Issue |
A&A
Volume 416, Number 2, March III 2004
|
|
---|---|---|
Page(s) | 631 - 640 | |
Section | Interstellar and circumstellar matter | |
DOI | https://doi.org/10.1051/0004-6361:20034123 | |
Published online | 27 February 2004 |
L1157: Interaction of the molecular outflow with the Class 0 environment
1
Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA
2
Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, 50125 Firenze, Italy
3
Institut de Radio Astronomie Millimétrique, 300 rue de la Piscine, 38406 Saint Martin d'Hères, France
4
Laboratoire d'Astrophysique de l'Observatoire de Grenoble, BP 53, 38041 Grenoble, France
Corresponding author: F. Gueth, gueth@iram.fr
Received:
28
July
2003
Accepted:
3
December
2003
We present high angular resolution interferometric
observations
of the dust continuum at
2.7 and 1.3 mm, and of the HC3N () and
C18O (
) emission around L1157-mm, a Class 0 object that
drives a spectacular molecular outflow. The millimeter dust emission
is clearly resolved into two components, a flattened compact source of
~
AU at 1.3 mm, and mass ~0.1
, plus
an extended envelope of ~3000 AU at 1.3 mm, and mass
~1.1
. The millimeter spectral index varies throughout
the region, with the lower value found toward the compact protostar,
possibly indicating grain growth in the denser regions. A strong
interaction between the molecular outflow and the close protostellar
environment is taking place and affects the structure of the innermost
parts of the envelope. This is shown by the spatial coincidence
between the molecular outflow and the dust (1.3 mm continuum) and
HC3N emission: both tracers show structures associated to the edges
of the outflow lobes. Basically, the global picture sketched for the
Class 0 object L1157-mm by Gueth et al. ([CITE]) is supported. We find
possible evidence of infall, but we do not detect any velocity
gradient indicative of a rotating circumstellar disk.
Key words: stars: individual: L1157 / stars: formation / stars: circumstellar matter / ISM: dust, extinction / ISM: molecules
© ESO, 2004
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.