BINARIES: GENERAL; STARS: EARLY-TYPE; STARS: INDIVIDUAL: HD 93205; X-RAYS: STARS
Abstract :
[en] A new high-quality set of orbital parameters for the O-type spectroscopic binary HD 93205 has been obtained combining échelle and coudé CCD observations. The radial velocity orbits derived from the Heii lambda4686Å (primary component) and Hei lambda4471Å (secondary component) absorption lines yield semi-amplitudes of 133+/-2 and 314+/-2kms[SUP]-1[/SUP] for each binary component, resulting in minimum masses of 31 and 13M[SUB]solar[/SUB] (q=0.42). We also confirm for the binary components the spectral classification of O3V+O8V previously assigned. Assuming for the O8V component a `normal' mass of 22-25M[SUB]solar[/SUB] we would derive for the primary O3V a mass of `only' 52-60M[SUB]solar[/SUB] and an inclination of about 55° for the orbital plane. We have also determined for the first time a period of apsidal motion for this system, namely 185+/-16yr using all available radial velocity data sets of HD 93205 (from 1975 to 1999). Phase-locked variations of the X-ray emission of HD 93205 consisting of a rise of the observed X-ray flux near periastron passage are also discussed.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Morrell, N. I.; Facultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de La Plata, Paseo del Bosque S/N, B1900FWA La Plata, Argentina
Barbá, R. H.; Facultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de La Plata, Paseo del Bosque S/N, B1900FWA La Plata, Argentina
Niemela, V. S.; Facultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de La Plata, Paseo del Bosque S/N, B1900FWA La Plata, Argentina
Corti, M. A.; Facultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de La Plata, Paseo del Bosque S/N, B1900FWA La Plata, Argentina
Albacete Colombo, J. F.; Facultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de La Plata, Paseo del Bosque S/N, B1900FWA La Plata, Argentina
Rauw, Grégor ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Groupe d'astrophysique des hautes énergies (GAPHE) - Sciences spatiales
Corcoran, M.; Universities Space Research Association, 7501 Forbes Blvd, Ste 206, Seabrook, MD 20706, USA ; Laboratory for High Energy Astrophysics, Goddard Space Flight Center, Greenbelt, MD 20771, USA
Morel, Thierry ; Inter-University Center for Astronomy and Astrophysics (IUCAA), Post Bag 4, Ganeshkhind, Pune 411 007, India
Bertrand, J.-F.; Département de Physique, Université de Montréal, and Observatoire du Mont Mégantic, CP 6128, Succursale Centre-ville, Montréal,QC H3C 3J7, Canada
Moffat, A. F. J.; Département de Physique, Université de Montréal, and Observatoire du Mont Mégantic, CP 6128, Succursale Centre-ville, Montréal,QC H3C 3J7, Canada
St-Louis, N.; Département de Physique, Université de Montréal, and Observatoire du Mont Mégantic, CP 6128, Succursale Centre-ville, Montréal,QC H3C 3J7, Canada
Language :
English
Title :
Optical spectroscopy of X-Mega targets - II. The massive double-lined O-type binary HD 93205
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