MgS grain component in circumstellar shells

Autor:	Samuel H. Moseley, J. H. Goebel
Rok vydání:	1985
Předmět:	Physics medicine.diagnostic_test Long wavelength limit chemistry.chemical_element Astronomy Astronomy and Astrophysics Oxygen Sulfur Carbon star Spectral line Photometry (optics) Interstellar medium chemistry Space and Planetary Science Spectrophotometry medicine
Zdroj:	The Astrophysical Journal. 290:L35
ISSN:	1538-4357 0004-637X
Popis:	In this letter, far-infrared spectrophotometry (30-55 microns) and photometry (53-200 microns) are presented which define, for the first time, the long wavelength limit of the previously unidentified 30 micron emission feature found in certain extreme carbon star spectra. The spectral similarities are sufficiently similar to those of solid MgS that MgS is proposed to be the band carrier. This is interpreted as the first direct evidence that chemical surface reactions occur on dust grains in circumstellar environments. The presence of MgS indicates that either the oxygen abundance is relatively low and/or the sulfur abundance is high in extreme carbon stars.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::c2186c0a4dd1ff97312a411ff5fde032 https://doi.org/10.1086/184437 Zobrazit plný text záznamu