Protostars in Orion: New results from the Herschel Orion Protostar Survey Key Program

Details Protostars in Orion: New results from the Herschel Orion Protostar Survey Key Program Protostars in Orion: New results from the Herschel Orion Protostar Survey Key Program

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21725515a&link_type=abstract

American Astronomical Society, AAS Meeting #217, #255.15; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

We present new far-IR photometry results on 131 proto-stars from the Herschel Orion Protostar Survey (HOPS). HOPS is a 200-hour Herschel key program that will systematically survey 286 protostars encompassing a wide range of source luminosities, evolutionary phases, and environments in a single molecular cloud in the 60-210 micron window where we will sample the peak of the thermal emission from the protostellar envelope. We will focus on PACS imaging at 70 and 160 um taken as part of the imaging component of the HOPS program. From these data we extract 70 and 160 um photometry which are then combined with existing ground-based and HST near-IR imaging, IRAC and MIPS 3-24 um photometry and IRS 5-35 um spectra to create 1.6-160 um SEDs. These SEDS are integrated to find the bolometric luminosities and compared to the results of radiative transfer models (Whitney et al. 2003, ApJ, 591, 1049) to constrain the envelope morphologies, envelope densities, and infall rates. Our initial results (Fischer et al. 2010, A&A, 518, L122) on only protostars 4 stars showed a range of evolutionary states for the protostars. In this contribution, we extend our sample to 131 protostars -- the first large survey of its kind in the far-IR. We will examine the distribution of luminosities and SED properties as a function of environment. We will also present preliminary fits to radiative transfer models of the protostars.

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