The Maser Source S140-H2O as a Protoplanetary Disk

Details The Maser Source S140-H2O as a Protoplanetary Disk The Maser Source S140-H2O as a Protoplanetary Disk

Feb 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001arep...45..113l&link_type=abstract

Astronomy Reports, Volume 45, Issue 2, February 2001, pp.113-119

Astronomy and Astrophysics

Astronomy

7

Scientific paper

We present the observations of the H2O maser in S140 with the 22-m radio telescope of the Pushchino Radio Astronomy Observatory in 1992 1999. The H2O maser emission is mainly concentrated in three symmetrically placed narrow radial-velocity intervals. In contrast to our earlier observations (1981 1991), we did not detect emission simultaneously in all three intervals; instead, the emission appeared successively in each. We discuss possible origins for this behavior. To explain the flux variability and radial-velocity drift of the main components, we propose a model with Keplerian orbital motion of clumps (protoplanets) and calculate their orbital parameters.

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