1.5-mCTIOPI: A Southern Sky Parallax Investigation

Details 1.5-mCTIOPI: A Southern Sky Parallax Investigation 1.5-mCTIOPI: A Southern Sky Parallax Investigation

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006rmxac..26q.168c&link_type=abstract

XI IAU Regional Latin American Meeting of Astronomy (Eds. L. Infante & M. Rubio) Revista Mexicana de Astronomía y Astrofísica (S

Astronomy and Astrophysics

Astronomy

Scientific paper

Trigonometric parallaxes, proper motions and V_J(RI)_{KC} photometry were obtained for 69 stars studied by the Cerro Tololo Inter-American Observatory Parallax Investigation (CTIOPI), a widely scoped program aimed at discovering and characterizing nearby stars (see: http://www.chara.gsu.edu/thenry/CTIOPI/). The observations were carried out with the CTIO 1.5-m telescope, which targeted the fainter subset of the CTIOPI input list. We discovered 20 new nearby stars (D ≤ 25 pc, the classical limit of the Catalogs of Nearby Stars), three of which lie at distances less than 10 pc: DEN 1048-3956, at 4 pc, DEN 0255-4700 at 4.97 pc, and LP 647-013 at 9.59 pc. Color-magnitude and color-color diagrams, in combination with theoretical isochrones from the literature, tangential velocities, M_R and M_J, aided to identify the general nature of our targets. We have in this way discovered several new subdwarfs and very low mass stars, a few of which could be brown dwarfs.

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