Details

Autor(en) / Beteiligte

• Casares, J.
• Ribas, I.
• Paredes, J. M.
• Martí, J.
• Allende Prieto, C.

Titel

Orbital parameters of the microquasar LS I +61 303

Ist Teil von

• Monthly notices of the Royal Astronomical Society, 2005-07, Vol.360 (3), p.1105-1109

Ort / Verlag

Oxford, UK: Blackwell Science Ltd

Erscheinungsjahr

2005

Link zum Volltext

Quelle

Wiley Online Library

Beschreibungen/Notizen

• New optical spectroscopy of the high-mass X-ray binary microquasar LS I +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 d after the compact star passage. The spectrum of the optical star is consistent with a B0 V spectral type and contributes ~65 per cent of the total light, the remainder being the result of emission by a circumstellar disc. We also measure the projected rotational velocity to be v sin i≃ 113 km s−1.