Herschel observations of B1-bS and B1-bN: two first hydrostatic core candidates in the Perseus star-forming cloud - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Astronomy and Astrophysics - A&A Année : 2012

Herschel observations of B1-bS and B1-bN: two first hydrostatic core candidates in the Perseus star-forming cloud

Stefano Pezzuto
D. Elia
  • Fonction : Auteur
E. Schisano
  • Fonction : Auteur
F. Strafella
  • Fonction : Auteur
A. Facchini
  • Fonction : Auteur
V. Könyves
  • Fonction : Auteur
M. Pestalozzi
  • Fonction : Auteur
D. Polychroni
  • Fonction : Auteur
K. L. J. Rygl
  • Fonction : Auteur

Résumé

We report far-IR Herschel observations obtained between 70 $\mu$m and 500 $\mu$m of two star-forming dusty condensations, B1-bS and 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 of the 6 PACS and SPIRE photometric bands without being visible in the Spitzer map at 24 $\mu$m. B1-bN is clearly detected between 100 $\mu$m and 250 $\mu$m. 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 SEDs. At least a two-component model, consisting of a central source surrounded by a dusty envelope is required. 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 the mutual interactions between two forming stars at a very early stage of their evolution to be studied.

Dates et versions

hal-00839152 , version 1 (27-06-2013)

Identifiants

Citer

Stefano Pezzuto, D. Elia, E. Schisano, F. Strafella, J. Di Francesco, et al.. Herschel observations of B1-bS and B1-bN: two first hydrostatic core candidates in the Perseus star-forming cloud. Astronomy and Astrophysics - A&A, 2012, 547, pp.id.A54. ⟨10.1051/0004-6361/201219501⟩. ⟨hal-00839152⟩
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