Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975phdt.........3r&link_type=abstract
Ph.D. Thesis Arizona Univ., Tucson.
Astronomy and Astrophysics
Astronomy
2
Astronomical Spectroscopy, T Tauri Stars, Angular Momentum, Photometry, Spectral Energy Distribution, Stellar Envelopes, Stellar Evolution, Stellar Models
Scientific paper
Spectroscopic and photometric (optical and infrared) observations of T Tauri stars in the Taurus and Rho Oph clouds are presented. A model is proposed in which a late-type star is surrounded by a hot (approximately 20,000 K) gaseous envelope. The envelope accounts for the emission lines, the spectral veiling, and most of the true infrared excess, while temporal changes in the strength of the envelope emission appear to be the principal source of irregular light variations. Reliable bolometric luminosities were obtained which, together with effective temperatures, indicate that they are relatively low mass stars evolving toward the main sequence along quasi-state equilibrium tracks. Masses of less than 3 solar masses and ages generally less than 1 million were inferred from a comparison with theoretical evolutionary tracks. Evidence indicates that the mass-loss rate and envelope emission strength decrease with time during the T Tauri phase. It is suggested that the T Tauri phenomenon corresponds to a phase of rapid angular momentum loss in convective protostars.
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