Identification of XX Ceti and US 3215 as Extragalactic Objects

Identification of XX Ceti and US 3215 as Extragalactic Objects

XX Ceti and US 3215 were selected on the basis of their blue and ultraviolet color excess, and have been identified as optical variables. They were previously thought to be cataclysmic variable stars, but recently acquired spectra show that they are extragalactic. XX Cet is a quasar with a redshift...

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Veröffentlicht in:Publications of the Astronomical Society of the Pacific 1993-04, Vol.105 (686), p.383-386
Hauptverfasser: Howell, Steve B., Usher, Peter D.
Format: Artikel
Sprache:eng
Schlagworte:
Astronomical objects
Astronomy
Colors
Earth, ocean, space
Exact sciences and technology
Galaxies
Integration tables
Interstellar medium (ism) and nebulae in external galaxies
Light curves
Line spectra
Optical filters
Quasars
Red shift
Spectral index
Stellar systems. Galactic and extragalactic objects and systems. The universe
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Beschreibung
Zusammenfassung:XX Ceti and US 3215 were selected on the basis of their blue and ultraviolet color excess, and have been identified as optical variables. They were previously thought to be cataclysmic variable stars, but recently acquired spectra show that they are extragalactic. XX Cet is a quasar with a redshift of 0.736, and US 3215 is a Seyfert 1 galaxy with a redshift of 0.193. Photometric data indicating the presence of microvariability are presented and the nature of these two objects is discussed.
ISSN:0004-6280
1538-3873
DOI:10.1086/133166