AM-1 - A very distant globular cluster

Details AM-1 - A very distant globular cluster AM-1 - A very distant globular cluster

Jan 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...276..221a&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 276, Jan. 1, 1984, p. 221-228.

Other

36

Abundance, Globular Clusters, Stellar Spectrophotometry, Color-Magnitude Diagram, Halos, Hertzsprung-Russell Diagram, Horizontal Branch Stars, Stellar Color, Stellar Luminosity, Stellar Magnitude

Scientific paper

Deep B and V frames have been obtained for Arp-Madore 1 (AM-1) using the Cerro Tololo 4 m telescope and prime focus CCD camera, confirming the nature of this object as a globular cluster. In particular, the resulting color-magnitude diagram shows a sharply defined red horizontal branch at apparent magnitude m(V) = 20.93 + or - 0.04. Adopting M(V)(HB) = 0.6 then yields a galactocentric distance of 118 kpc, an amount placing AM-1 as the most distant globular cluster yet identified which may still be associated with the Galaxy. From the color of the giant branch at the horizontal branch, Fe/H is estimated as -1.8 + or - 0.3, a value which lends support to previous arguments that the abundance gradient in the outer halo is weak. In stellar content AM-1 appears similar to the other low-luminosity members of the outer halo - the Palomar clusters and dwarf spheroidals.

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