Results from HOPS: A multiwavelength census of Orion protostars. Issue 1 (6th February 2013)

• Record Type: Journal Article
• Authors: Fischer, W.J.; Megeath, S.T.; Stutz, A.M.; Tobin, J.J.; Ali, B.; Stanke, T.; Osorio, M.; Furlan, E.; the HOPS team
• Is Part Of: Astronomische Nachrichten. Volume 334:Issue 1/2(2013)
• Page Start: 53
• Page End: 56
• Publication Date: 2013-02-06
• Subjects: Astronomy -- Periodicals; 520.5
• DOI: 10.1002/asna.201211761
• Languages: English
• ISSNs: 0004-6337

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>Surveys with the <italic>Spitzer</italic> and <italic>Herschel</italic> space observatories are now enabling the discovery and characterization of large samples of protostars in nearby molecular clouds, providing the observational basis for a detailed understanding of star formation in diverse environments. We are pursuing this goal with the <italic>Herschel</italic> Orion Protostar Survey (HOPS), which targets 328 <italic>Spitzer</italic> ‐identified protostars in the Orion molecular clouds, the largest star‐forming region in the nearest 500 pc. The sample encompasses all phases of protostellar evolution and a wide range of formation environments, from dense clusters to relative isolation. With a grid of radiative transfer models, we fit the 1–870 µm spectral energy distributions (SEDs) of the protostars to estimate their envelope densities, cavity opening angles, inclinations, and total luminosities. After correcting the bolometric luminosities and temperatures of the sources for foreground extinction and inclination, we find a spread of several orders of magnitude in luminosity at all evolutionary states, a constant median luminosity over the more evolved stages, and a possible deficit of high‐inclination, rapidly infalling envelopes among the <italic>Spitzer</italic> ‐identified sample. We have detected over 100 new sources in the <italic>Herschel</italic> images; some of them may fill this deficit. We also report results from modeling the pre‐ and post‐outburst 1–870 µm SEDs of V2775 Ori (HOPS 223), a known FU Orionis outburster in the sample. It is the least luminous FU Ori star with a protostellar envelope. (© 2013 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)</p> </abstract>