The globular cluster NGC 6540

Details The globular cluster NGC 6540 The globular cluster NGC 6540

Mar 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...283...67b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 283, no. 1, p. 67-75

Astronomy and Astrophysics

Astrophysics

23

Galactic Nuclei, Galactic Structure, Globular Clusters, Stellar Spectrophotometry, Hertzsprung-Russell Diagram, Red Giant Stars, Ultraviolet Spectroscopy

Scientific paper

We have carried out UBVI and Gunn z CCD photometry and integrated spectroscopy in the range lambda 3700-10000 A of NGC 6540, which was previously classified as an open cluster. The observations indicate that we are dealing with a globular cluster of metallicity (Fe/H) approximately equal to -1.0 with an extended blue horizontal branch but some stars are also present on the red size. We derive a reddening of E(B-V) = 0.60 +/- 0.10 and a distance d = 3.5 kpc from the Sun. The cluster giant branch is very poorly populated like in some Palomar clusters; however it has a very concentrated nucleus. Bright giants, extended in the E-W direction, are outside the nucleus. Therefore the cluster has many characteristics in common with post core collapse clusters. A structural analysis by means of stellar isopleths reveals that the cluster is elongated in the N-S direction in the outer parts, whereas the inner contours are progressively twisted towards E-W.

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