On the giant, horizontal and asymptotic branches of Galactic globular clusters. IV - CCD photometry of NGC 1904

Details On the giant, horizontal and asymptotic branches of Galactic globular clusters. IV - CCD photometry of NGC 1904 On the giant, horizontal and asymptotic branches of Galactic globular clusters. IV - CCD photometry of NGC 1904

Jun 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.256..391f&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 256, no. 3, June 1, 1992, p. 391-403.

Astronomy and Astrophysics

Astronomy

62

Asymptotic Giant Branch Stars, Globular Clusters, Hertzsprung-Russell Diagram, Horizontal Branch Stars, Metallic Stars, Astronomical Photometry, Charge Coupled Devices

Scientific paper

Attention is given to a new color-magnitude diagram for the evolved stars in the Galactic globular cluster NGC 1904 (M79); 3188 objects were measured on B, V CCD frames covering most of the cluster. The mean metallicity derived from CMD indices calibrated with the Zinn and West scale is 1.60 +/- 0.20, and the very small intrinsic widths of the various branches yield very low upper limits for any chemical abundance spread. The 'RGB bump' is well detected at V of 16.00 +/- 0/05, as a clumping of stars in the luminosity function of the RGB. Besides a small group of objects which populate a region typical for blue stragglers, there is some 'indirect' evidence for the possible existence of either a wider BS population or very blue horizontal branch objects in the central regions of the cluster. VHB = 16.15 +/- 0.10, and the HB has a very long blue tail that extends down to a magnitude fainter than the turn-off.

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