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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 Astrofísica Stars X-ray binaries X-ray astronomy Astrophysics |
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 |
URI: | http://hdl.handle.net/2445/45406 |
ISSN: | 0004-6361 |
Appears in Collections: | Articles publicats en revistes (Física Quàntica i Astrofísica) |
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