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2009MNRAS.394..900C - Mon. Not. R. Astron. Soc., 394, 900-915 (2009/April-1)
Unveiling the birth and evolution of the HII region Sh2-173.
CICHOWOLSKI S., ROMERO G.A., ORTEGA M.E., CAPPA C.E. and VASQUEZ J.
Abstract (from CDS):
On the other hand, Sh2-173 is located in a dense edge of a large (∼5°) Hi shell, GSH117.8+1.5-35. The possibility of Sh2-173 being part of a hierarchical system of three generations is suggested. In this scenario, the large Hi shell, which probably originated due to the action of CasOB5, would have triggered the formation of Sh2-173, which, in turn, is triggering new stars in its surrounding molecular cloud. To test this hypothesis, the ages of both the Hii region and the large shell were estimated and compared. We concluded that Sh2-173 is a young Hii region of about 0.6-1.0 Myr old. As for the large shell, we obtained a dynamical age of 5±1 Myr. These age estimates, together with the relative location of the different structures, support the hypothesis that Sh2-173 is part of a hierarchical system.
Abstract Copyright: © 2009 The Authors. Journal compilation © 2009 RAS
Journal keyword(s): stars: formation - Hii regions - ISM: individual: Sh2-173 - ISM: kinematics and dynamics
VizieR on-line data: <Available at CDS (J/MNRAS/394/900): table6.dat>
Nomenclature: Table 6: [CRO2009] NN (Nos 1-46). Fig. 7: [CRO2009] Cloud A (Nos A-B). Fig. 9: [CRO2009] gN (Nos g1-G4).
Status at CDS : All or part of tables of objects could be ingested in SIMBAD with priority 2. // All or part of tables of objects will not be ingested in SIMBAD.
Simbad objects: 44
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