Distances of Dwarf Carbon Stars
Hugh C. Harris, Conard C. Dahn, John P. Subasavage, Jeffrey A. Munn,, Blaise J. Canzian, Stephen E. Levine, Alice B. Monet, Jeffrey R. Pier, Ronald, C. Stone, Trudy M. Tilleman, and William I. Hartkopf
TL;DR
This study measures parallaxes for 20 dwarf carbon stars, revealing their luminosities, velocities, and binary nature, indicating diverse origins including the Galactic disk and halo.
Contribution
It provides the first parallax measurements for a sample of dwarf carbon stars, characterizing their luminosities, velocities, and binary properties.
Findings
Luminosities span nearly two orders of magnitude.
Over half are halo stars, some originate from the Galactic disk.
Three stars are astrometric binaries with orbital sizes of 1-3 AU.
Abstract
Parallaxes are presented for a sample of 20 nearby dwarf carbon stars. The inferred luminosities cover almost two orders of magnitude. Their absolute magnitudes and tangential velocities confirm prior expectations that some originate in the Galactic disk, although more than half of this sample are halo stars. Three stars are found to be astrometric binaries, and orbital elements are determined; their semimajor axes are 1 -- 3 AU, consistent with the size of an AGB mass-transfer donor star.
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