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Title: Photometric and Halpha observations of LSI+61·303: detection of a 26 day V and JHK band modulation
Author: Paredes i Poy, Josep Maria
Marziani, P.
Martí Ribas, Josep
Fabregat, Jaime
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.
Keywords: Estels
Estels binaris de raigs X
Astronomia de raigs X
X-ray binaries
X-ray astronomy
Issue Date: 1994
Publisher: Springer Verlag
Abstract: 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.
Note: Versió postprint del document publicat en paper
It is part of: Astronomy and Astrophysics, 1994, vol. 288, p. 519-528
ISSN: 0004-6361
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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