NGC 6293 and NGC 6333 - Photometry of two clusters in the central bulge of the Galaxy

Journal Article · Sat Jun 01 04:00:00 EDT 1991 · Astronomical Journal; (United States)

DOI:https://doi.org/10.1086/115831· OSTI ID:5550366

Janes, K A; Heasley, J N ^[1]

---

1. Boston University, MA (USA) Hawaii, University, Honolulu (USA)

A preliminary investigation is conducted of two metal-poor globular clusters, NGC 6293 and NGC 6333, which are projected against the central bulge of the Galaxy. The observations consist of CCD B and V images obtained on three nights when the seeing was between 0.6 and 0.8 arcsec. The clusters' color-magnitude diagrams, which reach just to the main-sequence turnoff, show a morphology that confirms their metal-poor nature; both clusters have well-defined giant branches and blue horizontal branches, similar to those of M92. A comparison of NGC 6293 and NGC 6333 with the latter yields probable reddening values of about 0.47 and 0.44 mag, and apparent distance moduli of about 16.0 and 15.8, respectively, placing the two clusters roughly 1-2 kpc from the Galactic Center. The giant branch of NGC 6293 is deficient in bright red giants, its tip being a full magnitude fainter than that of NGC 6333. This may be the consequence of the cluster having undergone core collapse. 18 refs.

• OSTI ID: 5550366
• Journal Information: Astronomical Journal; (United States), Journal Name: Astronomical Journal; (United States) Vol. 101; ISSN 0004-6256; ISSN ANJOA
• Country of Publication: United States
• Language: English

Related Subjects

640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABUNDANCE
CHARGE-COUPLED DEVICES
COMPARATIVE EVALUATIONS
DISTANCE
ELEMENT ABUNDANCE
GALACTIC EVOLUTION
GALAXIES
GIANT STARS
GRAVITATIONAL COLLAPSE
IMAGES
MILKY WAY
MORPHOLOGY
POPULATIONS
RED GIANT STARS
SEMICONDUCTOR DEVICES
SPECTROPHOTOMETRY
STAR CLUSTERS
STAR EVOLUTION
STARS