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B335 - Protostar or embedded pre-main-sequence star?

Chandler, C. J., Gear, Walter Kieran, Sandell, G., Hayashi, S., Duncan, W. D., Griffin, Matthew Joseph and Hazella, S. 1990. B335 - Protostar or embedded pre-main-sequence star? Monthly Notices of the Royal Astronomical Society 243 , pp. 330-335.

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Abstract

High-resolution submillimeter continuum observations of the far-infrared source in the isolated Bok globule B335 have been made using the JCMT. The continuum source is resolved perpendicular to the axis of the accompanying outflow in an 8 arcsec beam, but unresolved parallel to it. It is concluded that it is a very dense core of dust and gas surrounding a central protostellar or pre-main-sequence object. It is found that this core is able to collimate an initially isotropic wind into its observed bipolar structure. The central object does not appear to fit the currently popular models for protostellar evolution, because of its high A(v), low luminosity, and the presence of an outflow. Three alternatives are proposed to explain these features: (1) outflow is possible from protostars much younger than had previously been expected; (2) the luminosity source is a more evolved protostar with an outflow, that has unusually low mass and/or accretion efficiency, and the high A(v) is due to the orientation of the source; or (3) the source is already well-evolved and is a pre-main-sequence star that, for some reason, has remained deeply embedded.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Uncontrolled Keywords: Infrared sources(astronomy) ; Molecular clouds ; Pre-main sequence stars ; Protostars ; Stellar evolution ; Astronomical models ; Astronomical spectroscopy ; Far infrared radiation ; Herbig-Haro objects ; Stellar winds.
Publisher: Wiley-Blackwell
ISSN: 0035-8711
Last Modified: 04 Jun 2017 02:07
URI: http://orca.cf.ac.uk/id/eprint/9304

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