Hot degenerates in the MCT survey. I. MCT 0130 - 1937, a new, color-selected PG 1159 object

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

DOI:https://doi.org/10.1086/168462· OSTI ID:6966455

Demers, S; Wesemael, F; Fontaine, G; Lamontagne, R; Irwin, M J ^[1]

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1. Observatorio Interamericano de Cerro Tololo, La Serena (Chile) Montreal Universite, Montreal (Canada) Cambridge Univ. (England)

In the course of a survey for high-latitude, UV excess objects in the Southern Hemisphere, a new white dwarf star belonging to the PG 1159 spectroscopic class was discovered. A variety of spectroscopic observations show this object to be similar to the prototype PG 1159 - 035 in exhibiting He II, C IV, and O VI features in its optical spectrum, as well as a rich absorption spectrum in the ultraviolet. In addition, the slope of its energy distribution appears as steep as that of PG 1159 - 035 and is consistent with the Rayleigh-Jeans tail of a very hot star. White-light, high-speed photometry reveals that this object does not exhibit periodic variations in the range 10-2000 s with semiamplitudes larger than about 0.002 mag. The importance of such objects for current models of the spectral evolution of white dwarfs is emphasized. 37 refs.

• OSTI ID: 6966455
• Journal Information: Astrophysical Journal; (USA), Journal Name: Astrophysical Journal; (USA) Vol. 351; 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
ABSORPTION SPECTRA
ATMOSPHERES
CHARGE-COUPLED DEVICES
DWARF STARS
ELEMENTS
FLUIDS
GASES
HELIUM
MATHEMATICAL MODELS
NONMETALS
RARE GASES
SEMICONDUCTOR DEVICES
SPECTRA
SPECTROPHOTOMETRY
STAR MODELS
STARS
STELLAR ATMOSPHERES
ULTRAVIOLET SPECTRA
VARIATIONS
VISIBLE SPECTRA
WHITE DWARF STARS