CASPEC observations of sdO stars - Are some sdOs lazy remnants from the AGB?

Details CASPEC observations of sdO stars - Are some sdOs lazy remnants from the AGB? CASPEC observations of sdO stars - Are some sdOs lazy remnants from the AGB?

Mar 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987msngr..47...36h&link_type=abstract

ESO Messenger (ISSN 0722-6691), March 1987, v. 47, p. 36-38.

Physics

Optics

3

Asymptotic Giant Branch Stars, B Stars, Hot Stars, O Stars, Stellar Evolution, Stellar Spectrophotometry, Subdwarf Stars, Cassegrain Optics, Horizontal Branch Stars, Line Spectra, Spectrum Analysis, Stellar Luminosity, Thermodynamic Equilibrium

Scientific paper

Eight newly discovered subdwarf O stars which were observed in the blue spectral range (3900-4800 A) are analyzed. Strong lines of ionized helium are present in all eight stars whereas He I is very weak or even absent. This indicates very high effective temperatures (greater than 55,000 K). The NLTE analyses revealed the existence of a new group of sdO stars that were once CSPNs but were born again just before they reached the hot end of the cooling sequence of white stars; a last thermal pulse brought them back to life as a post-AGB star.

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