Ionization structure and emission of winds from low-luminosity pre-main-sequence stars

Abstract

view Abstract Citations (69) References (46) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Ionization Structure and Emission of Winds from Low-Luminosity Pre--Main-Sequence Stars Natta, A. ; Giovanardi, C. ; Palla, F. Abstract 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. Publication: The Astrophysical Journal Pub Date: September 1988 DOI: 10.1086/166702 Bibcode: 1988ApJ...332..921N Keywords: Gas Temperature; Pre-Main Sequence Stars; Stellar Luminosity; Stellar Mass Ejection; Stellar Radiation; Stellar Winds; Ionized Gases; Magnetohydrodynamic Waves; Radiation Distribution; Stellar Envelopes; Astrophysics; STARS: MASS LOSS; STARS: PRE--MAIN-SEQUENCE; STARS: WINDS full text sources ADS | data products SIMBAD (5)