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Diffuse Interstellar Bands: HD

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Presentation on theme: "Diffuse Interstellar Bands: HD"— Presentation transcript:

1 Diffuse Interstellar Bands: HD 183143
A New Atlas of the Diffuse Interstellar Bands: HD 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 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 Total DIB count now ~545

5 Our Website: http://dibdata.org

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