Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...238l..81c&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 238, June 1, 1980, p. L81-L85. Research supported by the National Re
Astronomy and Astrophysics
Astrophysics
29
Carbon Stars, Emission Spectra, Line Spectra, Shock Wave Interaction, Stellar Spectra, Continuous Radiation, Cosmic Dust, Forbidden Bands, H Lines, Light (Visible Radiation), Photosphere, Stellar Atmospheres, Stellar Envelopes, Thermal Radiation
Scientific paper
Optical spectroscopic monitoring of the extreme carbon star IRC +30219 has revealed striking changes between 1977 and 1980. The stellar photosphere was barely visible in early 1979. There was an emission line spectrum consisting of H, forbidden O I, forbidden O II, forbidden N I, forbidden N II, forbidden S II, and He I. It is likely that these lines arose in a shocked region where recent stellar mass loss encountered the extensive circumstellar envelope. By late 1979, this emission-line spectrum had vanished, and the photosphere had reappeared. The weakening of the photospheric features in early 1979 was caused by increased attenuation of starlight and overlying thermal emission, both due to recently condensed hot dust grains.
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