An IR Survey of Faint Parallax Stars

Details An IR Survey of Faint Parallax Stars An IR Survey of Faint Parallax Stars

Dec 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aas...189.7817g&link_type=abstract

American Astronomical Society, 189th AAS Meeting, #78.17; Bulletin of the American Astronomical Society, Vol. 28, p.1380

Astronomy and Astrophysics

Astronomy

Scientific paper

The observational part of the USNO CCD parallax program, which employed a TI800x800 detector, has recently been completed. The astrometric targets, for which data have not yet been published, include 54 white dwarfs, 34 subdwarfs, and 32 red dwarfs with 14.0 mag < V < 19.5 mag. In order to investigate whether more suitable reference fields could be obtained in the near-infrared, and whether any of these stars have low-mass companions, a survey was initiated in the K bandpass (or 2.2 microns), using the USNO 256x256 HgCdTe IR camera. 113 fields were examined to a limiting K magnitude between 16.5 and 17.0 mag. Only one field (about Gr567) was found with an improved reference frame in the K-bandpass as compared to the CCD R-bandpass, and red objects were detected near the two white dwarfs Gr567 and PG1241. The significance and implications of these results will be discussed.

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