IUE spectrophotometry of the hot helium-rich PG1159 DO degenerates

Details IUE spectrophotometry of the hot helium-rich PG1159 DO degenerates IUE spectrophotometry of the hot helium-rich PG1159 DO degenerates

Dec 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984nascp2349..273s&link_type=abstract

In NASA. Goddard Space Flight Center Future of Ultraviolet Astronomy Based on Six Years of IUE Res. p 273-276 (SEE N85-20961 1

Astronomy and Astrophysics

Astronomy

2

Helium, Hot Stars, Stellar Spectra, Stellar Spectrophotometry, Absorption Spectra, Gravitation, Iue, Line Spectra, Planetary Nebulae, Spectral Energy Distribution, Stellar Evolution, Ultraviolet Radiation, Ultraviolet Spectrometers, Wolf-Rayet Stars

Scientific paper

The PG1159 degenerates represent the hottest spectroscopic subgroup of DO stars. Their optical spectra are characterized by broad HeII (lambda 4686) absorption and several transitions of CIV, NIII and CIII. High resolution MMT scans reveal central emission reversals. The discovery of complex, non-radial pulsations in four members of the class underscores the need for accurate temperatures, gravities and abundances for these object. Low resolution IUE spectra of four PG1159 stars, PG1151-029, PG1424+535, PG1520+525 were obtained, as well as an additional image of PG1159-035 and an optical ultraviolet spectrum of PG2131+066. IUE (SWP) spectra suggest the presence of numerous metallic absorption features of CIV (lambda 1550), NV (lambda 1240) and a few unidentified features. The metal absorption lines and HEII (lambda 1640) have equivalent widths of a few angstroms. IUE/optical energy distributions are considered. Tentative identifications of CIV absorptions and possibly, weak OVI features in optical ultraviolet reticon spectra suggest a probable link to the subluminous Wolf-Rayet OV5 I planetary nuclei. The PG1159 DO degenerates are the hottest known (Te 100,000K), high gravity (log g 7 ) objects.

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