Results from HOPS: A multiwavelength census of Orion protostars
Identifieur interne : 000003 ( Main/Exploration ); précédent : 000002; suivant : 000004Results from HOPS: A multiwavelength census of Orion protostars
Auteurs : W. J. Fischer [États-Unis] ; S. T. Megeath [États-Unis] ; A. M. Stutz [Allemagne, États-Unis] ; J. J. Tobin [États-Unis] ; B. Ali [États-Unis] ; T. Stanke [Allemagne] ; M. Osorio [Espagne] ; E. Furlan [États-Unis] ; the HOPS teamSource :
- Astronomische Nachrichten [ 0004-6337 ] ; 2013-02.
English descriptors
Abstract
Surveys with the Spitzer and Herschel 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 Herschel Orion Protostar Survey (HOPS), which targets 328 Spitzer ‐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 Spitzer ‐identified sample. We have detected over 100 new sources in the Herschel 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)
Url:
DOI: 10.1002/asna.201211761
Affiliations:
- Allemagne, Espagne, États-Unis
- Andalousie, Bade-Wurtemberg, Bavière, District de Haute-Bavière, District de Karlsruhe
- Garching bei München, Heidelberg
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We have detected over 100 new sources in the Herschel 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)</div></front></TEI><affiliations><list><country><li>Allemagne</li><li>Espagne</li><li>États-Unis</li></country><region><li>Andalousie</li><li>Bade-Wurtemberg</li><li>Bavière</li><li>District de Haute-Bavière</li><li>District de Karlsruhe</li></region><settlement><li>Garching bei München</li><li>Heidelberg</li></settlement></list><tree><noCountry><name sortKey="The Hops Team" sort="The Hops Team" uniqKey="The Hops Team" last="The Hops Team">the HOPS team</name></noCountry><country name="États-Unis"><noRegion><name sortKey="Fischer, W J" sort="Fischer, W J" uniqKey="Fischer W" first="W. J." last="Fischer">W. J. 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