Other
Scientific paper
Nov 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990aj....100.1532w&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 100, Nov. 1990, p. 1532-1560, 1756.
Other
58
Astronomical Photometry, Blue Stars, Color-Magnitude Diagram, Giant Stars, Globular Clusters, Light Curve, Fourier Analysis, Least Squares Method, Magellanic Clouds, Main Sequence Stars, Red Shift, Star Distribution
Scientific paper
B and V CCD photometry of the outlying LMC cluster NGC 1841 has revealed ten new RR Lyrae variables, making a total of 22. The mean period of the 17 RRab stars is 0.676 days; this and other evidence suggest that the metal abundance is very low, Fe/H = -2.2 + or - 0.2. The mean brightness of the variables is V = 19.31 + or - 0.02 (s.e.) and the cluster reddening is E(B - V) = 0.18 + or - 0.02. If the RR Lyraes are assumed to have M(v) = 0.5, then NGC 1841 has a distance modulus of 18.19 mag, and is thus some 0.3 mag closer to the earth than the LMC center. A deep color-magnitude diagram is presented which reaches the main-sequence turnoff at V = 22.6 + or - 0.2, confirming that NGC 1841 is as old as galactic globular clusters such as M92.
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