Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998mnras.293..434p&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 293, p. 434
Astronomy and Astrophysics
Astronomy
34
Color-Magnitude Diagram, Globular Clusters, Astronomical Photometry, Star Distribution, Charge Coupled Devices, Red Giant Stars, Horizontal Branch Stars
Scientific paper
We present a B-V CCD color-magnitude diagram (CMD) of the globular cluster M13 (NGC 6205), reaching down about 2 mag below the main sequence turn-off, based on a new independent photometric calibration. The most notable features of the CMD, including about 5500 stars, are (1) the long extension of the blue tail of the horizontal branch (HB), which can be traced down to V = 19 and shows the presence of two gaps; and (2) the so-called bump on the red giant branch which is well-detected at V = 14.75 +/- 0.05 using both the differential and integral luminosity functions. No similar features have ever been detected in any previous ground-based photometry of this cluster. A direct comparison between the CMD of M13 and M3, calibrated during the same run with the same apparatus, sets an upper limit of about 1.5 Gyr on their age difference, too small to explain the striking differences between their HB morphologies.
Carretta Eugenio
Ferraro Francesco R.
Fusi Pecci Flavio
Paltrinieri Barbara
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