Unidentified molecular features in the red spectrum /5800 to 7300 A/ of Pi Gruis

Details Unidentified molecular features in the red spectrum /5800 to 7300 A/ of Pi Gruis Unidentified molecular features in the red spectrum /5800 to 7300 A/ of Pi Gruis

Nov 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982ap%26ss..88..189m&link_type=abstract

Astrophysics and Space Science, vol. 88, no. 1, Nov. 1982, p. 189-196.

Astronomy and Astrophysics

Astrophysics

Molecular Spectra, S Stars, Stellar Spectra, Visible Spectrum, Chemical Composition, H Alpha Line, Metal Oxides, Neodymium Compounds, Spectral Bands

Scientific paper

The moderate dispersion (46 A/mm at H-alpha) image-tube spectrum (5800-7300 A) of the S star Pi Gru is found to exhibit several unidentified molecular features, in addition to the well known bands of the oxides of s-process elements. A list is presented of 28 measured unidentified red-degraded bands, of which six, at 5998, 6128, 6143, 6223, 6257, and 6557 A, are prominent. Of the reported 28 bands, 22 are observed for the first time. A discussion is included on the expected molecular sources of the unidentified features. The possible presence of two new molecules, PrO and NdO in Pi Gru is suggested.

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