Winds from T Tauri stars. I. Spherically symmetric models

Journal Article · Mon Jan 01 04:00:00 EST 1990 · Astrophysical Journal; (USA)

DOI:https://doi.org/10.1086/168304· OSTI ID:6956247

Hartmann, L; Avrett, E H; Loeser, R; Calvet, N ^[1]

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1. Harvard-Smithsonian Center for Astrophysics, Cambridge, MA (USA) Centro de Investigaciones de Astronomia, Merida (Venezuela) Institut d'Estudis Catalans, Barcelona (Spain)

Line fluxes and profiles are computed for a sequence of spherically symmetric T Tauri wind models. The calculations indicate that the H-alpha emission of T Tauri stars arises in an extended and probably turbulent circumstellar envelope at temperatures above about 8000 K. The models predict that Mg II resonance line emission should be strongly correlated with H-alpha fluxes; observed Mg II/H-alpha ratios are inconsistent with the models unless extinction corrections have been underestimated. The models predict that most of the Ca II resonance line and IR triplet emission arises in dense layers close to the star rather than in the wind. H-alpha emission levels suggest mass loss rates of about 10 to the -8th solar mass/yr for most T Tauri stars, in reasonable agreement with independent analysis of forbidden emission lines. These results should be useful for interpreting observed line profiles in terms of wind densities, temperatures, and velocity fields. 67 refs.

• OSTI ID: 6956247
• Journal Information: Astrophysical Journal; (USA), Journal Name: Astrophysical Journal; (USA) Vol. 349; ISSN ASJOA; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ATMOSPHERES
BALMER LINES
DENSITY
EMISSION SPECTRA
ERUPTIVE VARIABLE STARS
MATHEMATICAL MODELS
PHYSICAL PROPERTIES
RADIATION TRANSPORT
SPECTRA
SPECTROPHOTOMETRY
STAR EVOLUTION
STAR MODELS
STARS
STELLAR ACTIVITY
STELLAR ATMOSPHERES
STELLAR CHROMOSPHERES
STELLAR WINDS
T TAURI STARS
VARIABLE STARS
VELOCITY