Pi Gruis - Molecular identifications and spectral classification

Details Pi Gruis - Molecular identifications and spectral classification Pi Gruis - Molecular identifications and spectral classification

Aug 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983ap%26ss..94..295m&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 94, no. 2, Aug. 1983, p. 295-305.

Astronomy and Astrophysics

Astrophysics

Abundance, Metallicity, Molecular Spectra, Nuclear Fusion, S Stars, Stellar Spectra, Chemical Equilibrium, Metal Oxides, Molecular Absorption, Stellar Atmospheres, Zirconium Oxides

Scientific paper

Identifications of the molecular absorption features in the visible spectrum of the S star Pi Gruis are presented. Moderate dispersion spectrum of π1 Gru covering the region 5800-7300 Å, demonstrates the presence of a multitude of molecular bands. Wavelength measures of well over 150 red-degraded band heads are listed. Nearly 80% of the observed features are identified with the ZrO, LaO, YO, and CeO molecules. Neither TiO molecular features nor any Ba compounds are detectable. As a consequence of the presence of bands due to s-process oxides and the absence of TiO bands, π1 Gru may be classified as a pure S star.

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