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HD 115781 and HD 116204—two RS CVn binaries
Fekel, Francis C.; Griffin, R. F.
HD 115781 and HD 116204 (BL CVn and BM CVn) are shown to be RS CVn binaries with periods near 20 days. HD 115781 is double-lined; the primary type is about K1III, while the secondary is probably a late-type subgiant. The masses of the two components are equal within observational error. There is substantial photometric variability with a period ha…
Ultraviolet Variability of HD62001 - the Central Star of the Missing Nebula VORONTSOV-VELYAMINOV1-7
Rao, N. K.; Gilra, D. P.
IUE observations of HD 62001 do not confirm the ultraviolet variability of 0.15 mag seen from the ANS observations. These intriguing variations in ANS observations seem to be caused by a nearby (∼ 70 arcsec away) B star getting in and out of the field of view of the telescope, which had a jitter of 20 arcsec. There seems to be no evidence for the …
Ultraviolet Observations of the Hydrogen Deficient Variable Star Mv-Sagittarii
Nandy, K.; Rao, N. K.
IUE observations of the hydrogen-deficient irregular variable star MV Sgr obtained in 1980 June-October and also in 1979 November are discussed. These observations show a prominent λ 2200 absorption feature. A value ofE(B — V) = 0.55 is deduced from the strength of λ 2200 band assuming that this absorption is caused by interstellar medium. The der…