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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Does Collinder 236 host a Cepheid calibrator?
Monthly Notices of the Royal Astronomical Society, Volume 397, No. 2, Year 2009
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Description
Photoelectric UBV photometry and star counts are presented for the previously unstudied open cluster Collinder 236, supplemented by observations for stars near the Cepheid WZ Car. Collinder 236 is typical of groups associated with Cepheids, with an evolutionary age of (3.2 ± 1.1) × 10 7 yr, but it is 1944 ± 71 pc distant, only half the predicted distance to WZ Car. The cluster is reddened by E(B - V) ≃ 0.26, and has nuclear and coronal radii of rn ≃ 2 arcmin (1.1 pc) and R c ≃ 8 arcmin (4.5 pc), respectively. The Cepheid is not a member of Collinder 236 on the basis of location beyond the cluster tidal radius and implied distance, but its space reddening can be established as E(B - V) = 0.268 ± 0.006 s.e. from five adjacent stars. Period changes in WZ Car studied with the aid of archival data are revised. The period of WZ Car is increasing, its rate of +8.27 ± 0.19 s yr-1 being consistent with a third crossing of the instability strip. © 2009 RAS.
Authors & Co-Authors
Turner, David G.
Canada, Halifax
Saint Mary's University
Canada, Toronto
University of Toronto
United States, Cambridge
Harvard College
Forbes, D.
Canada, Corner Brook
Memorial University of Newfoundland, Grenfell Campus
Canada, Toronto
University of Toronto
Leonard, P. J.T.
United States, Bethesda
Adnet Systems, Inc.
Abdel-Sabour, M. A.
Egypt, Helwan
National Research Institute of Astronomy and Geophysics, Cairo
Majaess, D.
Canada, Halifax
Saint Mary's University
Berdnikov, Leonid N.
Russian Federation, Moscow
Lomonosov Moscow State University
United States, Cambridge
Harvard College
Statistics
Citations: 6
Authors: 6
Affiliations: 7
Identifiers
Doi:
10.1111/j.1365-2966.2009.15039.x
ISSN:
00358711
e-ISSN:
13652966
Research Areas
Cancer