Optical spectroscopy of X-Mega targets - IV. CPD - 59°2636: a new O-type multiple system in the Carina Nebula

Details Optical spectroscopy of X-Mega targets - IV. CPD - 59°2636: a new O-type multiple system in the Carina Nebula Optical spectroscopy of X-Mega targets - IV. CPD - 59°2636: a new O-type multiple system in the Carina Nebula

Nov 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002mnras.336.1099a&link_type=abstract

Monthly Notice of the Royal Astronomical Society, Volume 336, Issue 4, pp. 1099-1108.

Astronomy and Astrophysics

Astronomy

10

Binaries: General, Stars: Early-Type, Stars: Fundamental Parameters, Stars: Individual: Cpd: 59°2636, Open Clusters And Associations: Individual: Trumpler 16, X-Rays: Stars

Scientific paper

High-resolution optical spectroscopy of CPD - 59°2636, one of the O-type stars in the open cluster Trumpler 16 in the Carina Nebula, reveals this object to be a multiple system displaying triple lines which we label as components A, B and C of spectral types O7 V, O8 V and O9 V, respectively. From our radial velocity measurements we find that the components A and B form a close binary with a period of 3.6284 d, and we obtain the first circular radial velocity orbit for this system with semi-amplitudes of 184 and 192 km s-1, leading to minimum masses of 10.1 and 9.7 Msolar. We find that the component C is a single lined binary with a period of 5.034 d and semi-amplitude of 48 km s-1. We also analyse the X-ray radiation from CPD - 59°2636, finding neither appreciable overluminosity nor phase-related X-ray flux variations.

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