hour interval on two or three nights each, in addition to single observations obtained sporadically. The reduction process is not yet finished for these stars, but we can say that He 1151, a questionable member, showed no variation at the 0.02 magnitude level. He 373, on the other hand, appears to be variable at a level of about 0.05 mag. However, one of its comparison stars also appears variable, so a definite conclusion is not yet possible. Again, no periods have yet been determined but the analysis is not completed.
Herbst William
Vinton Gregory
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