7 papers
Photometry of Be Stars in the vicinity of COROT primary targets for asteroseismology
J. Gutierrez-Soto, J. Fabregat, J. Suso +3
We present differential photometry of Be stars close to potential COROT primary targets for asteroseismology. Several stars are found to be short period variables. We propose them…
The Be star content of young open clusters
Juan Fabregat
We present a photometric survey aimed to characterize the Be star population of young open clusters. It is found that in these clusters early-type Be stars are more frequent than i…
Evidence of H alpha periodicities in LS I+61303
R. K. Zamanov, J. Marti, J. M. Paredes +3
We present the results of analyzing H spectra of the radio emitting X-ray binary LS I+61303. For the first time, the same 26.5 d radio period is clearly detected in the H emi…
On the evolutionary status of Be stars
Juan Fabregat, J. Miguel Torrejon
We present a study of the abundance of Be stars in open clusters as a function of the cluster age, using whenever possible ages determined through Stromgren uvby photometry. For th…
Large-scale perturbations in the circumstellar envelopes of Be/X-ray binaries
I. Negueruela, P. Reig, M. J. Coe +1
We investigate the spectroscopic characteristics of the optical components of Be/X-ray binary systems, using data collected during our seven-year monitoring campaign. We find examp…
Be stars in open clusters. III. A uvby-beta calibration for the astrophysical parameters of Be stars
Juan Fabregat, Jose M. Torrejon
We present an empirical calibration of the uvby-beta photometric system to determine the intrinsic colours and indices and the astrophysical parameters of the underlying star, vali…