INVESTIGADORES
ALBACETE COLOMBO Juan Facundo
artículos
Título:
Optical spectroscopy of XMEGA targets in the Carina Nebula - III. The multiple system Tr 16-104 (≡CPD -59° 2603)
Autor/es:
RAUW, G.; SANA, H.; ANTOKHIN, I. I.; MORRELL, N. I.; NIEMELA, V. S.; ALBACETE-COLOMBO, J. F.; GOSSET, E.; VREUX, J.-M.
Revista:
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Editorial:
Blackwell publishing
Referencias:
Lugar: London - UK; Año: 2001 vol. 326 p. 1149 - 1160
ISSN:
0035-8711
Resumen:
We discuss the orbital elements of the multiple system Tr 16-104 which
is usually believed to be a member of the open cluster Trumpler 16 in
the Carina complex. We show that Tr 16-104 could be a hierarchical
triple system consisting of a short-period (2.15d) eclipsing O7V+O9.5V
binary bound to a B0.2 IV star. Our preliminary orbital solution of the
third body indicates that the B star most probably describes an
eccentric orbit with a period of ~285 or ~1341d around the close binary.
Folding photometric data from the literature with our new ephemerides,
we find that the light curve of the close binary exhibits rather narrow
eclipses indicating that the two O stars must be well inside their Roche
lobes. Our analysis of the photometric data yields a lower limit on the
inclination of the orbit of the close binary of i>=77°. The
stellar radii and luminosities of the O7 V and O9.5 V stars are
significantly smaller than expected for stars of this spectral type. Our
results suggest that Tr 16-104 lies at a distance of the order of 2.5kpc
and support a fainter absolute magnitude for zero-age main-sequence O
stars than usually adopted. We find that the dynamical configuration of
Tr 16-104 corresponds to a hierarchical system that should remain stable
provided that it suffers no strong perturbation. Finally, we also report
long-term temporal variations of high-velocity interstellar Caii
absorptions in the line of sight towards Tr 16-104.