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A New Atlas of the Diffuse Interstellar Bands: HD 183143

A New Atlas of the Diffuse Interstellar Bands: HD 183143. Lewis M. Hobbs Yerkes, U. Chicago Donald G. York U. Chicago Julie A. Thorburn Dahlstrom Carthage College Theodore P. Snow U. Colorado Michael Bishof U. Chicago Scott D. Friedman STScI Benjamin J. McCall U. Illinois

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A New Atlas of the Diffuse Interstellar Bands: HD 183143

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  1. A New Atlas of the Diffuse Interstellar Bands: HD 183143 Lewis M. Hobbs Yerkes, U. Chicago Donald G. York U. Chicago Julie A. Thorburn Dahlstrom Carthage College Theodore P. Snow U. Colorado Michael Bishof U. Chicago Scott D. Friedman STScI Benjamin J. McCall U. Illinois Takeshi Oka U. Chicago Brian Rachford Embry-Riddle Paule Sonnentrucker STScI Daniel E. Welty U. Illinois

  2. The APO DIB Survey • Apache Point Observatory 3.5-meter • 3,600–10,200 Å ; / ~ 37,500 (8 km/s) • 119 nights, from Jan 1999 to Jan 2003 • S/N (@ 5780Å) > 500 for 160 stars (114 reddened) • Measurements & analysis still very much underway

  3. Our Previous Atlas: HD 204827 • EB-V=1.11, V=7.94 • Strongest “C2 DIBs” • Highest column density of C3 • Double-lined spectroscopic binary! • Spectral Types O9.5 V & B0.5 III • 380 DIBs unambiguously detected • ApJ 680, 1256 (2008) HD 204827 Credit: robgendlerastropics.com

  4. Our Newest Atlas: HD 183143 • EB-V= 1.27, V=6.92, B7Iae • [Unfortunately, not a binary!] • Well studied by Herbig, others • No detectable C2 or C3 • Distinct chemical environment • 414 DIBs detected (135 are “new”) • DIB population systematically redder, broader, and stronger than HD 204827 • Total DIB count now ~545

  5. Our Website: http://dibdata.org

  6. http://dibdata.org

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