The faintest stars - Trigonometric CCD parallaxes

Details The faintest stars - Trigonometric CCD parallaxes The faintest stars - Trigonometric CCD parallaxes

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aj....105.1169t&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 105, no. 3, p. 1169-1178.

Physics

Optics

32

Astrometry, Charge Coupled Devices, Dwarf Stars, Faint Objects, Stellar Mass, Stellar Parallax, Cassegrain Optics, Color-Magnitude Diagram, Data Reduction, Late Stars, Trigonometry

Scientific paper

First results are presented from a trigonometric parallax program being carried out with a CCD detector on the 60-inch telescope at Palomar Mountain. New parallaxes for six extremely late M-dwarfs (Mbol above 13) are presented, more than doubling the number of such stars with directly measured distances. Structure in the main sequences constructed with this new parallax data suggest that the faintest known stars may not be stably supported by nuclear burning. It is shown that trigonometric parallaxes with accuracies of no more than 0.004 arcsec can be obtained in a few years using standard CCD equipment on a common-user telescope.

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