Multiwavelength study of the intriguing massive star CPD–592629 (Tr16-22)

COMBI, J. A; ALBACETE COLOMBO, J. F; LUQUE ESCAMILLA, P. L.; ROMERO, GUSTAVO E.; GAMEN, R.; BENAGLIA, PAULA; MARTI, J.; LOPEZ-SANTIAGO, J

BULLETIN DE LA SOCIETE ROYALE DES SCIENCES DE LIEGE

Sociedad real de las Ciencias de Liege

Lugar: Liege; Año: 2011 vol. 80 p. 644 - 647

0037-9565

We report preliminary results of a multi-wavelength (radio–optical–X-ray) study of the massive star CPD −592629 (Tr16-22) in the Carina Nebula (NGC3372). 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 Tr16-22 is a long-term massive binary system and a variable colliding wind shock scenario.