Unusual phenomena in the new emission phase of X Persei

Details Unusual phenomena in the new emission phase of X Persei Unusual phenomena in the new emission phase of X Persei

Feb 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998cha%26a..22..192l&link_type=abstract

Chinese Astronomy and Astrophysics, Volume 22, Issue 2, p. 192-197.

Astronomy and Astrophysics

Astrophysics

Scientific paper

We present a series of optical spectroscopic and infrared photometric observations of the Be/X-ray system X Per in 1992-95. Some phenomena in this new emission phase turn out to be unique in comparison with former observations. First, although the V magnitude only recovered its original maximum brightness from 1974 to 1991, the equivalent width (EW) of Hα emission line and JHK magnitudes exceeded the values recorded before, and this means that the circumstellar envelope of X Per in the new emission phase is more extensive and denser. Second, we have for the first time observed in X Per that the EW of Hα line increased rapidly while the JHK magnitudes declined considerably. Our optical spectroscopic data support the rotating ring model of the envelope and confirm the existence of the double-ring structure, with which the observed unusual phenomena may be fairly well interpreted.

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