SIMBAD references

2004MNRAS.355..553G - Mon. Not. R. Astron. Soc., 355, 553-584 (2004/December-1)

Long-term monitoring of 6.7-GHz methanol masers.

GOEDHART S., GAYLARD M.J. and VAN DER WALT D.J.

Abstract (from CDS):

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.

Abstract Copyright: 2004 RAS

Journal keyword(s): masers - stars: formation - ISM: clouds - HII regions - radio lines: ISM

Simbad objects: 102

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