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Aperture synthesis CS and 98 GHz continuum observations of protostellar IRAS sources in Taurus

Published online by Cambridge University Press:  03 August 2017

N. Ohashi ,
R. Kawabe ,
M. Hayashi  and
M. Ishiguro
N. Ohashi
Affiliation:
Nobeyama Radio Observatory, National Astronomical Observatory, Japan
R. Kawabe
Affiliation:
Nobeyama Radio Observatory, National Astronomical Observatory, Japan
M. Hayashi
Affiliation:
Department of Astronomy, University of Tokyo, Japan
M. Ishiguro
Affiliation:
Nobeyama Radio Observatory, National Astronomical Observatory, Japan

Abstract

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The CS (J = 2 — 1) line and 98 GHz continuum emission have been observed for 11 protostellar IRAS sources in the Taurus molecular cloud with resolutions of 2.6″−8.8″ (360 AU—1200 AU) using the Nobeyama Millimeter Array (NMA). The CS emission is detected only toward embedded sources, while the continuum emission from dust grains is detected only toward visible T Tauri stars except for one embedded source, L1551-IRS5. This suggests that the dust grains around the embedded sources do not centrally concentrate enough to be detected with our sensitivity (∼4 m Jy r.m.s), while dust grains in disks around the T Tauri stars have enough total mass to be detected with the NMA. The molecular cloud cores around the embedded sources are moderately extended and dense enough to be detected in CS, while gas disks around the T Tauri are not detected because the radius of such gas disks may be smaller than 70 (50 K/Tex) AU. These results imply that the total amount of matter within the NMA beam size must increase when the central objects evolve into T Tauri stars from embedded sources, suggesting that the compact and highly dense disks around T Tauri stars are formed by the dynamical mass accretion during the embedded protostar phase.

Type
Early Stages of Stellar Evolution
Information
Symposium - International Astronomical Union , Volume 147: Fragmentation of Molecular Clouds and Star Formation , 1991 , pp. 353 - 356
Copyright
Copyright © Kluwer 1991 

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