VI Photometry of the Post-Core-Collapse Globular Cluster NGC 6558 and the Adjacent Bulge Field Population

Details VI Photometry of the Post-Core-Collapse Globular Cluster NGC 6558 and the Adjacent Bulge Field Population VI Photometry of the Post-Core-Collapse Globular Cluster NGC 6558 and the Adjacent Bulge Field Population

Sep 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aj....116.1295r&link_type=abstract

The Astronomical Journal, Volume 116, Issue 3, pp. 1295-1300.

Astronomy and Astrophysics

Astronomy

23

Galaxy: Globular Clusters: Individual: Ngc Number: Ngc 6558

Scientific paper

We present VI color-magnitude diagrams (CMDs) of the globular cluster NGC 6558 and its surrounding field, obtaining cluster parameters. The cluster has a blue extended horizontal branch and a depleted red giant branch, characteristics already observed in other post-core-collapse clusters in the bulge, such as NGC 6522, NGC 6540, and HP 1. These clusters do not belong to the metal-rich stellar population, and they may define a distinct class in the bulge. We derive a reddening of E(B - V) = 0.50 and a distance d_&sun; ~ 6.3 kpc. The CMD morphology is consistent with a metallicity range of -1.6 < [Fe/H] < -1.2. We also report photometry of the bulge field population (b = -6 deg on the minor axis) in which NGC 6558 is imbedded. As is the case for other bulge fields, there is a prominent red clump and a strong descending red giant branch, similar to that seen in lower latitude bulge fields; we estimate the metallicity of the bulge population to lie between that of 47 Tuc and the nearly solar-metallicity cluster NGC 6553 (i.e., approximately -0.3 dex). Based on observations collected at the European Southern Observatory, La Silla, Chile.

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