Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003arep...47..838l&link_type=abstract
Astronomy Reports, vol. 47, Issue 10, p.838-847
Astronomy and Astrophysics
Astronomy
3
Scientific paper
We report the results of monitoring the H2O maser in NGC 7538, which is associated with a star-forming region. The observations were carried out on the 22-meter telescope of the Pushchino Radio Astronomy Observatory. Two intervals of long-term variability of the integrated flux that reflect the cyclic activity of the maser have been distinguished (1981 1992 and 1993 2003); the data for the earlier activity cycle, 1981 1992, have been analyzed. The period of the long-time-scale variations is about 13 14 years. Flares of individual spectral features and of two groups of features with mean radial velocities of -60 and -46.6 km/s have been observed. The flares lasted from 0.3 to 1 year. The emission features observed during the 1984 1985 flare at radial velocities between -62 and -58 km/s probably form a spatially compact group of spots (<1015 cm) in NGC 7538 IRS 1. The triplet structure of the spectra can be traced. The observed anticorrelations and correlations of the fluxes of the triplet components suggest that the maser spots may be located either in a protoplanetary disk or in a high-velocity gaseous outflow.
Lekht E. E.
Munitsyn V. A.
Tolmachev A. M.
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