A. Guarnieri, C. Bartolini, M. Teodorani, R. Silingardi, A. Piccioni
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Optical behavior of the Be‐X binary V635 CAS=4U0115+63 before and during a transient phase
The main results of the observations of the optical component of the Be‐X binary system V635 Cas, carried out at the Bologna Observatory in the period 1985–1990 are presented. Three kinds of variable features were prominent: i) photometric variations on a time‐scale of several days; ii) a strong increase in luminosity on a time‐scale of about one year; iii) an episodic inversion of the ratio of the equivalent widths of Hα and Fe ii 6153.
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