The unique cometary nebula Parsamian 13

Details The unique cometary nebula Parsamian 13 The unique cometary nebula Parsamian 13

Oct 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...273..624c&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 273, Oct. 15, 1983, p. 624-632.

Astronomy and Astrophysics

Astronomy

12

Abundance, Cosmic Dust, Interstellar Matter, Nebulae, Stellar Mass Ejection, Astronomical Spectroscopy, Infrared Astronomy, Main Sequence Stars, Stellar Evolution, Stellar Luminosity, T Tauri Stars, Visible Spectrum

Scientific paper

Parsamian 13 is found to be a cometary nebula, with a deeply embedded star suffering strong absorption by silicate grains. A feature near 2.7 microns, attributed to absorption by terminal OH groups, may represent the first detection in an astrophysical environment of water ice grains diluted by another molecule, for example by CO. The bolometric luminosity suggests that this star is either an extremely young T Tauri star or an evolved low-mass star, now a red giant, high on its convective track. Most unusual is the presence of cold (50 K) TiO gas in sufficient abundance to show in absorption in the optical and very near-infrared regions; this material probably represents very recently expelled photospheric layers.

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