RR Lyrae Stars for SIM: Obtaining Apparent Mags

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RR Lyrae Stars for SIM Obtaining Apparent Mags

• I. Field RRL
• II. Cluster RRL
• Andy Layden -- 2005 July

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I. BVIK light curves of Field RRL

• (1) North (Dec gt -20)
• 2000-2005
• Obtaining differential VI with BGSU 0.5mCCD
• Completed most stars w/ 11h lt RA lt 24h (60
  stars)
• Dome motor repaired
• Mar05 calibrated more fields w/ WIYN 0.9m
• Secure 3 visits on 2 different nights
• 2006
• Continue BGSU observations
• 1 more VI WIYN 0.9m calibration run (May 2006)?
• Do 10-20 stars in BR.
• Start K-band photometry from MDM.

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BGSU 0.5mCCD
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I. BVIK light curves of Field RRL

• (2) South (Dec lt -10)
• 2004-5
• Obtained IK with SMARTS 1.3m AndiCam (queue)
• Completed 44 stars all w/ close comparison
  stars.
• Processing Photometry
• Worked out I calibration scheme tested
• Processed photometered 2004A K data.
• Working on 2004B K data.
• 2006
• Calibrate I data plot light curves in I K.
• Write paper
• mean mags color detection of companions

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SMARTS 1.3mAndiCam
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I. BVIK light curves of Field RRL

• (3) Literature
• Students typing in old UBV(I) data
• Sturch (1966)
• Fitch, Wisniewski, Johnson (1966)
• Students downloading other data
• Hipparcos/Tycho Catalog (BV)
• ASAS (I)
• Look for systematic offsets
• Combine to obtain better phase coverage

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Fitch etal (1966) vs. ASAS-3
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II. BVIK LCs of Cluster RRL

• (1) NGC 104
• Fe/H 0.76, 1 RRL (V9).
• (BV)I photom calibrated to Stetson (2000) stds
• RMS 0.02 mag.
• 2006
• Acquire more BVRI (CTIO 0.9m)?
• Publish paper
• Mean mags V(RR)
• Reddening from B-V and V-I color of RRL
• Color detection of companions

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II. BVIK LCs of Cluster RRL

• (2) NGC 362
• Fe/H 1.16, 7 known RRL.
• BVI photom calibrated to Stetson (2000) stds
• RMS 0.02 mag.
• 2006
• Acquire more BVRI (CTIO 0.9m)?
• Publish paper
• Mean mags V(RR)
• Reddening from B-V and V-I color of RRL
• Color detection of companions

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II. BVIK LCs of Cluster RRL

• (3) M30 (NGC 7099)
• Fe/H 2.12.
• gt3 known RRL.
• Have 34 BVRI visits on 10 nights ().
• (4) w Cen (NGC 5139)
• Fe/H 1.62, dispersion!
• Many known RRL.
• Have 20 BVI visits over many nights.

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Summary

• 2005
• VI photom of Northern field RRL
• IK photom of 40-50 Southern field RRL
• Literature UBVI data acquisition for field RRL
• BVI photom of RRL in NGC 104 NGC 362
• 2006
• Continue 1-4 above
• Publish paper on N104 N362
• Begin photom of RRL in M30 w Cen
• Apply for MDM time K photom of field RRL