V645 Cygni - A decelerating molecular outflow?

Astronomy and Astrophysics – Astronomy

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Interstellar Matter, Radio Astronomy, Rotational Spectra, Star Formation, Stellar Mass Ejection, Carbon Isotopes, Carbon Monoxide, Molecular Gases, Stellar Luminosity, Stellar Winds

Scientific paper

V645 Cygni (AFGL 2789) is a young stellar object associated with a bipolar molecular outflow with a modest degree of collimation. This paper presents IRAM 30-m observations of the CO(J = 2 - 1), (C-13)O (J = 1 - 0) and (C-18)O rotational transition lines toward this region. At relatively low velocities the molecular outflow presents a bipolarity in the north-south direction, with the red and blueshifted CO lobes separated by about 20 arcsec. This angular separation decreases as the velocity increases. At higher velocities the outflow appears isotropic. The physical parameters obtained for the V645 Cyg molecular outflow are much lower than the parameters derived for other outflows with exciting sources of similar luminosities. In particular, this result makes it possible that radiation pressure may be responsible for generating the stellar wind associated with V645 Cyg.

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