Metal abundances of RR Lyrae stars in galactic globular clusters
Journal Article
·
· Astrophys. J., v. 200, no. 1, pp. 68-81
Results 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.
- Research Organization:
- Lick Observatory, Board of Studies in Astronomy and Astrophysics, University of California, Santa Cruz
- NSA Number:
- NSA-33-003772
- OSTI ID:
- 4179346
- Journal Information:
- Astrophys. J., v. 200, no. 1, pp. 68-81, Journal Name: Astrophys. J., v. 200, no. 1, pp. 68-81; ISSN ASJOA
- Country of Publication:
- United States
- Language:
- English
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