The Solar Neighborhood. XXII. Parallax Results from the CTIOPI 0.9m Program: Trigonometric Parallaxes of 64 Nearby Systems with 0\farcs5 $\leq \mu \leq$ 1\farcs0 yr$^{-1}$ (SLOWMO sample)

TL;DR

This paper reports new trigonometric parallaxes for 64 nearby stellar systems, most of which are within 25 parsecs, enhancing the census of southern hemisphere stars and providing detailed astrometric and photometric data.

Contribution

It provides the first parallaxes for 58 systems and includes measurements for multiple systems, improving the accuracy of nearby star catalogs.

Findings

56 of the systems are within 25 parsecs of the Sun.

52 of these are in the southern hemisphere.

5.7% of known southern 25 parsec systems are included.

Abstract

We present trigonometric parallaxes of 64 stellar systems with proper motions between 0\farcs5 yr$^{-1}$ and 1\farcs0 yr$^{-1}$ from the ongoing RECONS (Research Consortium On Nearby Stars) parallax program at CTIO (the Cerro Tololo Interamerican Observatory). All of the systems are south of DEC $= +30$, and 58 had no previous trigonometric parallaxes. In addition to parallaxes for the systems, we present proper motions, Johnson-Kron-Cousins $VRI$ photometry, variability measurements, and spectral types. Nine of the systems are multiple; we present results for their components, three of which are new astrometric detections. Of the 64 systems, 56 are within 25 parsecs of the Sun and 52 of those are in the southern hemisphere, comprising 5.7\% of the total number of known southern 25 parsec systems.