The unusual phenomena of X Per in the new emission phase

Details The unusual phenomena of X Per in the new emission phase The unusual phenomena of X Per in the new emission phase

Nov 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997acasn..38..434l&link_type=abstract

Acta Astronomica Sinica, vol. 38, p. 434

Astronomy and Astrophysics

Astronomy

X Ray Binaries, Infrared Photometry, Emission Spectra, H Alpha Line, Spectral Line Width, Stellar Structure, Ring Structures, Stellar Models

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 the H-alpha emission line and JHK magnitudes exceeded the values recorded before. 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 the H-alpha 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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