Submillimeter measurements of T Tauri and FU Orionis stars
- California Univ., Los Angeles (USA)
Millimeter and submillimeter detections of 12 low-mass, premain-sequence stars are reported: nine T Tauri stars, one SU Aurigae star, and two FU Orionis stars. The submm spectra of T Tauri stars are found to be less steep than that expected from optically thin thermal dust emission. The dust emissivity index, beta, is found to range between 0 and 1.5 for the T Tauri stars. For the two FU Ori stars in our sample, beta is greater than 1 which is more similar to the beta index range 1-2 found for dust associated with molecular clouds and compact H II regions. The low values for beta indicate that column density and temperature gradients cannot be neglected for the dusty T Tauri environments and/or that the grains are large in the accretion disks surrounding T Tauri stars. Although most of the stars in the sample appear unresolved, the stars T Tau, DG Tau, and possibly HL Tau appear to have structure on 1000-2000 AU scales at 800 microns. Total circumstellar masses of a few times 0.01 solar masses for the T Tauri stars and greater than 0.1 solar masses for the FU Ori stars are estimated. 24 refs.
- OSTI ID:
- 5509463
- Journal Information:
- Astrophysical Journal; (USA), Vol. 340; ISSN 0004-637X
- Country of Publication:
- United States
- Language:
- English
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GENERAL PHYSICS
SUPERGIANT STARS
INFRARED RADIATION
MICROWAVE RADIATION
T TAURI STARS
ACCRETION DISKS
COSMIC DUST
DENSITY
H2 REGIONS
INFRARED SPECTRA
MASS
RADIANT FLUX DENSITY
TEMPERATURE GRADIENTS
COSMIC RADIO SOURCES
DUSTS
ELECTROMAGNETIC RADIATION
ERUPTIVE VARIABLE STARS
FLUX DENSITY
GIANT STARS
PHYSICAL PROPERTIES
RADIATIONS
SPECTRA
STARS
VARIABLE STARS
640102* - Astrophysics & Cosmology- Stars & Quasi-Stellar
Radio & X-Ray Sources