The Age, Extinction and Distance of the Old Metal-Rich Open Cluster NGC 6791

Details The Age, Extinction and Distance of the Old Metal-Rich Open Cluster NGC 6791 The Age, Extinction and Distance of the Old Metal-Rich Open Cluster NGC 6791

Dec 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...193.6710c&link_type=abstract

American Astronomical Society, 193rd AAS Meeting, #67.10; Bulletin of the American Astronomical Society, Vol. 30, p.1346

Physics

Scientific paper

An extensive grid of metal-rich isochrones utilizing the latest available input physics has been calculated for comparison with the old, metal-rich open cluster NGC 6791. The isochrones have been simultaneously fit to BV and VI color magnitude diagrams, with the same composition, reddening and distance modulus required for both colors. Our best fitting isochrone assumes [Fe/H] = +0.4, scaled solar abundance ratios, and Delta Y/Delta Z = 2 (Y = 0.31), yielding an excellent fit to the data at all points along the major sequences. The resulting age is 8 Gyr, with E(B-V) = 0.10 and (m-M)V = 13.42. The derived cluster parameters are fairly robust to variations in the isochrone [Fe/H] and helium abundances. All of the acceptable fits indicate that 0.08 <= E(B-V) <= 0.13, 13.30 <= (m-M)V <= 13.45, and that NGC 6791 has an age of 8.0 +/- 0.5 Gyr. The fits also suggest that Delta Y/Delta Z lies between 1 and 3. A metallicity as low as solar is clearly ruled out, as is Delta Y/Delta Z = 0. Comparison with previous isochrone studies indicates that the derived reddening is primarily due to our use of the most recent color transformations, whereas the age depends upon both the colors and the input physics. Our isochrones provide an excellent fit to the Hyades zero-age main sequence as determined by Hipparcos, providing evidence that our derived reddening and distance modulus are reliable.

Affiliated with

Also associated with

No associations

Rating

The Age, Extinction and Distance of the Old Metal-Rich Open Cluster NGC 6791 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 The Age, Extinction and Distance of the Old Metal-Rich Open Cluster NGC 6791, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Age, Extinction and Distance of the Old Metal-Rich Open Cluster NGC 6791 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-995454