HD 52961 - an extremely metal-deficient, CNO- and S-rich, pulsating star embedded in a dust cloud

Details HD 52961 - an extremely metal-deficient, CNO- and S-rich, pulsating star embedded in a dust cloud HD 52961 - an extremely metal-deficient, CNO- and S-rich, pulsating star embedded in a dust cloud

Nov 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...251..495w&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 251, no. 2, Nov. 1991, p. 495-504. Research supported by FRFC.

Astronomy and Astrophysics

Astrophysics

75

Abundance, Cosmic Dust, Stellar Envelopes, Stellar Evolution, Stellar Oscillations, Absorption Spectra, Astronomical Photometry, Astronomical Spectroscopy, Line Spectra, Metallicity, Photosphere

Scientific paper

Results of an LTE atmosphere analysis of the seventh-magnitude star HD 52961 are presented. The iron abundance of HD 52961 is found to be as low as -4.8; the abundances of carbon, nitrogen, oxygen, and also sulphur are enhanced with respect to iron by several orders of magnitude. HD 52961 displays an infrared excess which is due to circumstellar dust; the dust shell does not cause significant circumstellar absorption. It is suggested that HD 52961 is a slightly cooler analog of the peculiar supergiant HR 4049. The first detection of a metal line in the optical spectrum of the latter star is reported; the iron abundance derived from it is also -4.8. One possible explanation of the IR excess and the abundances in these stars is that they are presently evolving away from the AGB. This possibility is discussed considering the short timescale of this phase and the lack of observed progenitors with such extreme metallicities. It is suggested that the sulphur anomaly may have its origin in the violent core flashes that very-low-metallicity stars possibly undergo.

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