V441 Herculis (89 Herculis) and V814 Herculis (HD 161796) in 1991 and 1992

Details V441 Herculis (89 Herculis) and V814 Herculis (HD 161796) in 1991 and 1992 V441 Herculis (89 Herculis) and V814 Herculis (HD 161796) in 1991 and 1992

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993pasp..105..751f&link_type=abstract

Publications of the Astronomical Society of the Pacific, v.105, p.751

Astronomy and Astrophysics

Astronomy

3

Stars: Giant, Stars: Individual: V441 Herculis, Stars: Individual: V814 Herculis

Scientific paper

V441 Herculis (89 Herculis) and V814 Herculis (HD 161796) are among the best-known UU Herculis stars (high latitutde, often seemingly young, F supergiants). Most, if not all, members of hte class exhibit long-period, low amplitude light variability, which potentially could be a useful diagnostic in establishing the nature of these poorly understood stars. The periods, shaps, mean levels, and stability of the light curves and their relation to corresponding velocity curves all provide information on the type of pulsation, and the type of star. To this end, one of us (JDF) has a long-term program running on the Automatic Photoelectric Telesocpe Service, whereby UBV photometry of V441 Her and V814 Her is obtained on about 100 nights a year eventually for some ten years. The date are now being published every second year, and the program will conclude with ane xtensive analysis of the findings. This paper represents the fifth data report; the previous one was in Fernie 1991 and earlier ones are cited therein. A preliminary synoptic overview of results to 1991 is given in Fernie 1993. (SECTION: Stars)

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