New eruptive variable in the massive star-forming region associated with IRAS 18507+0121 source

TL;DR

This paper reports the discovery of a significant outburst from an embedded young stellar object in a star-forming region, using archival data to analyze its properties and classify its eruptive behavior.

Contribution

It is the first to identify and characterize an eruptive variable in this specific star-forming region, providing detailed photometric analysis and classification.

Findings

Outburst occurred between 2004-2006 with at least 5 magnitude increase in Ks band.

Object classified as an intermediate-mass YSO with Class 0/I stage.

The object shows mixed eruptive characteristics, not fitting classic FUor or EXor types.

Abstract

Aims. We report the discovery of a strong outburst of the embedded young stellar object (YSO), namely UKIDSS-J185318.36+012454.5, located in the star-forming region associated with IRAS 18507+0121 source and GAL 034.4+00.23 HII region. Methods. Using the archival photometric data and images we determined the amplitude and the epoch of the outburst, as well as the evolution stage and the basic parameters of the object. Results. According to the near and mid-infrared colors and spectral energy distribution, we classify the object as an intermediate-mass young stellar object (YSO) with Class 0/I evolution stage. The outburst occurred in the period of 2004-2006. The amplitude of brightness is as least Ks = 5.0 mag. The summation of the photometric and spectral data does not allow to classify UKIDSS-J185318.36+012454.5 as FUor or EXor. We can consider it as an eruptive variable with mixed characteristics or MNor type object.