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NMA Imaging of Envelopes and Disks around Low Mass Protostars and T Tauri Stars

Published online by Cambridge University Press:  25 May 2016

Yoshimi Kitamura ,
Masao Saito ,
Ryohei Kawabe  and
Kazuyoshi Sunada
Yoshimi Kitamura
Affiliation:
Institute of Space and Astronautical Science, 3-1-1 Yoshinodai, Sagamihara, Kanagawa 229, Japan
Masao Saito
Affiliation:
Department of Astronomy, University of Tokyo, 2-11-16 Yayoi, Bunkyo-ku, Tokyo 113, Japan
Ryohei Kawabe
Affiliation:
Nobeyama Radio Observatory, Nobeyama, Minamimaki-mura, Minamisaku-gun, Nagano 384-13, Japan
Kazuyoshi Sunada
Affiliation:
Nobeyama Radio Observatory, Nobeyama, Minamimaki-mura, Minamisaku-gun, Nagano 384-13, Japan

Abstract

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We are intensively studying low mass star formation with the radio telescopes at Nobeyama in Japan. Using both the Nobeyama 45 m dish equipped with a 2 × 2 array receiver and the Nobeyama Millimeter Array (NMA), we can cover a very wide spatial range from overall molecular clouds down to compact protoplanetary disks. With the 45 m dish we are investigating hierarchical structures of molecular clouds including star-forming cores. With NMA we are imaging disklike structures (i.e., envelopes, accretion disks, and protoplanetary disks) around protostars and T Tauri stars. Recently, we have completed our survey for dense disklike envelopes around eleven Class 0 & I protostars by NMA. In this paper, we will present our recent results of the disklike envelopes in addition to the previous NMA results of the disks around three T Tauri stars. On the basis of the data, we will discuss the evolution of the disklike structures (dense envelopes → tenuous ones → dispersing ones → accretion disks → protoplanetary ones), and propose a new scenario for the formation of low mass stars.

Type
IV. Disks, Winds, and Magnetic Fields
Information
Symposium - International Astronomical Union , Volume 182: Herbig-Haro Flows and the Birth of Low Mass Stars , 1997 , pp. 381 - 390
Copyright
Copyright © Kluwer 1997 

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