The Chandra survey of Carina OB stars

• Published in: Proceedings of the International Astronomical Union Vol. 6; no. S272; pp. 608 - 609
• Main Authors: Gagné, Marc, Fehon, Garrett, Savoy, Michael R., Cohen, David H., Townsley, Leisa K., Broos, Patrick S., Povich, Matthew S., Corcoran, Michael F., Walborn, Nolan R., Moffat, Anthony F.J., Nazé, Yael, Oskinova, Lidia M.
• Format: Journal Article
• Language: English
• Published: Cambridge, UK Cambridge University Press 01.07.2010
• Subjects: Astronomy; Astrophysics; Contributed Papers; Double stars; Star & galaxy formation; X-ray astronomy; stars: early-type; X-rays: stars; stars: pre–main-sequence; X-rays: binaries
• ISSN: 1743-9213; 1743-9221
• DOI: 10.1017/S1743921311011537

We have combined 22 deep Chandra ACIS-I pointings to map over one square degree of the Carina complex. Our x-ray survey detects 69 of 70 known O-type stars and 61 of 130 known early B stars. The majority of single O stars display soft X-ray spectra and have a mean log LX/Lbol ≈ −7.5 suggesting shocks embedded in the O-star winds. Over OB stars show unusually high X-ray luminosities, high shock temperatures or time variability, not predicted for embedded wind shocks.