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New Emission Phase of the Be/X-Ray Binary X Persei/4U0352+30: Nearly Simultaneous Spectroscopic and Near-Infrared Observations

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Abstract

We present a series of optical spectroscopic andnear-infrared photometric observations of the Be star X Persei, from thebeginning of the recent emission phase. Our data show that after the latestextended low state (ELS), both the equivalent width (EW) of theHα emission line and the JHK luminosities gradually increased. Therecent maximum Hα EW and JHK magnitudes are more than butcomparable to the 1986–1989 maxima, which reflects a more extensiveand denser envelope in the new emission phase.The IR photometry and the Hα EW increase coincidently in theearly stage of the new emission phase. However, the variations in thefollowing years, especially in 1994 and 1995, are much different from theearly trend. An unusual variation that while the Hα EW in X Perincreases considerably, the JHK magnitudes decline rapidly is seen in ournearly simultaneous spectroscopic and near-infrared observations.An expanding ring model is put forward to interpret the observedunusual variation between the Hα EW and near-IR luminosity duringthe recent emission phase of X Persei. Our results indicate that althoughboth infrared excess and Hα emission line arise from the envelope,their main contributors, in some cases, are likely to originate in thedifferent part of the envelope.

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Authors and Affiliations

  1. Purple Mountain Observatory, Nanjing, 210008, China

    Q.-Z. Liu

  2. National Astronomical Observatories, Chinese Academy of Sciences, China

    Q.-Z. Liu

  3. Astronomical Institute `Anton Pannekoek', University of Amsterdam, Kruislaan 403, 1098 SJ, Amsterdam, The Netherlands

    Q.-Z. Liu

Authors
  1. Q.-Z. Liu
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  2. H.-R. Hang
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Liu, QZ., Hang, HR. New Emission Phase of the Be/X-Ray Binary X Persei/4U0352+30: Nearly Simultaneous Spectroscopic and Near-Infrared Observations. Astrophysics and Space Science 275, 401–414 (2001). https://doi.org/10.1023/A:1002768714475

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