Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.6015h&link_type=abstract
American Astronomical Society, AAS Meeting #211, #60.15; Bulletin of the American Astronomical Society, Vol. 39, p.845
Astronomy and Astrophysics
Astronomy
Scientific paper
A comprehensive study of the 4.875-day classical Cepheid CF Cas was carried out using over a century of photometry. CF Cas is an important star because of its membership in the young open galactic cluster, NGC 7790, whose age and distance are reliably known. In addition to CF Cas, this cluster also contains two additional classical Cepheids (CE Cas A+B). Catalogued photometry has been reanalyzed and combined with two years of UBVRI photoelectric photometry obtained by us during 2003-2005. We investigate the possibility of secular (possible evolutionary) changes in the star's physical and pulsation characteristics. Variations are investigated by analyzing the mean brightness and light amplitude derived from the more accurate photoelectric data from 1958 onwards, as well as carrying out a new period study. The results indicate that a small, but measurable, decrease in the star's luminosity may be occurring ( 0.03 mag/50-yr). Possible changes in the light amplitude may be occurring, but they do not appear to be systematic. It should be noted that small season-to-season changes appear to be present. The period study revealed no evidence for significant period variations over the last hundred years, but our study resulted in improved period and light elements determination. Also photometry of the 6.0-d eclipsing binary cluster member, QX Cas (B0V+ B1V), reveals that this binary no longer shows eclipses. This probably has resulted from changes in its orbital inclination caused by perturbations from a tertiary companion. HST/ACS observations of the Cepheids and QX Cas were also made and the results are discussed.
This research is supported by grants from NSF/RUI AST-0507536 & NASA Grant HST-GO-10116-011 which we gratefully acknowledge.
Carton J.
Engle Scott
Guinan Edward
Hernandez Amanda
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