Radial distribution of blue stragglers and surface brightness profile in the post-core-collapse globular cluster NGC 6397

Details Radial distribution of blue stragglers and surface brightness profile in the post-core-collapse globular cluster NGC 6397 Radial distribution of blue stragglers and surface brightness profile in the post-core-collapse globular cluster NGC 6397

Aug 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...262...63l&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 262, no. 1, p. 63-72.

Astronomy and Astrophysics

Astrophysics

52

Brightness Distribution, Globular Clusters, Stellar Cores, Stellar Motions, Astronomical Photometry, Charge Coupled Devices

Scientific paper

The study presents surface and stellar CCD photometry in the central region of the nearby postcore-collapse globular cluster NGC 6397. U, B, V images obtained from the ESO at La Silla with the 1.5-m Danish telescope and B, V images taken under subarcsec seeing with the ESO New Technology Telescope were used. Two color-magnitude diagrams and a two-color one are presented. The blue straggler stars (BSs) reported by Auriere et al. (1990) are confirmed, and their list is expanded up to 18 stars for which positions, magnitudes, and color indices are given. The central blueing is due to a depletion of red giant stars for r greater than 7 arcsec and to a central group of six BSs in the inner zone. The surface brightness profile is consistent with postcollapse models of globular clusters, with a flat core of size 0.07 pc (6 arcsec on the sky) surrounded by a cusp of characteristic slope -0.72 +/- 0.02. The mean mass of BS and subgiant stars are in the ratio q = 1.49 +/- 0.35.

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