Long-term monitoring of 6.7-GHz methanol masers

Details Long-term monitoring of 6.7-GHz methanol masers Long-term monitoring of 6.7-GHz methanol masers

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004mnras.355..553g&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 355, Issue 2, pp. 553-584.

Astronomy and Astrophysics

Astronomy

50

Masers, Stars: Formation, Ism: Clouds, Hii Regions, Radio Lines: Ism

Scientific paper

A sample of 54 6.7-GHz methanol masers was monitored using the Hartebeesthoek 26-m telescope during the period 1999 January - 2003 March. The observations were taken at 1-2 week intervals, with daily observations when possible if a source was seen to be varying rapidly. It was found that the majority of the sources display a significant level of variability. The time-range of variations range from a few days up to several years. The types of behaviour observed included non-varying, monotonic increases or decreases, as well as aperiodic, quasi-periodic and periodic variations. Seven sources show clear evidence of periodicity, with periods ranging from 132 d up to 520 d.

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