Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...138..205g&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 138, no. 1, Sept. 1984, p. 205-211.
Astronomy and Astrophysics
Astrophysics
35
Gas Dynamics, Molecular Clouds, Protostars, Stellar Envelopes, Stellar Evolution, Ammonia, Astronomical Maps, Disks (Shapes), Gravitational Collapse, Molecular Spectra, Ring Structures
Scientific paper
NH3 observations towards the Cep A molecular cloud reveal a circumstellar torus to be the relic of a recent star forming process. The physical characteristics of the torus are derived by fitting synthetic line profiles to the data. The line shapes are consistent with Keplerian orbits around a central source and contraction (or expansion) of the torus. The radial velocity is about 0.8 km/s and the rotational motion about 0.8 km/s x the square root of R0/R, with a radius of about 0.35 pc the outer boundary. The disk is warm (kinetic temperature about 50 K) and massive (about 15 solar masses). It fits into the evolutionary scheme of a collapsing interstellar cloud, possessing sufficient angular momentum to form a large-scale rotating ring in its equatorial plane. A ratio beta between the initial rotational and gravitational energy of the protodisk of a few tenths is derived.
Chini Rolf
Guesten Rolf
Neckel Th.
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