Long-term monitoring of the water-vapor maser in NGC 7538: 1993 2003

Details Long-term monitoring of the water-vapor maser in NGC 7538: 1993 2003 Long-term monitoring of the water-vapor maser in NGC 7538: 1993 2003

Mar 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004arep...48..200l&link_type=abstract

Astronomy Reports, vol. 48, Issue 3, p.200-209

Astronomy and Astrophysics

Astronomy

6

Scientific paper

The paper presents the results of monitoring the H2O maser in NGC 7538, which is associated with a star-formation region, in 1993 2003. The observations were carried out on the 22-m radio telescope of the Pushchino Radio Astronomy Observatory (Russia). The variability of the maser emission displays a cyclic character. Two cycles of the long-term variability of the total flux were detected over the entire monitoring period (1981 2003): 1981 1993 and 1994 2003. The period of the variability is about 13 years. An anticorrelation of the emission in lateral sections of the spectra is observed, as is characteristic of protoplanetary disks. A drift in the radial velocity of the central component is observed (V LSR=-60 km/s) with a drift rate of about 0.09 km/s per year. The water-vapor maser is most likely associated with a protoplanetary disk.

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