Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...284..108o&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 284, Sept. 1, 1984, p. 108-117.
Astronomy and Astrophysics
Astrophysics
38
Abundance, Astronomical Photometry, Color-Magnitude Diagram, Globular Clusters, Magellanic Clouds, Stellar Color, Stellar Magnitude, Electrophotometry, Stellar Evolution, Ubv Spectra
Scientific paper
Photographic photometry has been carried out in the red LMC cluster NGC 1978 using the CTIO 4 meter telescope at prime focus, photographic plates, the Pickering-Racine prism, and a newly derived photoelectric sequence. The photographic plates were digitized using the KPNO PDS, and reduced using the KPNO RICHFLD program. Color-magnitude diagrams of the cluster and of four adjacent fields are given; statistical subtraction of the fields is needed to derive an age for NGC 1978. The age is 2 x 10 to the 9th yr, lower than that derived from studies of the integrated light of the cluster. The abundance of NGC 1978 is estimated to be - 0.5 solar Z, in agreement with recent spectroscopic work. Identifications of the RR Lyrae candidates mentioned in earlier studies of NGC 1978 are provided. None of these stars are likely to be associated with NGC 1978 itself.
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