4.7 Article

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

Journal

ASTROPHYSICAL JOURNAL
Volume 554, Issue 1, Pages L91-L94

Publisher

UNIV CHICAGO PRESS
DOI: 10.1086/320921

Keywords

binaries : general; ISM : globules; ISM : individual (BHR 71); ISM : jets and outflows; stars : formation; stars : pre-main-sequence

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New Angle-Australian Telescope near-infrared and Swedish-ESO Submillimetre Telescope (CO)-C-12 J = 2 --> 1 observations are combined with existing Infrared 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 objects, 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 from IRS 1 is much larger in extent, is more massive, and dominates the CO emission. (3) Both protostars are associated with Herbig-Haro objects and shock-excited 2.122 mum H-2 upsilon = 1-0 S(1) emission, which coincide spatially with their CO outflows. (4) IRS 1 is associated with centimeter continuum emission, with a flat or rising spectrum, which is consistent with free-free emission, a signpost of protostellar origin.

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