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Photometry of RR Lyrae variables in the globular clusters M5 and M92

Cohen, J. G. and Matthews, K. (1992) Photometry of RR Lyrae variables in the globular clusters M5 and M92. Publications of the Astronomical Society of the Pacific, 104 (682). pp. 1205-1215. ISSN 0004-6280. doi:10.1086/133109.

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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.

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Cohen, J. G.0000-0002-8039-4673
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. telescope
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Caltech Recycling CenterUNSPECIFIED
Issue or Number:682
Record Number:CaltechAUTHORS:20190603-153224615
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Official Citation:J. G. Cohen and K. Matthews 1992 PASP 104 1205
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:96082
Deposited By: George Porter
Deposited On:04 Jun 2019 21:06
Last Modified:16 Nov 2021 17:17

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