Evidence of Chromospheric Activity on HR 1099

Authors: Kang Y.W.¹; OH K.D.²

Source: Astrophysics and Space Science, Volume 268, Number 4, 1999 , pp. 415-424(10)

Publisher: Springer

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Abstract:

We present an observational evidence of the chromospheric activity on HR 1099. 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.

Language: English

Document Type: Regular paper

Affiliations: 1: Dept. of Earth Sciences, Sejong University, Seoul, 143-747, Korea; E-mail: kangyw@sejong.ac.kr 2: Department of Earth Science, Chonnam National University, Kwangju, 500-757, Korea; E-mail: ohkd@chonnam.chonnam.ac.kr

Publication date: 1999-01-01