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THE OPTICAL COMPANIONS OF THE LONG-PERIOD CEPHEID WZ SAGITTARII— REMAINS OF AN OPEN CLUSTER?
DAVID G. TURNER
Publications of the Astronomical Society of the Pacific
Vol. 96, No. 580 (June 1984), pp. 422-428
Published by: Astronomical Society of the Pacific
Stable URL: http://www.jstor.org/stable/40678340
Page Count: 7
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Photoelectric UBV photometry is presented for twelve 12th-to 15th-magnitude stars lying within 2 arc min of the 22d cepheid WZ Sgr. Eight of these stars are identified as probable B stars of similar reddening (⟨EB _ V(B0)⟩ = 0.56 ± 0.02), and it is argued from star counts and photometric distance estimates that seven of these objects belong to a newly-discovered, sparsely-populated, open cluster, 1.71 ± 0.06 kpc distant, centered only 3.6 arc min northwest of WZ Sgr. WZ Sgr is demonstrated to be an excellent candidate for membership in this sparse cluster based upon its similarity in reddening and age to cluster stars, and upon its inferred luminosity of ⟨Mv⟩ = — 4.88 ± 0.10 as a cluster member.
Publications of the Astronomical Society of the Pacific © 1984 The University of Chicago Press