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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|
Martí Ribas, Josep
Coe, M. J.
Figueras Siñol, Francesca
Jordi i Nebot, Carme
Norton, A. J.
Torra Roca, Jorge
Unger, S. J.
Zamanov, R. K.
Estels binaris de raigs X
Astronomia de raigs X
|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|
|Appears in Collections:||Articles publicats en revistes (Física Quàntica i Astrofísica)|
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