Coordinated optical and ultraviolet observations of IM Pegasi

Details Coordinated optical and ultraviolet observations of IM Pegasi Coordinated optical and ultraviolet observations of IM Pegasi

Feb 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...350..763h&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 350, Feb. 20, 1990, p. 763-766.

Astronomy and Astrophysics

Astronomy

22

Binary Stars, Emission Spectra, K Stars, Stellar Spectrophotometry, Ultraviolet Astronomy, Chromosphere, H Lines, Iue, Light Curve, Visible Spectrum

Scientific paper

IUE spectra and optical observations of IM Peg obtained during the summers of 1985 and 1986 are analyzed. The modulations of the UV emission lines and the H-alpha, H-beta, and the CaII IR triplet (IRT) optical lines are examined. It is observed that: the UV emissin-line modulation increases as a function of height, H-alpha variability is related to stochastic events, H-beta displays excess absorption relative to a standard star, and the Ca IRT reveals a clear modulation with phase. It is noted that IM Peg corresponds to the solar paradigm used to explain RS CVn activity.

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