Photometry of RR Lyrae variables in the globular clusters M5 and M92
- Creators
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Cohen, J. G.
- Matthews, K.
Abstract
Visual photometry at V and i has been obtained for five RR Lyrae variables in the extremely metal-poor globular cluster M92 and eight in the cluster M5, of intermediate metallicity, for use in a Baade-Wesselink analysis. The periods of these variables have been updated by combining observations of the current epoch with older data from the literature. Mean magnitudes are derived from the light curves. Infrared photometry at J and has also been obtained for two RR Lyrae variables in M92 and for four variables in the cluster M5. The data were obtained with a 58 x 62 pixel InSb array. The reduction and analysis techniques are discussed. Preliminary distance determinations using the〈M_v〉 —[Fe/H] relationship from the literature were derived as (m—M)_0 = 14.48 ± 0.04 for M92 and 14.25 ± 0.05 for M5, while preliminary distance determinations using the〈M_K〉— log(P) relationship were derived as 0.15 mag smaller.
Additional Information
© Astronomical Society of the Pacific · Provided by the NASA Astrophysics Data System. Received 1992 March 10; accepted 1992 August 25. J. G. C. is grateful to Gaston Araya Machining and to the Caltech Recycling Center for financial support. K. M. is supported by NSF Grant No. AST-8920897. We are grateful to D. Carico for help with the observing on several nights. Ben Holland helped with the observing at the 60-in. telescopeAttached Files
Published - 1992PASP__104_1205C.pdf
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Additional details
- Eprint ID
- 96082
- Resolver ID
- CaltechAUTHORS:20190603-153224615
- Caltech Recycling Center
- AST-8920897
- NSF
- Created
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2019-06-04Created from EPrint's datestamp field
- Updated
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2021-11-16Created from EPrint's last_modified field