A New Atlas of theDiffuse Interstellar Bands: HD 183143
Lewis M. Hobbs
Yerkes, U. ChicagoDonald G. York
U. ChicagoJulie A. Thorburn Dahlstrom
Carthage CollegeTheodore P. Snow
U. ColoradoMichael Bishof
U. ChicagoScott D. Friedman
STScIBenjamin J. McCall
U. IllinoisTakeshi Oka
U. ChicagoBrian Rachford
Embry-RiddlePaule Sonnentrucker
STScIDaniel E. Welty
U. Illinois
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 “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)
Credit: robgendlerastropics.comHD 204827
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
Our Website: http://dibdata.org
http://dibdata.org
