BVI CCD photometry of the broad main-sequence globular cluster NGC 1851

Journal Article · Thu Mar 01 04:00:00 EST 1990 · Astronomical Journal; (USA)

DOI:https://doi.org/10.1086/115375· OSTI ID:6917732

Alcaino, G; Liller, W; Alvarado, F; Wenderoth, E ^[1]

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1. Ministerio de Educacion de Chile, Instituto Isaac Newton, Santiago (Chile)

Three-color CCD C-M diagrams are presented for the globular cluster NGC 1851, showing an extreme breadth of the main-sequence, similar to that of Omega Centauri. It is found that the main-sequence turnoff points are located at V(TO) = 19.44 + or - 0.10, with colors at B-V = 0.54 + or - 0.02, V-I = 0.61 + or - 0.02, and B-I = 1.15 + or - 0.03. The best fit to the VandenBerg and Bell (1985) isochrones is shown to be all C-M diagrams with Y = 0.20, Fe/H abundance ratio = -1.27, and (m-M)v = 15.45. It is concluded that NGC 1851 has a Delta V(TO - HB) = 3.34 + or - 0.10 and an age of 16 + or - 2 Gyr. 29 refs.

• OSTI ID: 6917732
• Journal Information: Astronomical Journal; (USA), Journal Name: Astronomical Journal; (USA) Vol. 99; 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
AGE ESTIMATION
CHARGE-COUPLED DEVICES
CHEMICAL COMPOSITION
GIANT STARS
INTERSTELLAR SPACE
MAIN SEQUENCE STARS
PHOTOMETRY
SEMICONDUCTOR DEVICES
SPACE
STAR CLUSTERS
STAR EVOLUTION
STARS