A New Catalog of Diffuse Interstellar Bands

1
A New Catalog ofDiffuse 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
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
This work
Jenniskens Desert 1994
Merrill Wilson 1960
Merrill Wilson 1938
Herbig 1988
Herbig 1975
Herbig 1966
Heger 1919
4
The APO DIB Survey

• Apache Point Observatory 3.5-meter
• 3,60010,200 Å ?/?? 37,500 (8 km/s)
• 119 nights, from Jan 1999 to Jan 2003
• S/N (_at_ 5780Å) gt 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 D Na I 5890 Å A O2 7650 Å
K
H
D
A
6
Stellar Spectra
C
HD 50064 EB-V 0.84
F
B
D
A
KH
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
?
d
p
?
IC 1396
ß
a
HD 204827
?
Credit allthesky.com
9
IC 1396 and HD 204827
HD 204827
Credit robgendlerastropics.com
10
About HD 204827

• EB-V1.11, V7.94, 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
Night 2
Night 1
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
19
http//dibdata.org
20
Interactive Plots at dibdata.org
21
Acknowledgments
Lew Hobbs
Don York
Takeshi Oka
Ted Snow
Julie Thorburn, Michael Bishof, Scott
Friedman, Brian Rachford, Paule Sonnentrucker,
Dan Welty
T. Snow
T. Oka
B. J. McCall