Submillimeter measurements of T Tauri and FU Orionis stars

Journal Article · Mon May 01 04:00:00 EDT 1989 · Astrophysical Journal; (USA)

DOI:https://doi.org/10.1086/185441· OSTI ID:5509463

Weintraub, D A; Sandell, G; Duncan, W D ^[1]

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1. 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), Journal Name: Astrophysical Journal; (USA) Vol. 340; 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
ACCRETION DISKS
COSMIC DUST
COSMIC RADIO SOURCES
DENSITY
DUSTS
ELECTROMAGNETIC RADIATION
ERUPTIVE VARIABLE STARS
FLUX DENSITY
GIANT STARS
H2 REGIONS
INFRARED RADIATION
INFRARED SPECTRA
MASS
MICROWAVE RADIATION
PHYSICAL PROPERTIES
RADIANT FLUX DENSITY
RADIATIONS
SPECTRA
STARS
SUPERGIANT STARS
T TAURI STARS
TEMPERATURE GRADIENTS
VARIABLE STARS