Establishing the nature of companion candidates to X-ray emitting late B-type stars

Details Establishing the nature of companion candidates to X-ray emitting late B-type stars Establishing the nature of companion candidates to X-ray emitting late B-type stars

2007-08-07

arxiv.org/abs/0708.0860v1

Astronomy and Astrophysics

Astrophysics

6 pages, 2 figures, 3 tables, accepted for publication in MNRAS

Scientific paper

10.1111/j.1365-2966.2007.12325.x

The most favored interpretation for the detection of X-ray emission from late B-type stars is that these stars have a yet undiscovered late-type companion (or an unbound nearby late-type star) that produces the X-rays. Several faint IR objects at (sub)-arcsecond separation from B-type stars have been uncovered in our earlier adaptive optics imaging observations, and some of them have been followed up with the high spatial resolution of the Chandra X-ray observatory, pinpointing the X-ray emitter. However, firm conclusions on their nature requires a search for spectroscopic signatures of youth. Here we report on our recent ISAAC observations carried out in low resolution spectroscopic mode. Equivalent widths have been used to obtain information on spectral types of the companions. All eight X-ray emitting systems with late B-type primaries studied contain dwarf like companions with spectral types later than A7. The only system in the sample where the companion turns out to be of early spectral type is not an X-ray source. These results are consistent with the assumption that the observed X-ray emission from late B-type stars is produced by an active pre-main sequence companion star.

Affiliated with

Also associated with

No associations

Rating

Establishing the nature of companion candidates to X-ray emitting late B-type stars 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 Establishing the nature of companion candidates to X-ray emitting late B-type stars, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Establishing the nature of companion candidates to X-ray emitting late B-type stars will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-169911