Statistics – Computation
Scientific paper
Sep 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995phdt.........4k&link_type=abstract
PhD Dissertation, California Inst. of Tech. Pasadena, CA United States
Statistics
Computation
1
T Tauri Stars, Molecular Gases, Rotating Disks, Stellar Envelopes, Emission Spectra, Line Spectra, Velocity Distribution, Accretion Disks, Stellar Mass, Star Formation, Stellar Models, Kinematics, Computational Astrophysics, Stellar Evolution
Scientific paper
Aperture synthesis images of molecular gas around the T Tauri stars, GM Aurigae, RY Tauri, DL Tauri, DO Tauri, and AS 209 are interpreted with the aid of a kinematic model of a circumstellar disk. Maps of the relatively old T Tauri star, GM Aur, in the CO-13(2 yields 1) line at 4 sec resolution reveal compact gas associated with the stellar position and at the core of a larger rotating gaseous disk, 950 x 530 AU in extent. The mean velocity gradient across the disk, which is oriented along PA approx. 50 deg, is consistent with rotation about an axis at PA = 140 deg. The structure observed in CO-13 aperture synthesis maps agrees well with synthetic maps of the gas emission generated from a model. For a disk that is inclined 30 deg from face on, in Keplerian rotation, a 0.80 solar mass central mass (star + disk), a systemic velocity, V(HEL), of 15.38 km s-l, and a mass, 0.1 solar mass is derived. Aperture synthesis images of CO(2 yields 1) emission at approx. 2-3 sec resolution from RY Tau, DL Tau, DO Tau, and AS 209 also show resolved and elongated gaseous emission. For RY Tau, the deconvolved, half-maximum radius along the direction of elongation, PA approx 48 deg, is 110 AU. Corresponding radii and orientations for the other sources are: DL Tau -250 AU at PA approx 84 deg, DO Tau -350 AU at PA approx 160 deg, and AS 209-290 AU at PA approx 138 deg. RY Tau, DL Tau, and AS 209 show velocity gradients parallel to the elongation, suggesting that the circumstellar material is rotating. RY Tau and AS 209 also exhibit double-peaked spectra characteristic of a rotating disk. Line emission from DO Tau is dominated by high-velocity blue-shifted gas which complicates the interpretation. Nevertheless, there is in each case sufficient evidence to speculate that the circumstellar emission may arise from a protoplanetary disk similar to that from which our solar system formed.
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