Cool dwarfs stars from the Torino Observatory Parallax Program

TL;DR

This study measures parallaxes and proper motions of 27 high proper motion red stars, identifying nearby stars and subdwarfs, and comparing results with existing data to infer stellar properties.

Contribution

It provides new parallax measurements for 27 red stars, including 22 within 25 parsecs, and analyzes their properties and classifications.

Findings

22 stars are within 25 parsecs.

4 stars are identified as subdwarfs.

Most measurements agree with published data within 2σ.

Abstract

We investigate and parameterise high proper motion red stars in the Torino Observatory Parallax Program. Observations of 27 objects were made over the period 1994 - 2001 on the 1.05m Torino telescope. The trigonometric parallaxes and proper motions were determined using standard techniques. We determine parallaxes and proper motions, and by comparison to models we infer masses, ages, and {metallicities}. Of the 27 objects, 22 are within 25pc and 4 appear to be subdwarfs. There are published parallaxes for 18 objects, and all but 4 agree to within 2$\sigma$. The discrepancies are discussed.