A New Atlas of the Diffuse Interstellar Bands

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A New Atlas of the Diffuse Interstellar Bands: HD 183143 Lewis M. Hobbs Donald

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

The APO DIB Survey • • • Apache Point Observatory 3. 5 -meter 3,

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

Our Previous Atlas: HD 204827 • • EB-V=1. 11, V=7. 94 Strongest “C 2

Our Previous Atlas: HD 204827 • • EB-V=1. 11, V=7. 94 Strongest “C 2 DIBs” Highest column density of C 3 Double-lined spectroscopic binary! – Spectral Types O 9. 5 V & B 0. 5 III • 380 DIBs unambiguously detected • Ap. J 680, 1256 (2008) Credit: robgendlerastropics. com HD 204827

Our Newest Atlas: HD 183143 • EB-V= 1. 27, V=6. 92, B 7 Iae

Our Newest Atlas: HD 183143 • EB-V= 1. 27, V=6. 92, B 7 Iae – [Unfortunately, not a binary!] • Well studied by Herbig, others • No detectable C 2 or C 3 – Distinct chemical environment • 414 DIBs detected (135 are “new”) • DIB population systematically redder, broader, and stronger than HD 204827 • Total DIB count now ~545

Our Website: http: //dibdata. org

Our Website: http: //dibdata. org

http: //dibdata. org

http: //dibdata. org