CPD-41deg7742: an unusual wind interaction

Details CPD-41deg7742: an unusual wind interaction CPD-41deg7742: an unusual wind interaction

2005-10-29

arxiv.org/abs/astro-ph/0510822v1

Astronomy and Astrophysics

Astrophysics

4pages, 5 figures, to appear in "Distant Worlds", proceedings of the JENAM2005

Scientific paper

We summarize the results of a multiwavelength observing campaign on the massive eclipsing binary CPD-41deg7742, another remarkable object in the young open cluster NGC 6231. Our campaign relies on high resolution echelle spectroscopy, narrow-band optical photometry, and XMM-Newton X-ray observations. Combined with the spectroscopic analysis, the light curve analysis provides a direct measurement of the masses and sizes of the system components. However, the most outstanding results come from the XMM-Newton observations. Our 180 ks campaign towards NGC 6231, and CPD-41deg7742, provides an unprecedented phase coverage of such a close early-type binary. The EPIC-MOS light curves almost fully cover the 2.4 day period of the system and the brightness of the object is sufficient to yield a time resolution as tight as 1 ks. The X-ray flux presents clear variations along the orbit, that we interpret as the signature of an unusual wind interaction. We indeed expect that, in this O+B system, the dominant primary wind crashes into the secondary surface, leading to a wind-photosphere interaction. As a strong support to our interpretation, we provide a geometrical model that associates an extra X-ray emission to the secondary inner surface. Though quite simple, the present model matches the main features of the X-ray light curve.

Affiliated with

Also associated with

No associations

Rating

CPD-41deg7742: an unusual wind interaction does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with CPD-41deg7742: an unusual wind interaction, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and CPD-41deg7742: an unusual wind interaction will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-545610