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Astron. Astrophys. 322, 193-196 (1997)

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A new correlation for Be/X-ray binaries: the orbital period-H [FORMULA] equivalent width diagram

P. Reig 1, J. Fabregat 2 and M.J. Coe 1

1 Department of Physics and Astronomy, University of Southampton, SO17 1BJ, Hampshire, UK
2 Departament d'Astronomia i Astrofísica, Universitat de Valéncia, E-46100 Burjassot-Valencia, Spain

Received 17 June 1996 / Accepted 3 December 1996


A correlation between the orbital period and the strength of the H [FORMULA] line in Be/X-ray binaries has been found. Those systems with shorter orbital periods show less emission in H [FORMULA] than those with longer orbital periods. The neutron star appears to act as a barrier which prevents the formation of a extended disk in systems with short orbital period.

Key words: stars: Be – stars: neutron – X-rays: stars – binaries: close

Send offprint requests to: P. Reig (pablo@astro.soton.ac.uk)

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© European Southern Observatory (ESO) 1997

Online publication: June 30, 1998