The nature of the dust around R Coronae Borealis stars - Isolated amorphous carbon or graphite fractals?
1991; IOP Publishing; Volume: 367; Linguagem: Inglês
10.1086/169658
ISSN1538-4357
Autores Tópico(s)Astrophysics and Star Formation Studies
Resumoview Abstract Citations (24) References (25) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Nature of the Dust around R Coronae Borealis Stars: Isolated Amorphous Carbon or Graphite Fractals? Hecht, J. H. Abstract Wright (1989) has proposed that the R CrB phenomenon is caused by the occurrence of graphite fractal grains, each composed of numerous, less than 15-nm-radius graphite spheres. It is shown that both the observational data and models of dust formation are more in accord with an earlier model by Hecht et al. (1984): that the R CrB type dust is composed of isolated small (less than 100-nm-radius) glassy or amorphous carbon grains. It cannot be ruled out that a significant number of fractal grains exist, provided that they have dielectric properties different from bulk graphite and closer to amorphous carbon, and that the individual grains in the fractals are below 1 nm in size. However, the existence of such fractal grains around R CrB stars might be ruled out by the lack of a 2400-A feature in the interstellar extinction curve. Publication: The Astrophysical Journal Pub Date: February 1991 DOI: 10.1086/169658 Bibcode: 1991ApJ...367..635H Keywords: Carbon; Cosmic Dust; Fractals; Graphite; R Coronae Borealis Stars; Stellar Envelopes; Crystal Growth; Grain Size; Interstellar Extinction; Interstellar Matter; Iue; Stellar Models; Astrophysics; STARS: R CORONAE BOREALIS; STARS: CIRCUMSTELLAR SHELLS; INTERSTELLAR: GRAINS full text sources ADS | data products SIMBAD (3) MAST (1)
Referência(s)