Pezzuto, S.; Elia, D.; Schisano, E.; Strafella, F.; Di Francesco, J.; Sadavoy, S.; André, P.; Benedettini, M.; Bernard, J. P.; di Giorgio, A. M.; Facchini, A.; Hennemann, M.; Hill, T.; Könyves, V.; Molinari, S.; Motte, F.; Nguyen-Luong, Q.; Peretto, N.; Pestalozzi, M.; Polychroni, D.; Rygl, K. L. J.; Saraceno, P.; Schneider, N.; Spinoglio, L.; Testi, L.; Ward-Thompson, D. and White, G. J.
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|DOI (Digital Object Identifier) Link:||http://doi.org/10.1051/0004-6361/201219501|
|Google Scholar:||Look up in Google Scholar|
We report far-infrared Herschel observations obtained between 70 μm and 500 μm of two star-forming dusty condensations, [HKM99] B1-bS and [HKM99] B1-bN, in the B1 region of the Perseus star-forming cloud. In the western part of the Perseus cloud, B1-bS 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.
|Item Type:||Journal Article|
|Copyright Holders:||2012 ESO|
|Extra Information:||13 pp.|
|Keywords:||protostars; HKM99; B1-bS; B1-bN; EYG2006; Bolo 81; EDJ2009; 295|
|Academic Unit/Department:||Science > Physical Sciences
|Interdisciplinary Research Centre:||Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)|
|Depositing User:||G. J. White|
|Date Deposited:||13 Nov 2012 15:56|
|Last Modified:||25 Feb 2016 03:10|
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