Searching for radio late-type dwarf stars in the GLEAM-X DR1 catalog

TL;DR

This study introduces a new multi-wavelength data combination method to identify late-type dwarf stars associated with radio sources, successfully finding 12 such stars using GLEAM-X DR1 data and various catalogs.

Contribution

The paper presents a novel approach for combining multi-wavelength data to efficiently identify radio late-type dwarf stars, improving detection reliability.

Findings

12 radio late-type dwarf stars identified

5 stars show ultraviolet excess indicating stellar activity

7 stars have low Rossby numbers suggesting high magnetic activity

Abstract

We have developed a new method of multi-wavelength data combination for the search of late-type radio dwarfs, and have put it into practice using GLEAM-X DR1 data. The initial sample is selected by cross-matching the Gaia/DR3 objects with the probability of being a star no less than 99$\%$, and removing the extragalactic objects assigned by the SIMBAD database. The late-type dwarf stars are judged according to their location in the $(BP-RP)_0/M_{\rm G}$ color-magnitude diagram and in the $(J-H)_0/(K-W1)_0$ near-infrared color-color diagram. Furthermore, stellar activity is searched by ultraviolet excess in the GALEX/NUV band and the Rossby number in the TESS light curves. In total, 12 stars are found to be late-type dwarf stars associated with radio source, which is consisted of five stars with the UV excess and seven stars with the Rossby number less than 0.13. Three of these 12 stars are previously studied to be associated with radio objects. All these 12 stars are considered to be reliable counterparts of radio sources.