INVESTIGADORES
ALBACETE COLOMBO Juan Facundo
artículos
Título:
Optical spectroscopy of X-Mega targets - I. CPD -59° 2635: a new double-lined O-type binary in the Carina Nebula
Autor/es:
ALBACETE COLOMBO, J. F.; MORRELL, N. I.; NIEMELA, V. S.; CORCORAN, M. F.
Revista:
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Editorial:
Blackwell publishing
Referencias:
Lugar: London - UK; Año: 2001 vol. 326 p. 78 - 84
ISSN:
0035-8711
Resumen:
Optical spectroscopy of CPD -59° 2635, one of the O-type stars in
the open cluster Trumpler 16 in the Carina Nebula, reveals this star to
be a double-lined binary system. We have obtained the first radial
velocity orbit for this system, consisting of a circular solution with a
period of 2.2999d and semi-amplitudes of 208 and 273kms-1.
This results in minimum masses of 15 and 11Msolar for the
binary components of CPD -59° 2635, which we classified as O8V and
O9.5V, although spectral type variations of the order of 1 subclass,
which we identify as the Struve-Sahade effect, seem to be present in
both components. From ROSAT HRI observations of CPD -59° 2635 we
determine a luminosity ratio log(Lx/Lbol)~-7,
which is similar to that observed for other O-type stars in the Carina
Nebula region. No evidence of light variations is present in the
available optical or X-ray data sets.