IRAS 11590-6452 in BHR 71: A binary protostellar system?

Authors
Citation
Tl. Bourke, IRAS 11590-6452 in BHR 71: A binary protostellar system?, ASTROPHYS J, 554(1), 2001, pp. L91-L94
Citations number
10
Categorie Soggetti
Space Sciences
Journal title
ASTROPHYSICAL JOURNAL
ISSN journal
0004637X → ACNP
Volume
554
Issue
1
Year of publication
2001
Part
2
Pages
L91 - L94
Database
ISI
SICI code
0004-637X(20010610)554:1<L91:I1IB7A>2.0.ZU;2-2
Abstract
New Angle-Australian Telescope near-infrared and Swedish-ESO Submillimetre Telescope (CO)-C-12 J = 2 --> 1 observations are combined with existing Inf rared Space Observatory mid-infrared and Australia Telescope Compact Array centimeter radio continuum observations to examine the protostellar content of the Bok globule BHR 71. Together with observations of Herbig-Haro objec ts, these data show the following: (1) Two protostellar sources, IRS 1 and IRS 2, with a separation of similar to 17" (3400 AU) are located within BHR 71. (2) Each protostar is driving its own molecular outflow. The outflow f rom IRS 1 is much larger in extent, is more massive, and dominates the CO e mission. (3) Both protostars are associated with Herbig-Haro objects and sh ock-excited 2.122 mum H-2 upsilon = 1-0 S(1) emission, which coincide spati ally with their CO outflows. (4) IRS 1 is associated with centimeter contin uum emission, with a flat or rising spectrum, which is consistent with free -free emission, a signpost of protostellar origin.