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

Astronomy and Astrophysics – Astrophysics

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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.

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