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Title:
Leavitt variables - Bright variable supergiants and their implications for the distance scale
Authors:
Grieve, G. R.; Madore, B. F.; Welch, D. L.
Affiliation:
AA(British Columbia, University, Vancouver, Canada), AB(California Institute of Technology, Pasadena), AC(Toronto, University, Canada)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 294, July 15, 1985, p. 513-516. Research supported by the University of Toronto and NSERC. (ApJ Homepage)
Publication Date:
07/1985
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Cepheid Variables, Light Curve, Magellanic Clouds, Reference Stars, Stellar Magnitude, Supergiant Stars, Distance, H Lines, Infrared Photometry, Stellar Luminosity, Stellar Spectrophotometry
DOI:
10.1086/163318
Bibliographic Code:
1985ApJ...294..513G

Abstract

BVRI photometric observations of the LMC supergiants S65 - 08 and S65 - 48, obtained using the 61-cm reflector at the University of Toronto as part of an intermediate-supergiant monitoring program (Grieve, 1983), are reported and analyzed along with published data. The data are presented in tables and graphs, and both stars are found to have light variations (about 0.2 mag in V) with periods of about 250 d and H-band magnitudes consistent with positions on a linear extrapolation of the LMC Cepheid period/luminosity relation toward higher luminosity. It is suggested that detection of similar long-period low-amplitude variables in other galaxies would permit determination of accurate distances up to m-M = about 30 mag.

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