The Properties of the Galactic Globular Cluster NGC 4833

Details The Properties of the Galactic Globular Cluster NGC 4833 The Properties of the Galactic Globular Cluster NGC 4833

May 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...196.4105m&link_type=abstract

American Astronomical Society, 196th AAS Meeting, #41.05; Bulletin of the American Astronomical Society, Vol. 32, p.740

Astronomy and Astrophysics

Astronomy

Scientific paper

We present the first CCD photometry for the Galactic globular cluster NGC 4833. Our BVI color magnitude diagrams (CMD) extend from above the red giant branch (RGB) tip to several magnitudes below the main sequence turn off. The cluster horizontal branch (HB) is predominately blueward of the instability strip with 13 confirmed RR Lyrae variables and 5 additional RR Lyrae candidates. The principal sequences of the cluster are well-defined but show the effects of differential reddening. To correct for this, we have created a local extinction map, which is consistent with IRAS and COBE/DIRBE maps of the region. Using the corrected photometry, we determine the mean V magnitude of the HB from the confirmed RR Lyrae variables, the metallicity of the cluster, and the absolute reddening in the direction of NGC 4833. Finally, from the main sequence turnoff, we estimate an age for the cluster.

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