BVI Photometry and the Luminosity Function of the Globular Cluster M92

Astronomy and Astrophysics – Astrophysics

Scientific paper

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

22 pages, 13 figures, 3 tables, accepted for publication in AJ

Scientific paper

10.1086/513511

We present new BVI ground-based photometry and VI space-based photometry for the globular cluster M92 (NGC 6341) and examine luminosity functions in B, V, and I containing over 50,000 stars ranging from the tip of the red giant branch to several magnitudes below the main sequence turn off. Once corrected for completeness, the observed luminosity functions agree very well with theoretical models and do not show stellar excesses in any region of the luminosity function. Using reduced chi squared fitting, the new M92 luminosity function is shown to be an excellent match to the previously published luminosity function for M30. These points combine to establish that the "subgiant excess" found in previously published luminosity functions of Galactic globular clusters are due to deficiencies in the stellar models used at that time. Using up to date stellar models results in good agreement between observations and theory. Several statistical methods are presented to best determine the age of M92. These methods prove to be insensitive to the exact choice of metallicity within the published range. Using [Fe/H]=-2.17 to match recent studies we find an age of 14.2 plus or minus 1.2 Gyr for the cluster.

No associations

LandOfFree

Say what you really think

Search LandOfFree.com for scientists and scientific papers. Rate them and share your experience with other people.

Rating

BVI Photometry and the Luminosity Function of the Globular Cluster M92 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with BVI Photometry and the Luminosity Function of the Globular Cluster M92, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and BVI Photometry and the Luminosity Function of the Globular Cluster M92 will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFWR-SCP-O-642269

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.