Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21343306t&link_type=abstract
American Astronomical Society, AAS Meeting #213, #433.06; Bulletin of the American Astronomical Society, Vol. 41, p.302
Astronomy and Astrophysics
Astronomy
2
Scientific paper
Results are presented for a pro-am collaboration in the study of a newly-discovered, small-amplitude, Cepheid variable, HDE 344787 (BD+22°3786), that displays remarkably similar properties to Polaris, with interesting additional features. The 9th magnitude star is a F9 Ib supergiant spatially coincident with the young cluster NGC 6823, but not physically associated with it. HDE 344787 displays sinusoidal light variations in V at periods of both 5.4 and 3.8 days, corresponding to canonical fundamental mode and overtone pulsation, with the overtone signal the stronger of the two. The light variations are detected in observations dating from 1891 to 2008, during which interval the light amplitude decreased from 0.03 in V circa 1900 to a millimag level at present. The dominant signal is detected in both photometric and radial velocity measures. The Cepheid is undergoing a very rapid period increase, consistent with a first crossing of the instability strip. But the rapid rate of decrease in light amplitude forebodes a possible cessation of pulsation in the near future.
English Darlene A.
Huziak Richard
Lane David J.
Majaess Daniel J.
Percy John R.
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