Submillimeter measurements of T Tauri and FU Orionis stars

Abstract

view Abstract Citations (192) References (16) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Submillimeter Measurements of T Tauri and FU Orionis Stars Weintraub, David A. ; Sandell, G. ; Duncan, W. D. Abstract 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. Publication: The Astrophysical Journal Pub Date: May 1989 DOI: 10.1086/185441 Bibcode: 1989ApJ...340L..69W Keywords: Radio Emission; Stellar Envelopes; Stellar Spectra; T Tauri Stars; Cosmic Dust; Optical Thickness; Radiant Flux Density; Submillimeter Waves; Astrophysics; STARS: CIRCUMSTELLAR SHELLS; STARS: PRE--MAIN-SEQUENCE; STARS: RADIO RADIATION full text sources ADS | data products SIMBAD (16)