Variable hydroxyl and methanol masers in G 351.78-0.54

Details Variable hydroxyl and methanol masers in G 351.78-0.54 Variable hydroxyl and methanol masers in G 351.78-0.54

Jun 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996mnras.280..868m&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 280, Issue 3, pp. 868-876.

Astronomy and Astrophysics

Astronomy

14

Masers, Stars: Formation, Ism: Individual: G 351.78-0.54, Ism: Molecules

Scientific paper

The results of monitoring the 1.6-GHz hydroxyl and 6.7-GHz methanol masers in the star-forming region G351.78-0.54 from 1993 to mid-1995 are reported. Variations with time-scales of a few months are superimposed on long-term changes with a time-scale of years in the brightest 1.665- and 1.667-GHz maser peaks and in both 6.7-GHz maser peaks. The methanol maser feature at +1.2 km s^-1 flared at least seven times, varying in brightness from 50 to 300 Jy. Each flare began at the redshifted end of the feature, taking between 10 and 35d to progress to the blueshifted end. The methanol maser feature at +1.7 km s^-1 experienced smaller changes, the peak flux varying between 150 and 210 Jy. No phase lag was seen across this peak or the 1.665-GHz hydroxyl maser peak at -1.8 km s^-1 during variations.

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