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

2. B. J. McCall, in preparation
Discovery of the DIBs
5780, 5797 seen as unidentified bands
 Per,  Leo (Mary Lea Heger, Lick, 1919)
Broad (“diffuse”)
“Stationary” (interstellar)
B. J. McCall, in preparation

3. A Growing Problem Tuairisg et al. 2000 Jenniskens & Desert 1994
This work
Jenniskens & Desert 1994
Merrill & Wilson 1938
Merrill & Wilson 1960
Herbig 1988
Herbig 1975
Herbig 1966
Heger 1919

4. 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 (115 reddened)
Measurements & analysis still underway

5. Echelle Image Fraunhofer Lines H: Ca II ~ 3968 Å K: Ca II ~ 3934 Å K H
D: Na I ~ 5890 Å
A: O2 ~ 7650 Å K H D A

6. Stellar Spectra HD 50064 EB-V = 0.84 Cyg OB2 #12 EB-V = 3.2 C F B D AKH A
Cyg OB2 #12
EB-V = 3.2

7. Previous Columbus Talks
1999 – RF09
2001 – WH02
2002 – TD08
2002 – TD09
2003 – RA02
2003 – RA03
2003 – RA04
2003 – RA05
2004 – RI06
2005 – RF02
2005 – RF03
2006 – FC12
2008 – WK01

8. Cepheus and IC 1396 ι δ π ζ β α η IC 1396 HD 204827
Credit: allthesky.com

9. IC 1396 and HD HD
Credit: robgendlerastropics.com

10. Adamkovics, Blake, & McCall,
About HD
EB-V=1.11, V=7.94, Spectral Type B0V
Strongest “C2 DIBs”
C3 champion!
Adamkovics, Blake, & McCall,
ApJ 595, 235 (2003)
Thorburn et al, ApJ 584, 339 (2003)

11. Unusual Stellar Lines standard star HD 204827 Night 5 Night 4 Night 3

12. Double-lined Spectroscopic Binary!
[Credit: R. Pogge, OSU]

13. Great Test for DIBs Enables unambiguous identification of DIBs
DIB count: 267 confirmed, 113 new, 380 total!

14. Previous Binary Work P. W. Merrill, ApJ 83, 126 (1936)
P. W. Merrill, PASP 483, 179 (1936)

15. Distribution by Width, Wavelength
Central
Wavelength
Full-Width at
Half-Maximum

16. Distribution of Strengths
Equivalent Width
(integrated area)

17. Distribution of Spacings
All Pairs of DIBs
Adjacent Pairs of DIBs

18. Catalog Now Available

20. Interactive Plots at dibdata.org

21. Acknowledgments Lew Hobbs Don York Ted Snow Takeshi Oka
Julie Thorburn, Michael Bishof, Scott Friedman,
Brian Rachford, Paule Sonnentrucker, Dan Welty
[T. Snow]
[T. Oka]
[B. J. McCall]