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Title: Orbital parameters of the microquasar LSI+61303
Author: Casares, J.
Ribas Canudas, Ignasi
Paredes i Poy, Josep Maria
Martí Ribas, Josep
Allende-Prieto, C.
Keywords: Raigs X
Issue Date: 1-Jul-2005
Publisher: Royal Astronomical Society
Abstract: New optical spectroscopy of the HMXB microquasar LSI +61 303 is presented. Eccentric orbital fits to our radial velocity measurements yield updated orbital parameters in good agreement with previous work. Our orbital solution indicates that the periastron passage occurs at radio phase 0.23 and the X-ray/radio outbursts are triggered 2.5--4 days after the compact star passage. The spectrum of the optical star is consistent with a B0 V spectral type and contributes ~65 percent of the total light, the remaining due to emission by a circumstellar disc. We also measure the projected rotational velocity to be v sin i = 113 km/s.
Note: Reproducció del document publicat a:
It is part of: Monthly Notices of the Royal Astronomical Society, 2005, vol. 360, num. 3, p. 1105-1109
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ISSN: 0035-8711
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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