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Calibration of RR Lyrae Stars Using BVIK Light Curves for Improved Observation Accuracy

This project aims to calibrate MB, V, I, and K photometric measurements for RR Lyrae stars by obtaining BVIK light curves from field and cluster RR Lyrae stars. We plan to complete observations of 60 field RR Lyrae stars located in the A-List with a focus on securing K measurements for 16 stars, primarily in the Southern Hemisphere. The campaign involves multiple visits to globular clusters and has already made progress with several targets. Data analysis is set to begin in Summer 2004 to enhance our understanding of these variable stars.

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Calibration of RR Lyrae Stars Using BVIK Light Curves for Improved Observation Accuracy

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  1. RR Lyrae Observations MB,V,I,K = mB,V,I,K - 5 log d + 5 To calibrate MB,V,I,K we need: • BVIK light curves for field RRL • • BVIK light curves for cluster RRL •

  2. BVIK light curves of field RRL • 60 field RRL in A-List • BVI: • Most have PE/CCD B,V light curves. • Have been obtaining I with BGSU 0.5m+CCD • Plan to complete all stars w/ d > -20° by Sep 2004. • K: • 16 stars need K, most in South. • Propose queue-scheduled 2MASS at CTIO?

  3. BGSU 0.5m+CCD RRL

  4. Locations of Field RRL

  5. BVIK LCs of cluster RRL • BVI: • Six of the 13 RRL-bearing globulars have BVI. • Four need BVI: M13, M30, NGC362, NGC6723. • w Cen needs BI. • M55 and 47 Tuc need I. • Obtained with CTIO 0.9m and LCO 40”. • Propose continuation with 2MASS at CTIO? • K: • Will need to do most of the clusters, ~15 visits each. • Begin in 2004/5? SOAR, LCO 100”, MDM 2.4m?

  6. BVI data on RRL in globulars • w Cen: 66 visits in BI … done! • NGC 362: 25 visits in BVI … done? • 47 Tuc: 20 visits in I … done? • NGC 6732: 7 visits in BVI … needs more. • Will analyze images in Summer 2004.

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