Query : 2007A&A...469..207C

2007A&A...469..207C - Astronomy and Astrophysics, volume 469, 207-211 (2007/7-1)

High-resolution study of a star-forming cluster in the Cepheus A HW2 region.


Abstract (from CDS):

Due to its relatively small distance (725pc), the Cepheus A East star-forming region is an ideal laboratory to study massive star formation processes. Based on its morphology, it has been suggested that the flattened molecular gas distribution around the YSO HW2 may be a 350-AU-radius massive protostellar disk. The goal of our work is to ascertain the nature of this structure. We have employed the Plateau de Bure Interferometer to acquire (sub-)arcsecond-resolution imaging of high-density and shock tracers, such as methyl cyanide (CHTHCN) and silicon monoxide (SiO), towards the HW2 position. On the 1'' (∼725AU) scale, the flattened distribution of molecular gas around HW2 appears to be due to the projected superposition, on the plane of the sky, of at least three protostellar objects, of which at least one is powering a molecular outflow at a small angle with respect to the line of sight. The presence of a protostellar disk around HW2 is not ruled out, but such structure is likely to be detected on a smaller spatial scale, or using different molecular tracers.

Abstract Copyright:

Journal keyword(s): stars: formation - instrumentation: high angular resolution - instrumentation: interferometers - ISM: molecules - ISM: jets and outflows

VizieR on-line data: <Available at CDS (J/A+A/469/207): list.dat sp/*>

Nomenclature: Fig.1: [CSE2007] HC N=1, [CSE2007] HCN (Nos HC2, HC3).

Simbad objects: 5

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Number of rows : 5
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 IRAS 20126+4104 Y*O 20 14 25.8816769656 +41 13 36.879427236           B2.5-B0.5 431 0
2 NAME Cepheus A SFR 22 56 17.9 +62 01 49           ~ 730 2
3 NAME Cep A HW 2 Y*O 22 56 17.9 +62 01 49           B0.5 218 0
4 [CSE2007] HC2 PoC 22 56 17.9 +62 01 50           ~ 2 0
5 NAME HC in Cep A PoC 22 56 17.970 +62 01 49.70           ~ 2 0

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