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Photometric and Halpha observations of LSI+61·303: detection of a 26 day V and JHK band modulation
Paredes i Poy, Josep Maria; Marziani, P.; Martí Ribas, Josep; Fabregat, J.; Coe, M. J.; Everall, C.; Figueras Siñol, Francesca; Jordi i Nebot, Carme; Norton, A. J.; Prince, T.; Reglero, V.; Roche, P.; Torra Roca, Jorge; Unger, S. J.; Zamanov, R. K.
Universitat de Barcelona
We present new optical and infrared photometric observations and high resolution H α spectra of the periodic radio star LSI+61◦303. The optical photometric data set covers the time interval 1985-1993 and amounts to about a hundred nights. A period of ∼26 days is found in the V band. The infrared data also present evidence for a similar periodicity, but with higher amplitude of variation ((0.m 2). The spectroscopic observations include 16 intermediate and high dispersion spectra of LSI+61◦303 collected between January 1989 and February 1993. The H α emission line profile and its variations are analyzed. Several emission line parameters -- among them the H α EW and the width of the H α red hump -- change strongly at or close to radio maximum, and may exhibit periodic variability. We also observe a significant change in the peak separation. The H α profile of LSI+61◦303 does not seem peculiar for a Be star. However, several of the observed variations of the H α profile can probably be associated with the presence of the compact, secondary star.
Estels
Estels binaris de raigs X
Astronomia de raigs X
Astrofísica
Stars
X-ray binaries
X-ray astronomy
Astrophysics
(c) Springer Verlag, 1994
Artículo
info:eu-repo/semantics/acceptedVersion
Springer Verlag
         

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