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Evidence of Chromospheric Activity on HR 1099

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Abstract

We present an observational evidence of the chromospheric activity on HR1099. The IUE spectra of HR 1099 were used for the ultraviolet photometry and for the intensity variation of chromospheric emission line. Ultraviolet light curves were made from the low and high dispersion IUE spectra and were compared with a optical light curve. We have analyzed the ultraviolet and optical light curves by the Wilson and Devinney computing code including dark spots. The intensity variation of Mg II emission line depends on the orbital phase. The maximum intensity of Mg II emission line occurs at the phase of light minimum where dark spot visibility is maximum due to strong chromospheric activity.

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Authors and Affiliations

  1. Dept. of Earth Sciences, Sejong University, Seoul, 143-747, Korea; E-mail

    Young Woon Kang

  2. Department of Earth Science, Chonnam National University, Kwangju, 500-757, Korea; E-mail

    Kyu Dong Oh

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  1. Young Woon Kang
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  2. Kyu Dong Oh
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Kang, Y.W., Oh, K.D. Evidence of Chromospheric Activity on HR 1099. Astrophysics and Space Science 268, 415–424 (1999). https://doi.org/10.1023/A:1002029905148

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