High angular resolution imaging of the circumstellar material around intermediate mass (IM) stars

Details High angular resolution imaging of the circumstellar material around intermediate mass (IM) stars High angular resolution imaging of the circumstellar material around intermediate mass (IM) stars

2007-05-25

arxiv.org/abs/0705.3725v1

Astrophys.Space Sci.313:135-139,2008

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures. Proceedings of the conference "Science with ALMA: a new era for Astrophysics" hold in Madrid in November,

Scientific paper

10.1007/s10509-007-9628-z

In this Paper we present high angular resolution imaging of 3 intermediate-mass (IM) stars using the Plateau de Bure Interferometer (PdBI). In particular we present the chemical study we have carried out towards the IM hot core NGC 7129--FIRS 2. This is the first chemical study in an IM hot core and provides important hints to understand the dependence of the hot core chemistry on the stellar luminosity. We also present our high angular resolution (0.3") images of the borderline Class 0-Class I object IC1396 N. These images trace the warm region of this IM protostar with unprecedent detail (0.3"\sim200 AU at the distance of IC1396 N) and provide the first detection of a cluster of IM hot cores. Finally, we present our interferometric continuum and spectroscopic images of the disk around the Herbig Be star R Mon. We have determined the kinematics and physical structure of the disk associated with this B0 star. The low spectral index derived from the dust emission as well as the flat geometry of the disk suggest a more rapid evolution of the disks associated with massive stars. In the Discussion, we dare to propose a possible evolutionary sequence for the warm circumstellar material around IM stars.

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