SIMBAD references

2014MNRAS.439..407S - Mon. Not. R. Astron. Soc., 439, 407-415 (2014/March-3)

6.7 GHz methanol maser variability in Cepheus A.


Abstract (from CDS):

6.7 GHz methanol maser emission from the well-studied star-forming region Cepheus A was monitored with the Torun 32 m radio telescope. We found synchronized and anticorrelated changes of the flux density of the two blueshifted and one redshifted maser features for ∼ 30 per cent of 1340 d of our observations. Two of those features exhibited high-amplitude flux density variations with periods of 84-87 d over the last 290 d interval of the monitoring. We also report on two flares of emission at two different redshifted velocities completely covered during the whole outburst. These flare events lasted 510-670 d and showed a very rapid linear rise and slow exponential decline, which may be caused by variability of the seed flux density. The flux density of the two strongest features dropped by a factor of 2-5 on a time-scale ∼ 22 yr, while other features have not changed significantly during this period, but showed strong variability on time-scales ≲ 5 yr.

Abstract Copyright: © 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2014)

Journal keyword(s): masers - stars: formation - ISM: individual objects: Cep A - radio lines: general

Status at CDS:  

Simbad objects: 8

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