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The accretion burst of the massive young stellar object G323.46 -0.08 by Wolf, V.; Stecklum, B.; Garatti, A. Caratti o; Boley, P. A.; Fischer, Ch.; Harries, T.; Eislöffel, J.; Linz, H.; Ahmadi, A.; Kobus, J.; Haubois, X.; Matter, A.; Cruzalebes, P. is a scholarly article available to read on EtoBox.

What is The accretion burst of the massive young stellar object G323.46 -0.08 about?

Accretion bursts from low-mass young stellar objects (YSOs) are known for many decades. In recent years, the first accretion bursts of massive YSOs (MYSOs) have been observed. These phases of intense protostellar growth are of particular importance for studying massive star formation. Bursts of MYSOs are accompanied by flares of Class II methanol masers (hereafter masers), caused by an increase in exciting mid-infrared (MIR) emission. The G323.46$-$0.08 (hereafter G323) event extends the small sample of known MYSO bursts. Maser observations of the MYSO G323 show evidence of a flare, which was presumed to be caused by an accretion burst. This should be verified with IR data. We used time-dependent radiative transfer (TDRT) to characterize the heating and cooling timescales for eruptive MYSOs and to infer the main burst parameters. The G323 accretion burst is confirmed. It reached its peak in late 2013/early 2014 with a Ks-band increase of 2.5mag. TDRT indicates that the duration of the thermal afterglow in the far-infrared (FIR) can exceed the burst duration by years. The latter was proved by SOFIA observations, which indicate a flux increase of $(14.2\pm4.6)$% at $70\, \rm \mu m$ a

Author

Wolf, V.; Stecklum, B.; Garatti, A. Caratti o; Boley, P. A.; Fischer, Ch.; Harries, T.; Eislöffel, J.; Linz, H.; Ahmadi, A.; Kobus, J.; Haubois, X.; Matter, A.; Cruzalebes, P.

Published

2024

Language

EN