Drawing a coherent picture of the observational characteristics of the Diffuse Interstellar Bands (DIB's) and the physical and chemical properties of its proposed carriers was the focus of this NASA sponsored conference. Information relating to absoption spectra, diffuse radiation carriers, carbon compounds, stellar composition, and interstellar extinction involving T-Tauri stars, Reflection Nebulae, Red Giants, and accretion discs are discussed from those papers presented at the conference, which are included in this analytic

Tielens, Alexander G. G. M.

English

NASA Technical Reports Server

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NASA Conference Publication 10144
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TheDiffuseInterstellar
Bands:ContributedPapers
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Edited by
A. G. G. M. Tielens
Ames Research Center
Moffett Field, California
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Proceedings of a symposium held at
Boulder, Colorado
May 16-19, 1994
National Aeronautics and
Space Administration
Ames Research Center
Moffett Field, California 94035-1000
1994
https://ntrs.nasa.gov/search.jsp?R=19950009412 2020-06-16T09:12:41+00:00Z
CONTENT
_. "i _
PREFACE ............................................................................................................................
SCIENTIFIC ORGANIZING COMMITTEE ................................................................
SCHEDULE ........................................................................................................................
OBSERVATIONS OF DIFFUSE INTERSTELLAR BANDS
NEUTRAL GAS AND DIFFUSE INTERSTELLAR BANDS IN THE LMC ....................
A.C. Danks and B. Penprase
DIBS INDEPENDENT OF ACCRETION IN T TAURI STARS ......................................
L. Ghandour, P. Jenniskens, and P. Hartigan
DIFFUSE INTERSTELLAR BANDS IN REFLECTION NEBULAE ..............................
O. Fischer, Th. Henning, W. Pfau, and R. Stognienko
A SEARCH FOR THE 13175/_ INFRARED DIFFUSE BAND IN DENSE
ENVIRONMENTS ..............................................................................................................
A. J. Adamson, T. 1"1.Kerr, D. C. B. Whittet, and W. W. Duley
ON THE AFFINITIES OF _.5778 AND OTHER BROAD DIFFUSE
INTERSTELLAR BANDS ..................................................................................................
A. Mclntosh and A. Webster
THE PECULIAR BEHAVIOUR OF THE 5780 AND 5797 DIBS IN HD25137 ...............
L Porceddu and P. Benvenuti
DIFFUSE INTERSTELLAR BANDS BETWEEN 3900 AND 4200 A ..............................
R. E. Hibbins, J. R. Miles, P. J. Sarre, and G. H. Herbig
CORRELATION BETWEEN MOLECULAR LINES AND DIFFUSE
INTERSTELLAR BANDS ..................................................................................................
R. Szczerba, J. Krelowski, G. A. H. Walker, E. T. Kennelly, C. Sneden,
K. Volk, and G. Hill
DIFFUSE BANDS VERSUS EXTINCTION PARAMETERS ..........................................
W. Wegner, T.P. Snow, C. Sneden, and J. Krelowski
LABORATORY STUDIES OF PROPOSED CARRIERS
PORPHYRINS IN THE INTERSTELLAR MEDIUM (IN GRAINS) ................................
F. M. Johnson
Page
V
vii
ix
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LABORATORY SPECTRA OF C6O AND RELATED MOLECULAR
STRUCTURES .....................................................................................................................
J. Jan_a. M. Solc, and M. Vete_nik
INVESTIGATING THE 3.3 _m INFRARED FLUORESCENCE FROM
NAPHTHALENE FOLLOWING ULTRAVIOLET EXCITATION ...................................
R. M. Williams and S.R. Leone
INVESTIGATION OF A LABORATORY CANDIDATE FOR THE CARRIER OF
THE 4430/_, DIFFUSE INTERSTELLAR BAND ..............................................................
T. J. Wdowiak, L.W. Beegle, W. Lee, and M. S. Robinson
THEORETICAL STUDIES
FORMATION OF DUST GRAINS WITH IMPURITIES IN RED GIANT WINDS ........
C. Dominik
THE FORMATION OF SMALL GRAINS IN SHOCKS IN THE ISM ............................
A. P. Jones and A. G. G. M. Tielens
THE C4H RADICAL AND THE DIFFUSE INTERSTELLAR BANDS. AN
AB INITIO STUDY ..............................................................................................................
M. Kolbuszewski
QUANTUM CHEMISTRY AND EXCITED STATES: FIRST INVESTIGATIONS ON
