A study of Upgren 1

Details A study of Upgren 1 A study of Upgren 1

Sep 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...332..917g&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 332, Sept. 15, 1988, p. 917-920. Research supported by the Frick Foundation

Astronomy and Astrophysics

Astrophysics

10

Astrometry, Astronomical Photometry, F Stars, Galactic Clusters, Open Clusters, Stellar Motions, Astronomical Catalogs, Radial Velocity, Stellar Luminosity, Stellar Spectra

Scientific paper

Upgren and Rubin have suggested that a small group of bright F stars, in the direction of the galactic north pole, may be the remnant of an old cluster. Utilizing the multichannel astrometric photometer (MAP) the authors have determined the parallaxes of six of the candidate stars with an average precision of 1.1 thousandths of an arcsecond (1.1 mas). The derived distances are, as suggested, similar, and an unusual space density of F stars seems indicated. However, the derived space velocities indicate that the proposed cluster is composed of members of two dynamically different groups.

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