The Detection of an Extended Moving Group Near the Galactic Disk

Details The Detection of an Extended Moving Group Near the Galactic Disk The Detection of an Extended Moving Group Near the Galactic Disk

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.8603c&link_type=abstract

American Astronomical Society, 181st AAS Meeting, #86.03; Bulletin of the American Astronomical Society, Vol. 24, p.1261

Astronomy and Astrophysics

Astronomy

Scientific paper

A radial velocity survey (median velocity precision ~ 1.0 km s(-1) ) for 879 field stars in the direction (l,b) = (277(deg) ,9(deg) ) has been undertaken with ARGUS --- the bench-mounted echelle spectrograph at the CTIO 4.0m telescope. The radial velocity histogram shows a marked overabundance of stars in the range 74.0 -- 76.0 km s(-1) . We observe 18 stars in this interval whereas only five such stars (within our ~ 1(deg) field) are expected on the basis of the Institute for Advanced Study Galaxy Model. Monte Carlo simulations indicate that this feature is significant at better than the 99% level. B,V CCD photometry is available for 4 of the 18 stars --- the remaining stars have B,V magnitudes determined from APM scans of B_j and R UK-Schmidt plates. Although the scatter in the photometry is appreciable, 14 of the stars occupy a roughly horizontal locus in the field color-magnitude diagram. Various considerations lead us to suspect that they are giants in an extended moving group at a distance of approximately 6 -- 12 kpc, the large range being due to uncertainties concerning the age and metallicity of the group.

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