The Solar Neighborhood XXVII: Discovery of New Proper Motion Stars with mu > 0.18 "/yr in the Southern Sky with 16.5 > R_59F > 18.0

TL;DR

This paper reports the discovery of 1584 new proper motion stars in the southern sky with moderate proper motions and faint magnitudes, including nearby stars, white dwarfs, and subdwarfs, expanding the known stellar population.

Contribution

It presents a large new sample of proper motion stars with R_59F between 16.5 and 18.0, including nearby and subdwarf systems, complementing previous surveys and indicating many fainter stars remain undiscovered.

Findings

3 systems estimated within 25 pc, including one possibly within 10 pc

97 white dwarf candidates with distances between 10 and 120 pc

557 cool subdwarf candidates, many redder than previous discoveries

Abstract

Here we present 1584 new southern proper motion systems with mu > 0.18 "/yr and 16.5 > R_59F > 18.0. This search complements the six previous SuperCOSMOS-RECONS (SCR) proper motion searches of the southern sky for stars within the same proper motion range, but with R_59F < 16.5. As in previous papers, we present distance estimates for these systems and find that three systems are estimated to be within 25 pc, including one, SCR 1546-5534, possibly within the RECONS 10 pc horizon at 6.7 pc, making it the second nearest discovery of the searches. We find 97 white dwarf candidates with distance estimates between 10 and 120 pc, as well as 557 cool subdwarf candidates. The subdwarfs found in this paper make up nearly half of the subdwarf systems reported from our SCR searches, and are significantly redder than those discovered thus far. The SCR searches have now found 155 red dwarfs estimated to be within 25 pc, including 10 within 10 pc. In addition, 143 white dwarf candidates and 1155 cool subdwarf candidates have been discovered. The 1584 systems reported here augment the sample of 4724 systems previously discovered in our SCR searches, and imply that additional systems fainter than R_59F = 18.0 are yet to be discovered.