Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26as...52..105a&link_type=abstract
Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 52, April 1983, p. 105-113.
Astronomy and Astrophysics
Astrophysics
9
Astronomical Photometry, Globular Clusters, Hertzsprung-Russell Diagram, Astronomical Photography, Color-Magnitude Diagram, Electrophotometry, Horizontal Branch Stars, Interstellar Extinction, Stellar Color, Stellar Magnitude, Tables (Data)
Scientific paper
A color magnitude diagram (CMD) for the globular cluster NGC 6544 has been obtained from 164 stars measured photographically. Due to the large amount and the patchiness of the absorption at the low galactic latitude of b = -2°.2 where this cluster lies, as well as the difficulty in discriminating membership, both the giant branch of medium steepness and the group of only blue horizontal branch stars, are very scattered. The CMD suggests the {medium metallicity} traits, as expected from the integrated spectral type and colors of NGC 6544. The adopted horizontal branch position at VHB ≡ 15 and the deduced reddening of E(B-V) = 0.70, places the object at 2.9 kpc from the sun, 0.1 kpc from the galactic plane and 6.1 kpc from the galactic center. The location of most of the very reddened stars in the NW region, suggests the presence of differential reddening in the face of the cluster.
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