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The eclipses of EX Hydrae

Abstract

Two short runs of spectral data on EX Hya have been obtained. One of these provides a high time and wavelength resolution data set covering a cycle in the 67 min modulation and containing a deep eclipse. The other was acquired shortly preceding one of the relatively rare outbursts of this system. Examination of these data sets confirms features noted in other studies. In particular, a broadV/R eclipse effect' is seen in the Balmer lines, and a sharp peak in Balmer line equivalent width is detected at mid-eclipse. Also, the correlation with 67 min phase of the (O-C) residuals for optical eclipse time is examined in relation to the location of the eclipsed structure. The ‘accretion curtain’ model of Rosenet al. (1988) is discussed and shown to be qualitatively consistent with the observational data in both the optical and X-ray bands.

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Hill, K.M., Watson, R.D. The eclipses of EX Hydrae. Astrophys Space Sci 163, 59–77 (1990). https://doi.org/10.1007/BF00639978

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Keywords

  • Spectral Data
  • Observational Data
  • Sharp Peak
  • High Time
  • Resolution Data