PYRENE-LIKE MOLECULES ............................................................................................
O. Parisel and Y. EUinger
L(a)-INDUCED, TWO-PHOTON ABSORPTION OF VISIBLE LIGHT EMITTED
FROM AN O-TYPE STAR BY H_ IONS LOCATED NEAR THE SURFACE
OF THE STROMGREN SPHERE SURROUNDING THE STAR: A POSSIBLE
EXPLANATION FOR THE DIFFUSE INTERSTELLAR ABSORPTION
BANDS (DIBS) ...................................................................................................................
J. H. Glownia and P.P. Sorokin
A BIBLIOGRAPHY OF PAPERS ON THE DIFFUSE INTERSTELLAR BANDS ..........
T. P. Snow, S. Barnes, and M. Heitzmann
ADDRESSES OF PARTICIPANTS ....................................................................................
AUTHOR INDEX .................................................................................................................
SUBJECT INDEX ................................................................................................................
DIB INDEX ..........................................................................................................................
53-1t
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131
139
141
143
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PREFACE
On May 16 through 19 1994, a conference on The Diffuse Interstellar Bands was held at the Uni-
versity of Colorado, Boulder, Colorado. This conference was made possible by a generous grant
from the Astronomy and Relativity Branch of the National Aeronautics and Space Agency. We are
also particularly grateful to the support and services rendered by the dedicated staff at NASA Ames
Research Center and at the Center for Astrophysics and Space Astronomy without whom this con-
ference would not have been possible.
The discovery of visible diffuse absorption bands in stellar spectra dates back to the pioneering years
of stellar spectroscopy. The interstellar origin of four bands at _,5780, 5797, 6284, and 6614 was
already recognized by Paul Merrill in the thirties. Since this early work, the list of Diffuse Interstellar
Bands, or DIBs, has grown steadily over the years. These bands appear to be a widespread and a
general characteristic of the diffuse interstellar medium. Hence, its carrier(s) should be an ubiquitous
component of the interstellar medium. In spite of this, the agent(s) responsible remain unknown.
This is not for want of trying. Many carriers have been proposed over the years for these absorption
bands. Hitherto, none has withstood general scrutiny. However, this situation may now be changing
due to advances in optical techniques (i.e., the widespread availability of CCD arrays), in laboratory
studies of astrophysically relevant materials, and in our general understanding of the interstellar
medium.
The major goal of this conference was to draw a coherent picture of the observational characteristics
of the DIBs and the physical and chemical properties of its proposed carriers. Currently, partly
because of the rapid advances, no observational summary is available. Except for those directly
involved in the observations, many scientists have therefore ill-defined concepts of the observational
properties of the DIBs. Likewise, much experimental data on astrophysically relevant materials is
scattered throughout the literature but no overview from a DIB perspective is available. Hence, a
major aim of this meeting was to produce conference proceedings which reflect the current situation
regarding the DIBs. This book, containing the contributed papers presented at this meeting, repre-
sents the first installment. The invited papers will be published separately by Kluwer in the Astro-
physics and Space Science Library series.
This conference brought together 70 scientist from 10 different countries. The study of the DIBs is a
highly interdisciplinary field where astronomy, physics, and chemistry meet. This is reflected in the
varied background of the participants. Besides astronomers involved in observations and/or analysis
of the DIBs, chemists and physicistsmstudying proposed carriers spectroscopically--were active
participants. Hopefully, this encounter in Boulder will foster an ongoing, probing dialogue between
these scientists with diverse backgrounds but a common interest in the DIBs. In this way, fundamen-
tal progress can be expected to be made towards the solution of this problem.
