Multiwavelength study of the intriguing massive star CPD−59 2629 (Tr 16-22)
Instituto Argentino de Radioastronomía, Buenos Aires, Argentina, and Centro Universitario Regional Zona Atlántica (CURZA), Viedma, Argentina, et
Departamento de Física, Universidad de Jaén, Jaén, Spain
Centro Universitario Regional Zona Atlántica (CURZA), Viedma, Argentina
Departamento de Física, Universidad de Jaén, Jaén, Spain
Instituto Argentino de Radioastronomía, Buenos Aires, Argentina
Instituto de Astrofísica de La Plata, CONICET, UNLP, Argentina
Instituto Argentino de Radioastronomía, Buenos Aires, Argentina
Departamento de Física, Universidad de Jaén, Jaén, Spain
Departamento de Astrofísica y CC. de la Atmósfera, UCM, Madrid, Spain
Departamento de Física, Universidad de Jaén, Jaén, Spain
Departamento de Física, Universidad de Jaén, Jaén, Spain
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.