Photometric and H$α$ observations of LSI+61303: detection of a $\sim$26 day V and JHK band modulation

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dc.creatorParedes, J. M.
dc.creatorMarziani, P.
dc.creatorMarti, J.
dc.creatorFabregat, J.
dc.creatorCoe, M. J.
dc.creatorEverall, C.
dc.creatorFigueras, F.
dc.creatorJordi, C.
dc.creatorNorton, A. J.
dc.creatorPrince, T.
dc.creatorReglero, V.
dc.creatorRoche, P.
dc.creatorTorra, J.
dc.creatorUnger, S. J.
dc.creatorZamanov, R.
dc.date1994-02-07
dc.date.accessioned2026-07-07T02:19:04Z
dc.date.available2026-07-07T02:19:04Z
dc.descriptionWe present new optical and infrared photometric observations and high resolution H$α$ spectra of the periodic radio star \lsi. The optical photometric data set covers the time interval 1985-1993 and amounts to about a hundred nights. A period of $\sim$26 days is found in the V band. The infrared data also present evidence for a similar periodicity, but with higher amplitude of variation (0\rmag 2). The spectroscopic observations include 16 intermediate and high dispersion spectra of \lsi\ collected between January 1989 and February 1993. The H$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\ 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.
dc.description9 pages, LaTeX file. Figures available on request from josepmp@mizar.ub.es
dc.identifierhttps://arxiv.org/abs/astro-ph/9402016
dc.identifierhttp://arxiv.org/abs/astro-ph/9402016
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/9724
dc.subjectAstrophysics
dc.titlePhotometric and H$α$ observations of LSI+61303: detection of a $\sim$26 day V and JHK band modulation
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