منابع مشابه
Twisted magnetic field lines around protostars
Polarized dust emission from six star-forming cloud cores has been detected, at wavelengths of 450 to 1100 µm. The data are used to measure net magnetic field directions as a function of beam size, and in two sources the field is found to twist through very large angles (60–70 •). For the low-mass protobinary IRAS16293-2422, one field direction is along the circumbinary disk, while another is a...
متن کاملH 2 CO and CH 3 OH abundances in the envelopes around low - mass protostars
This paper presents the third in a series of single-dish studies of molecular abundances in the envelopes around a large sample of 18 low-mass pre-and protostellar objects. It focuses on typical grain mantle products and organic molecules, including H 2 CO, CH 3 OH and CH 3 CN. With a few exceptions, all H 2 CO lines can be fit by constant abundances of 7×10 −11 – 8×10 −9 throughout the envelop...
متن کاملCircumstellar Environments around the Youngest Protostars: Interferometric Observations and Modeling by Hsin-fang Chiang Dissertation
This thesis presents observations and modeling of nearby embedded sources in the earliest stage of protostellar evolution, i.e., Class 0 young stellar objects, using interferometric data of the Berkeley-Illinois-Maryland Association array and the Combined Array for Research in Millimeter-wave Astronomy. Protostars form through gravitational collapse inside their natal envelopes, and these circu...
متن کاملEffect of the temperature profile of the accretion disk on the structure of jets and outflows around protostars
Magnetic fields play an important role in creating, driving, and in the evolution of outflows and jets from protostars and accretion disks. On the other hand, the temperature profile of the accretion disks may also affect the structure of the magnetic field and outflows. In this paper, we use the self-similar method in cylindrical coordinates to investigate the effect of the temperature profile...
متن کاملLocating of massive protostars
NGC 7538 is known to host a 6.7 and 12.2 GHz methanol maser cospatial with a Ultra Compact (UC) H region,
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2013
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361/201321828