IRAS 22150+6109 - a young B-type star with a large disc

TL;DR

This study characterizes IRAS 22150+6109 as a young B-type star with a large circumstellar disc, using spectroscopic analysis and SED modeling, revealing its pre-main-sequence status and disc properties.

Contribution

It provides detailed spectroscopic and SED analysis of IRAS 22150+6109, identifying its spectral type, disc structure, and evolutionary stage, which was previously not well understood.

Findings

Spectral type B3 identified from optical spectrum.

Presence of a large circumstellar disc with an inner edge at 550 au.

Star is in a short pre-main-sequence evolutionary phase.

Abstract

We present the results of a spectroscopic analysis and spectral energy distribution (SED) modelling of the optical counterpart of the infrared source IRAS 22150+6109. The source was suggested to be as a Herbig Be star located in the star forming region L 1188. Absorption lines in the optical spectrum indicate a spectral type B3, while weak Balmer emission lines reflect the presence of a circumstellar gaseous disc. The star shows no excess radiation in the near-infrared spectral region and a strong excess in the far-infrared that we interpret as radiation from a large disc, whose inner edge is located very far from the star (550 au) and does not attenuate its radiation. We conclude that IRAS 22150+6109 is an intermediate-mass star that is currently undergoing a short pre-main-sequence evolutionary stage.