Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...332..921n&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 332, Sept. 15, 1988, p. 921-939. Research supported by the University of Te
Astronomy and Astrophysics
Astrophysics
67
Gas Temperature, Pre-Main Sequence Stars, Stellar Luminosity, Stellar Mass Ejection, Stellar Radiation, Stellar Winds, Ionized Gases, Magnetohydrodynamic Waves, Radiation Distribution, Stellar Envelopes
Scientific paper
This paper presents the results of an extensive set of calculations of the ionization and excitation structure in winds surrounding low-luminosity, pre-main-sequence stars. In most of the cases considered, the winds turn out to be mostly neutral. The ionization is due primarily to photoionization from excited levels. Collisional ionization plays a significant role only in winds with high mass-loss rates (10 to the -6th solar mass/yr) and gas temperatures (8000 K or higher). The degree of ionization is a strong function of Tg and of the stellar radiation field. The luminosity in hydrogen lines depends to a first approximation on mass-loss rate and on the ionization of the envelope. Because the ionization depends on properties like the gas temperature and the stellar radiation field, a large range of line luminosities among objects with similar mass-loss rates is predicted.
Giovanardi Carlo
Natta Antonella
Palla Fabrizio
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