Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...351..271d&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 351, March 1, 1990, p. 271-276. Research supported by NSERC, Ministere de l
Astronomy and Astrophysics
Astrophysics
12
Stellar Spectrophotometry, White Dwarf Stars, Charge Coupled Devices, Helium, Power Spectra, Stellar Atmospheres, Ultraviolet Spectra, Visible Spectrum
Scientific paper
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.
Demers Serge
Fontaine Gérard
Holberg Jay Brian
Irwin Mary Jane
Kepler S. O.
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