AuthorShuart, Ross Allen
AdvisorHumphreys, Roberta M.
MetadataShow full item record
PublisherThe University of Arizona.
RightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
AbstractPrevious work on the open cluster NGC 457 is discussed. The presence of a magnitude equation creates difficulty in using the published proper motions to determine membership of the brighter stars. Analysis of the available photometry reveals no systematic differences larger than 0.03 magnitude. The photometric distance modulus of the cluster is (m -M)₀ = 12.31 ± 0.25. The main sequence turnoff point, (B -V)ₜ = -0.24, indicates an age of 1.3 x 10⁷ years. MK classifications of previously unclassified cluster stars are used in a new evaluation of the spectroscopic distance, (m -M)₀ = 11.98 ± 0.39, which is brought into agreement with the photometric distance. Membership of the supergiant star 𝜙 Cas in the cluster seems likely, but cannot be proven. Some possible consequences of its membership are discussed.
Degree ProgramGraduate College