Pulsations of the water-vapor maser in NGC 7538 IRS 1 with a period of about 0.9 year

Details Pulsations of the water-vapor maser in NGC 7538 IRS 1 with a period of about 0.9 year Pulsations of the water-vapor maser in NGC 7538 IRS 1 with a period of about 0.9 year

Feb 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010arep...54..151l&link_type=abstract

Astronomy Reports, Volume 54, Issue 2, pp.151-155

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We report the results of a study of fast variations of the H2O maser emission toward NGC 7538 IRS 1, which is associated with a star-forming region. The study is based on monitoring data in the 1.35 cm line obtained in 1996-2003 on the 22-meter radio telescope of the Pushchino Radio Astronomy Observatory (Russia). Periodic flux variations of four long-lived emission features with an average period of about 0.9 year have been detected. The flux variations of these features are correlated, suggesting that the detected variability is a consequence of pulsation of, e.g., stellar wind from the protostar in NGC 7538 IRS 1, with a period of about 0.9 year (0.87 ± 0.03 year). These pulsations are superimposed on long-term variability of the integrated maser emission with a period of 13 years.

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