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Baade-Wesselink radii for NGC 1866 CepheidsRadial velocities and CCD photometry suitable for a Baade-Wesselink analysis are now available for six short-period Cepheids (HV12198, HV12199, HV12202, HV12203, HV12204, and V4) in the LMC cluster NGC 1866. As a prerequisite for such an analysis, O-C diagrams have been constructed and examined for seven of the NGC 1866 Cepheids (HV12197, HV12198, HV12199, HV12200, HV12202, HV12203, and HV12204), yielding improved periods and estimates of the rate of period change in these coeval variables. One star, HV12198, shows possible evidence for period change, but the phase mismatch due to that change is small enough to have negligible effect on its Baade-Wesselink radius. The computed radii are in good agreement with the Baade-Wesselink, theoretical and cluster/association period-radius relations of Fernie (1984) and the Galactic relation of Coulson and Caldwell (1989). The Flower (1977) color-effective temperature relation and the Becker et al. (1977) mass-luminosity relation lead to mean masses of 4.9 + or - 0.5 solar masses and 4.6 + or - 0.5 solar masses for the respective metallicities of (Y,Z) = (0.0273,0.0016) and (0.026,0.02). Pulsation constants are also computed for these stars.
Document ID
19910050262
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Cote, Patrick
(McMaster Univ. Hamilton Ontario, Canada)
Welch, Douglas L.
(McMaster Univ. Hamilton Ontario, Canada)
Fischer, Philippe
(McMaster University Hamilton, Canada)
Mateo, Mario
(Observatories of the Carnegie Institution of Washington Pasadena, CA, United States)
Madore, Barry F.
(JPL Pasadena, CA, United States)
Date Acquired
August 15, 2013
Publication Date
May 1, 1991
Publication Information
Publication: Astronomical Journal
Volume: 101
ISSN: 0004-6256
Subject Category
Astrophysics
Accession Number
91A34885
Funding Number(s)
CONTRACT_GRANT: NAS5-26555
Distribution Limits
Public
Copyright
Other

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