Coordinated optical and ultraviolet observations of IM Pegasi

Journal Article · Thu Feb 01 04:00:00 EST 1990 · Astrophysical Journal; (USA)

DOI:https://doi.org/10.1086/168428· OSTI ID:7135476

Huenemoerder, D P; Ramsey, L W; Buzasi, D L ^[1]

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1. Pennsylvania State Univ., University Park (USA)

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. 30 refs.

• OSTI ID: 7135476
• Journal Information: Astrophysical Journal; (USA), Journal Name: Astrophysical Journal; (USA) Vol. 350; ISSN ASJOA; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ATMOSPHERES
BALMER LINES
BINARY STARS
EMISSION SPECTRA
SPECTRA
SPECTROPHOTOMETRY
STARS
STELLAR ACTIVITY
STELLAR ATMOSPHERES
STELLAR CHROMOSPHERES
ULTRAVIOLET SPECTRA
VISIBLE SPECTRA