Year: 2018
Type: article
Abstract: We present the discovery of expanding spherical shells around low- to intermediate-mass young stars in the Orion A giant molecular cloud using observations of 12 CO (1–0) and 13 CO (1–0) from the Nobeyama Radio Observatory 45 m telescope. The shells have radii from 0.05 to 0.85 pc and expand outward at 0.8–5 km s−1. The total energy in the expanding shells is comparable to protostellar outflows in the region. Together, shells and outflows inject enough energy and momentum to maintain the cloud turbulence. The mass-loss rates required to power the observed shells are two to three orders of magnitude higher than predicted for line-driven stellar winds from intermediate-mass stars. This discrepancy may be resolved by invoking accretion-driven wind variability. We describe in detail several shells in this paper and present the full sample in the online journal.
Source: The Astrophysical Journal
Authors: Jesse R. Feddersen, Héctor G. Arce, Shuo Kong, Yoshito Shimajiri, Fumitaka Nakamura, Chihomi Hara, Shun Ishii, Kazushige Sasaki, Ryohei Kawabe
Institutions: Yale University, Centre National de la Recherche Scientifique, Commissariat à l'Énergie Atomique et aux Énergies Alternatives, Astrophysique, Instrumentation et Modélisation, CEA Paris-Saclay, Université Paris Diderot, National Astronomical Observatory of Japan, The University of Tokyo, Atacama Large Millimeter Submillimeter Array, Niigata University
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W2807071248