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Title:
The Duplicity of IRAS 16293-2422: A Protobinary Star?
Authors:
Wootten, Alwyn
Publication:
Astrophysical Journal v.337, p.858 (ApJ Homepage)
Publication Date:
02/1989
Origin:
APJ; KNUDSEN
Astronomy Keywords:
INFRARED: SOURCES, STARS: BINARIES, STARS: FORMATION, STARS: INDIVIDUAL ALPHANUMERIC: IRAS 16293-2422, STARS: RADIO RADIATION
DOI:
10.1086/167156
Bibliographic Code:
1989ApJ...337..858W

Abstract

Continuum maps at wavelengths of 6 cm and 2 cm of the region surrounding the infrared object IRAS 16293-2422 reveal two related sources, A and B separated by ˜5" (750 AU) along P.A. -50°. These sources lie within the 3 mm continuum source mapped by Mundy, Wilking, and Myers, which located density maxima of the dust disk at the core of the surrounding L1689N molecular cloud. Both the A and B sites of centimeter wave emission probably arise from ionized gas associated with distinct sites of star formation within this dense core. Thus IRAS 16293-2422 presents a rare opportunity to observe a binary system in its earliest stages of formation.

Higher resolution maps reveal that the brighter source, IRAS 16293- 2422A, is comprised of two unresolved sources, Al and A2, separated by 47 AU in projected distance, approximately perpendicular to the line between the more widely separated objects. A modest velocity-segregated cluster of water masers identifies these sources as associated with a bipolar flow, which must be collimated on a scale smaller than 50 AU. The ionized gas apparently exists as a trace constituent in a region where magnetohydrodynamic shocks impinging on the ambient cloud excite maser emission.

Several arguments suggest that object B is less evolved than object A, and may be in a prestellar phase of its evolution. Interaction of the cores containing these objects may explain the complex pattern of the bipolar flow mapped by Wootten and Loren.


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