By all accounts the conference was a great success. This was due in large measure to the high level
of dedication and commitment of the Local Organizing Committee. In particular, we are very grate-
ful to Ted Snow who smilingly accepted the organizing chores, well knowing the heavy load. I also
like to single out Janice Vamey of the Experimental Astrophysics Branch, NASA Ames Research
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Center, who took care of many of the secretarial duties involved in the organization of this confer-
ence. On behalf of all the participants, I thank them for their outstanding efforts.
A. G. G. M. Tielens
[Chairman SOC]
Moffett Field, California, June 1994
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SCIENTIFIC ORGANIZING COMMITTEE
H. J. Habing (The Netherlands)
J. Krelowski (Poland)
P. Martin (Canada)
W. B. Somerville (UK)
Th. Henning (Germany)
S. Leach (France)
T. Onaka (Japan)
T. P. Snow (U.S.)
A. G. G. M. Tielens (U.S.)
_, i_
vii
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8:30-8:45
8:45-9:15
9:15-10:15
10:15-10:45
10:45-11:15
11:15-11:45
1:30-2:00
2:00-2:30
2:30-3:00
3:00-3:30
3:30-4:10
4:10-4:40
SCHEDULE
Monday May 16 th
Morning
W.H. Smith
J. Krelowski
P. Sane
S. Fossey
J. Cardelli
B. Foing
Session 1
DIBs Observational Characteristics
Welcome
Historical and Interdisciplinary Perspectives
DIBs in individual sightlines
coffee break
Ultrahigh resolution spectroscopy of DIBs
DIBs towards southern stars
Afiemoon
P. Jenniskens A DIB survey
DIBs in the UV
DIBs in the IR
P. Martin
A. Adamson
coffee break
Interstellar Polarization
Specv'opolarimetry of DIBs in HD 197770
4:40-6:00 Poster session
ix
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8:30-9:30
9:30-10:00
10:00-10:30
10:30-11:00
11:00-11:30
11:30-12:00
1:30-2:00
2:00-2:30
2:30-3:00
3:00-3:30
3:30-4:00
4:00-4:30
4:30-6:00
B. Somerville
X. Desert
Ehrenfreund
W. Pfau
I. Porceddu
G. Seab
P. Sarre
A. Witt
C. Joblin
D. Rouan
Tuesday May 17 th
Morning
Session 2
Thg collective b_havi0r of DIBs
Collective behavior of the DIBs
DIBs and the UV extinction curve
coffee break
The environment dependence of DIBs
DIBs in the young galactic clusters M16 and M17
A DIBs and related data hypertextual atlas
Afternoon
DIBs and circumstellar shells
Red Rectangle emission bands
HAC and the ERE
coffee break
Visible luminescence from PAHs and Diffuse Bands
in emission
Carrier of the DIBs in the Red Rectangle: constraints on
molecular size
Poster session
• : ii
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8:30-9:30
9:30-10:00
10:00-10:30
10:30-11:00
11:00-11:30
11:30-12:00
1:30-2:00
2:00-2:30
2:30-3:00
3:00-4:00
4:00-4:30
4:30-5:00
Wednesday May 18 th
Morning
Session 3
Laboratory S_udies of Proposed Carriers
Allamandola
J. Maier
F. Salama
d'Hendecourt
B. Donn
P. Boissel
B. Rowe
J. Mathis
P. Shapiro
P. Martin
Laboratory studies of DIB carriers
Laboratory studies of unsaturated
hydrocarbons and the DIBs
coffee break
UV, visible and NIR absorption spectroscopy
of neutral and ionized PAHs
Towards the identification of the (single)
carrier of the 4430 and 7564,_ DIBs
A critical assesment of the PAIl hypothesis revisited
Afternoon
Photofragmentation of trapped ions towards
spectroscopy of truly isolated species
Experimental studies of naphthalene and
anthracene reactions
coffee break
Session 4
DIBs and Interstellar Dust
DIBs and Interstellar Dust
Grain carriers and DIB profiles
Polarization observations of the 2175/_ band
xi
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8:30-9:10
9:10-9:40
9:40-10:00
10:00-10:30
10:30-11:30
1:00-1:20
1:20-1:40
1:40-2:00
2:00-2:20
2:20-2:40
2:40-3:10
3:10-4:10
4:10-4:30
S. Leach
E. Herbst
E. Bakes
T. Snow
W. Duley
F. Johnson
A. Leger
P. Thaddeus
A. Webster
A. Tielens
Thursday May 19 th
Morning
Session _5
Theoretical Studies of MQl_ular _arricrs
Molecular carriers of the DIBs
large molecules in the ISM
Charge variations of PAils in the ISM
coffee break
Session 6
Proposed Carriers
Observational characteristics of the DIBs
Afternoon
DIB carriers on grain surfaces
Porphyrins and the DIBs
PAils and the DIBs
Carbon chains and the DIBs
Fullerenes and the DIBs
coffee break
Panel Discussion
Summary
xii
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OBSERVATIONS OF DIFFUSE INTERSTELLAR BANDS


The Diffuse Interstellar Bands: Contributed papers

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