THE ENIGMATIC STAR EZ PEGASI—A MYSTERY SOLVED?

EZ Peg, a ninth-magnitude G star that has been classified by various authors as an irregular variable, a U Gem system, and a contact binary is shown to have all the spectroscopic and photometric characteristics of an active-chromosphere RS CVn binary. We suggest that the reported "outburst"...

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Veröffentlicht in:	Publ. Astron. Soc. Pac.; (United States) 1985-01, Vol.97 (587), p.72-77
Hauptverfasser:	HOWELL, STEVE B., BOPP, BERNARD W.
Format:	Artikel
Sprache:	eng
Schlagworte:	640102 - Astrophysics & Cosmology- Stars & Quasi-Stellar, Radio & X-Ray Sources Astronomy ATMOSPHERES BINARY STARS CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS Earth, ocean, space Emission spectra Exact sciences and technology Observational astronomy Observatories Optical bursts Radial velocity Spectrograms SPECTROPHOTOMETRY STARS STELLAR ACTIVITY STELLAR ATMOSPHERES STELLAR CHROMOSPHERES Stellar classification Stellar spectra Unusual and peculiar variables Variable and peculiar stars (including novae) VARIABLE STARS
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Zusammenfassung:	EZ Peg, a ninth-magnitude G star that has been classified by various authors as an irregular variable, a U Gem system, and a contact binary is shown to have all the spectroscopic and photometric characteristics of an active-chromosphere RS CVn binary. We suggest that the reported "outburst" of 1943, when the spectrum appeared to be that of a B star, never occurred. The strong Ca II H and K reversals, viewed with low spectral resolution, caused the photospheric Ca II absorption to appear abnormally weak, mimicking a much earlier spectral type.
ISSN:	0004-6280 1538-3873
DOI:	10.1086/131499