Open AccessOptical spectroscopy of X‐Mega targets – IV. CPD – 59°2636: a new O‐type multiple system in the Carina Nebula
Author(s) -
Albacete Colombo J. F.,
Morrell N. I.,
Rauw G.,
Corcoran M. F.,
Niemela V. S.,
Sana H.
Publication year - 2002
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1046/j.1365-8711.2002.05755.x
Subject(s) - physics , astrophysics , nebula , radial velocity , orion nebula , spectroscopy , amplitude , binary number , orbit (dynamics) , stars , astronomy , optics , arithmetic , mathematics , engineering , aerospace engineering
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 M ⊙ . 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.