X-ray and Optical Properties of New gcas-Like Objects Discovered in X-ray Surveys

Details X-ray and Optical Properties of New gcas-Like Objects Discovered in X-ray Surveys X-ray and Optical Properties of New gcas-Like Objects Discovered in X-ray Surveys

Mar 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aspc..361..117m&link_type=abstract

Active OB-Stars: Laboratories for Stellar and Circumstellar Physics, ASP Conference Series, Vol. 361, Proceedings of the confere

Physics

7

Scientific paper

A growing number of early Be stars discovered in X-ray surveys exhibit X-ray luminosities intermediate between those of normal stars and those of most Be/X-ray binaries in quiescence. Their X-ray spectra are also much harder than those of shocked wind OB stars and can be best fitted by a thin thermal plasma with T ˜ 10^{8} K, added to a cooler and much fainter thermal component. An iron line complex including a fluorescence component is detected in many cases. There is no evidence for coherent pulsations in any of these systems but strong variability on time scales as short as 100 s is usually observed. Large oscillations with quasi-periods of the order of one hour or more are detected in the X-ray light curves of several sources, but have so far failed to prove to be strictly periodic. The optical and X-ray properties of these new objects strikingly resemble those of the so far unique and enigmatic Be star gcas\ and define a new class of X-ray emitters. We discuss the possible origin of the X-ray emission in the light of the models proposed for gcas, magnetic disc-star interaction or accretion onto a compact companion object - neutron star or white dwarf.

Affiliated with

Also associated with

No associations

Rating

X-ray and Optical Properties of New gcas-Like Objects Discovered in X-ray Surveys 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 X-ray and Optical Properties of New gcas-Like Objects Discovered in X-ray Surveys, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and X-ray and Optical Properties of New gcas-Like Objects Discovered in X-ray Surveys will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-857879