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Metal abundances of RR Lyrae stars in galactic globular clustersResults are reported for image-tube scanner measurements of Preston's (1959) metal-abundance indicator and metallic-line absorption in the G-band region (4285 to 4317 A) of 47 RR Lyrae stars in 12 galactic globular clusters and 67 RR Lyrae field stars. The relationship (Fe/H) is defined and determined from curve-of-growth analyses of 13 RR Lyrae field stars, while a comparison of metal-abundance vs metallic-line absorption relationships derived for the field and cluster stars indicates that both groups can be calibrated in the same way. Based on this calibration, (Fe/H) values are deduced for the globular-cluster stars and the clusters themselves. It is found that the alpha-rich phenomenon is present in these stars and is confined to calcium and titanium.
Document ID
19750059535
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Butler, D.
(Lick Observatory Santa Cruz, Calif., United States)
Date Acquired
August 8, 2013
Publication Date
August 15, 1975
Publication Information
Publication: Astrophysical Journal
Volume: 200
Subject Category
Astrophysics
Accession Number
75A43607
Funding Number(s)
CONTRACT_GRANT: NSF MPS-74-13717
CONTRACT_GRANT: NGL-05-061-033
CONTRACT_GRANT: NSF GU-3162
Distribution Limits
Public
Copyright
Other

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