St 2-22 - another symbiotic star with high-velocity bipolar jets

TL;DR

This study confirms St 2-22 as a jet-producing symbiotic star, revealing high-velocity bipolar jets ejected during a 2005 outburst, using multi-wavelength spectroscopy and photometry.

Contribution

It provides the first detailed analysis of jets in St 2-22, establishing it as a symbiotic system with high-velocity bipolar jets and documenting an unnoticed outburst.

Findings

St 2-22 is confirmed as an S-type symbiotic star.

Bipolar jets with an average velocity of 1700 km/s were observed.

An unnoticed outburst occurred in early 2005.

Abstract

We report finding high-velocity components in the H{\alpha} emission wings of St 2-22 spectra, obtained in 2005. This discovery have encouraged us to start the present study, aiming to show that this little studied object is a jet producing symbiotic system. We used high-resolution optical and low-resolution near infrared spectra, as well as available optical and infrared photometry, to evaluate some of the physical parameters of the St 2-22 components and the characteristics of the jets. The evaluated parameters of the components confirmed that St 2-22 is a S-type symbiotic star. Our results demonstrate that an unnoticed outburst of St 2-22, similar to those in classical symbiotics, occurred in the first half of 2005. During the outburst, collimated, bipolar jets were ejected by the hot component of St 2-22 with an average velocity of about 1700 km/s.