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http://hdl.handle.net/20.500.12386/32978
Title: | Herschel observations of B1-bS and B1-bN: two first hydrostatic core candidates in the Perseus star-forming cloud | Authors: | PEZZUTO, Stefano ELIA, Davide Quintino SCHISANO, EUGENIO Strafella, F. Di Francesco, J. Sadavoy, S. André, P. BENEDETTINI, Milena Bernard, J. P. DI GIORGIO, Anna Maria Facchini, A. Hennemann, M. Hill, T. Könyves, V. MOLINARI, Sergio Motte, F. Nguyen-Luong, Q. Peretto, N. Pestalozzi, M. Polychroni, D. RYGL, Kazi Lucie Jessica Saraceno, P. Schneider, N. SPINOGLIO, Luigi Giuseppe Maria TESTI, Leonardo Ward-Thompson, D. White, G. J. |
Issue Date: | 2012 | Journal: | ASTRONOMY & ASTROPHYSICS | Number: | 547 | First Page: | A54 | Abstract: | We report far-infrared Herschel observations obtained between 70 μm and 500 μm of two star-forming dusty condensations, <ASTROBJ>[HKM99] B1-bS</ASTROBJ> and <ASTROBJ>[HKM99] B1-bN</ASTROBJ>, in the <ASTROBJ>B1</ASTROBJ> region of the Perseus star-forming cloud. In the western part of the Perseus cloud, <ASTROBJ>B1-bS</ASTROBJ> is the only source detected in all six PACS and SPIRE photometric bands, but it is not visible in the Spitzer map at 24 μm. B1-bN is clearly detected between 100 μm and 250 μm. We have fitted the spectral energy distributions of these sources to derive their physical properties, and find that a simple greybody model fails to reproduce the observed spectral energy distributions. At least a two-component model is required, consisting of a central source surrounded by a dusty envelope. The properties derived from the fit, however, suggest that the central source is not a Class 0 object. We then conclude that while B1-bS and B1-bN appear to be more evolved than a pre-stellar core, the best-fit models suggest that their central objects are younger than a Class 0 source. Hence, they may be good candidates to be examples of the first hydrostatic core phase. The projected distance between B1-bS and B1-bN is a few Jeans lengths. If their physical separation is close to this value, this pair would allow studying the mutual interactions between two forming stars at a very early stage of their evolution. <P />Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA.Appendices are available in electronic form at <A href="http://www.aanda.org">http://www.aanda.org</A> | URI: | http://hdl.handle.net/20.500.12386/32978 | URL: | https://www.aanda.org/articles/aa/full_html/2012/11/aa19501-12/aa19501-12.html http://arxiv.org/abs/1209.5290v1 |
ISSN: | 0004-6361 | DOI: | 10.1051/0004-6361/201219501 | Bibcode ADS: | 2012A&A...547A..54P | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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043FHSC.pdf | Pdf editoriale | 1.09 MB | Adobe PDF | View/Open |
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