The evolutionary status of the peculiar variable star V348 Sagittarii

Details The evolutionary status of the peculiar variable star V348 Sagittarii The evolutionary status of the peculiar variable star V348 Sagittarii

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.245..204p&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 245, July 15, 1990, p. 204-216.

Astronomy and Astrophysics

Astronomy

26

Peculiar Stars, Planetary Nebulae, Sagittarius Constellation, Stellar Evolution, Variable Stars, Hot Stars, Light Curve, Stellar Luminosity, Stellar Temperature

Scientific paper

New long-slit and narrow-band imaging observations of the nebula surrounding the peculiar variable star V348 Sgr are presented. These show that the overall ionization state of the nebula is low, but the extent, structure, and physical conditions are all typical of old planetary nebulae. An analysis of the abundances shows a pronounced helium enrichment, indicating that the system is highly evolved. Further clues to the past evolution of the system are provided by models which demonstrate that the ionization structure of the nebula is incompatible with ionization by a central star of temperature 20,000 K and luminosity 3500 solar luminosities as suspected for V348 Sgr. As there are no indications of a hotter star in the system, it is accepted that the star must have been hotter in the very recent past. Given all the observational facts, the evolutionary status of V348 Sgr is interpreted as a white dwarf that has suffered a last thermal pulse, reigniting a helium-burning shell.

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