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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.

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Spelling suggestions: "subject:"RR lyric surveys"" "subject:"RR lyrik surveys""

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RR LYRAE CALIBRATION USING SDSS, SINGLE-EPOCH SPECTROSCOPY

Long, Stacy 01 January 2018 (has links)
I use single-epoch, SDSS spectroscopy of RR Lyraes identified in the Catalina survey to separate the spectra into same-temperature groups. Then I draw temperature-phase diagrams of the groups. I find shocked stars, improperly phased stars, low amplitude stars, and a few that are more likely eclipsing binaries. The RR Lyraes are then given precise metallicities by measurements of the CaII K and H-β, H-γ, and H-δ lines. This leads to better distance measurements, which allow me to confirm a distinction between the inner and outer galactic halo.
stars
variables
RR Lyrae surveys
Sloan surveys
Catalina
metallicity calibration
galactic halo
Astrophysics and Astronomy
Physical Sciences and Mathematics

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