Multiwavelength study of the intriguing massive star CPD−59 2629 (Tr 16-22)

J. A. Combi; J. F. Albacete-Colombo; P. L. Luque Escamilla; G. E. Romero; R. Gamen; P. Benaglia; J. Martí; J. López-Santiago; E. Sánchez-Ayaso; A. J. Muñoz-Arjonilla; J. R. Sánchez-Sutil

Bulletin de la Société Royale des Sciences de Liège

0037-9565 1783-5720

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J. A. Combi, J. F. Albacete-Colombo, P. L. Luque Escamilla, G. E. Romero, R. Gamen, P. Benaglia, J. Martí, J. López-Santiago, E. Sánchez-Ayaso, A. J. Muñoz-Arjonilla & J. R. Sánchez-Sutil

Multiwavelength study of the intriguing massive star CPD−59 2629 (Tr 16-22)

(Volume 80 - Année 2011)

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Abstract

We report preliminary results of a multi-wavelength (radio–optical–X-ray) study of the massive star CPD −59 2629 (Tr 16-22) in the Carina Nebula (NGC 3372). This star has historically shown a large X-ray excess (log LX/Lbol < −6 or even larger), which is one order of magnitude larger than expected from single massive O-type stars. A colliding wind scenario is a plausible explanation. On this subject, we searched for non-thermal radio emission and used high-resolution optical spectroscopy to check for multiplicity and investigate the nature of the stars as well as the origin and excess of the X-ray emission. We detected long-term radial-velocity and X-ray variability. Both results suggest that Tr 16-22 is a long-term massive binary system and a variable colliding wind shock scenario.

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J. A. Combi, J. F. Albacete-Colombo, P. L. Luque Escamilla, G. E. Romero, R. Gamen, P. Benaglia, J. Martí, J. López-Santiago, E. Sánchez-Ayaso, A. J. Muñoz-Arjonilla & J. R. Sánchez-Sutil, «Multiwavelength study of the intriguing massive star CPD−59 2629 (Tr 16-22)», Bulletin de la Société Royale des Sciences de Liège [En ligne], Volume 80 - Année 2011, 644 - 647 URL : http://popups.ulg.be/0037-9565/index.php?id=3103.