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A Protoplanetary Disk in V645 Cyg As Seen with H2O and Methanol Masers

Published online by Cambridge University Press:  12 April 2016

I.E. Val’tts ,
V.I. Slysh ,
M.A. Voronkov  and
V. Migenes
I.E. Val’tts
Affiliation:
Astro Space Center, Profsouznaya St. 84/32, 117997 Moscow, Russia
V.I. Slysh
Affiliation:
Astro Space Center, Profsouznaya St. 84/32, 117997 Moscow, Russia; Arecibo Observatory, HC 3 Box 53995, Arecibo PR 00612, USA
M.A. Voronkov
Affiliation:
Astro Space Center, Profsouznaya St. 84/32, 117997 Moscow, Russia
V. Migenes
Affiliation:
University of Guanajuato, Department of Astronomy, Apdo Postal 144, Guanajuato, CP36000, GTO, Mexico

Abstract

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Radio images of maser spots in the infrared source RAFGL 2789, connected with the young stellar object V645 Cyg, have been obtained as a result of radio interferometric observations of the H2O maser at 22 GHz and the methanol maser at 6.7 GHz, with the VLBI arrays VLBA and EVN. It is shown that the position of the masers coincides with the optical object within 02. The maser spots are located along the line North-South, and their position and radial velocity can be described by a model of a Keplerian disk with a maximum radius of 40 AU for the H2O maser and 800 AU for the methanol maser. The H2O and methanol maser spots have not been resolved, and lower limits of the brightness temperature are 2 × 1013 K and 1.4 × 109 k respectively. A model of the maser is suggested in which the maser emission is generated in extended water and methanol envelopes of icy planets orbiting the young star.

Type
Research Article
Information
International Astronomical Union Colloquium , Volume 187: Exotic Stars as Challenges to Evolution , 2002 , pp. 279 - 284
Copyright
Copyright © Astronomical Society of the Pacific 2002

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