CCD photometry of M 80 and the ranking of the C-M diagrams of galactic globulars

Details CCD photometry of M 80 and the ranking of the C-M diagrams of galactic globulars CCD photometry of M 80 and the ranking of the C-M diagrams of galactic globulars

Jul 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26a...335..929b&link_type=abstract

Astronomy and Astrophysics, v.335, p.929-942 (1998)

Astronomy and Astrophysics

Astrophysics

20

Globular Clusters: Individual: Ngc 6093, Stars: Evolution, Hertzsprung-Russell (Hr) Diagram, Stars: Population Ii, Stars: Horizontal-Branch

Scientific paper

We present deep B and V CCD photometry of the intermediate metallicity, high central density galactic globular cluster M 80. More than 10000 stars have been measured, reaching a limiting magnitude V =~ 23. The color magnitude diagram shows a population of very hot horizontal branch (HB) stars, stretching down to V magnitudes fainter than those of the turn off stars, to the limiting level of the present photometry. Using the giant branch as metallicity indicator, we derive [Fe/H]=-1.71+/-0.20. From the location of the HB, we obtain an apparent distance modulus (m-M)_V=15.58+/-0.12. The R ratio gives Y=0.25+/-0.05 and shows a radial trend, with the HB stars in the blue tail more concentrated than the red giant stars. We show also evidences that the hot HB stars are ``bona fide'' normal He burning stars. The color-magnitude diagram of M 80 has been compared with the corresponding diagrams of other clusters with similar metallicity (within +/-0.1 dex), and with different metallicity. Both comparisons reveal clear differences, which might be interpreted as uncertainties in color calibrations of the color-magnitude diagrams or might reflect differences in the ``global'' metallicity of the galactic globular clusters.

Affiliated with

Also associated with

No associations

Rating

CCD photometry of M 80 and the ranking of the C-M diagrams of galactic globulars 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 CCD photometry of M 80 and the ranking of the C-M diagrams of galactic globulars, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and CCD photometry of M 80 and the ranking of the C-M diagrams of galactic globulars will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1341036