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Astrophysics > Solar and Stellar Astrophysics

arXiv:1310.0590 (astro-ph)
[Submitted on 2 Oct 2013]

Title:A New RR Lyrae Metallicity Calibration

Authors:E. Spalding, R. Wilhelm, N. De Lee
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Abstract:We have begun developing a new metallicity calibration for RR Lyrae stars that includes high-temperature phase regions. Our calibration is an updated and expanded version of the Delta-S, equivalent width method, but which is applicable for most phases of the pulsation, and for the hotter, shorter-period RRc stars. This calibration will be constructed from spectral observations of well studied, bright RR Lyrae stars with metallicities from published high-resolution studies, within the range $-2.5 < [Fe/H] < -0.3$. Phase information for our calibration stars were taken from the AAVSO website, and the MacAdam Student Observatory at the University of Kentucky. Low-resolution spectroscopy $(R \sim 1000)$ was obtained using the McDonald Observatory, 2.1 meter telescope. Here we present our preliminary data, and find the phase region where the calibration will break down.
Comments: Presented at the "40 Years of Variable Stars: A Celebration of Contributions by Horace A. Smith" conference (arXiv:1310.0149). 4 pages, 2 figures
Subjects: Solar and Stellar Astrophysics (astro-ph.SR)
Report number: Report-No:HASMITH/2013/20
Cite as: arXiv:1310.0590 [astro-ph.SR]
  (or arXiv:1310.0590v1 [astro-ph.SR] for this version)
  https://doi.org/10.48550/arXiv.1310.0590

Submission history

From: Charles Kuehn [view email]
[v1] Wed, 2 Oct 2013 06:50:31 UTC (339 KB)
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