RMxAA

Revista Mexicana de Astronomía y Astrofísica

ISSN: 3061-8649
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Keywords

Abundance
Astrometry
Astronomical Photometry
Charge Coupled Devices
Color-Magnitude Diagram
Globular Clusters
Group Velocity
Hubble Constant
Astrophysics
Globular Clusters: Photometry
Globular Clusters: Luminosity Function
Globular Clusters: Distances
Globular Clusters: Element Abundances

How to Cite

The NGC 1399 globular cluster system. (1989). Revista Mexicana De Astronomía Y Astrofísica, 19(1), 83-91. https://astronomia.unam.mx/journals/rmxaa/article/view/1989rmxaa..19...83g

Abstract

Integrated Washington photometry has been obtained for the globular cluster system of NGC 1399 with the CTIO 4-m prime focus CCD. The data extend to V ≡ 24.5. The derived luminosity function clearly shows a turnover at T1 = 23.0±0.15 or V = 23.45±0.16. Assuming the absolute magnitude of this peak is the same as for the Galactic globular cluster system yields a distance modulus of 30.95±0.22 for Fornax, or 0.7 mag closer than found for Virgo using the same method. A Hubble constant of 68±13 is derived assuming a canonical value for the Local Group Virgocentric infall velocity. Alternatively, solving for this infall velocity gives a value of 365 km s-1. Abundances are also derived.
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