The Discovery of Two Nearby Carbon Dwarfs

February 2003 • 2003ApJ...584L..95L

Authors • Lowrance, Patrick J. • Kirkpatrick, J. Davy • Reid, I. Neill • Cruz, Kelle L. • Liebert, James

Abstract • The comparison of optical and Two Micron All Sky Survey near-infrared photometry for large samples of cataloged proper-motion stars has given us the potential to discover previously unrecognized nearby objects of rare type. In this Letter we present the discovery of two new carbon dwarfs, LSR 2105+2514 and LP 758-43, which were drawn from proper-motion lists and which lie in a sparsely populated part of optical/near-IR color-color space. Their optical spectra, exhibiting absorptions by C2 and/or CN, are discussed. LSR 2105+2514 is believed to lie within 200 pc and would have MKs>=6.7, making it lower in luminosity than any carbon dwarf with a measured trigonometric parallax. LP 758-43, which is not as red but still probably cooler than the best studied carbon dwarfs, is believed to lie within 360 pc. Using our optical/near-infrared selection technique on published lists of proper-motion stars, we hope in the near future to expand further the current sample of carbon dwarfs, which numbers only 31 objects at this writing.


IPAC Authors


Davy Kirkpatrick

Senior Scientist


Patrick Lowrance

Senior Scientist