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--------35th Liege International Astrophysics Colloquium The Galactic Halo :
from Globular Clusters to Field Stars July 5--8, 1999

President: Professor Icko Iben
University of Illinois, USA
Recent abundance analyses have shown puzzling results in subgiant
and giant stars in globular clusters as well as in field metal-poor
stars. High resolution spectrographs which are becoming available
on very large telescopes will greatly improve our knowledge of the
chemical composition of dwarfs and subgiants in some globular
clusters. The possibility of self-enrichment of globular clusters
is more than ever an open question which sheds new lights on their
formation and their primordial phases. Moreover, what do we know
and what can we learn about the conditions for their survival, the
possibility of evaporation of stars, the effects of crossing the
disk of our Galaxy... On the other hand, where do halo stars come from? Is there a link
between some of them and globular clusters? The abundance analyses
of chemical elements in metal-poor stars and in globular clusters
will give us clues as to the early environment and the early
evolution of these stars.The 35th Liege International Astrophysics Colloquium will address
these questions. It will take place from July 5 to July 8, 1999,
at the University's Observatory: Institut d'Astrophysique et de Geophysique
5, avenue de Cointe
B-4000 LIEGE
BELGIQUE Phone : (32 4) 254 75 16
Fax : (32 4) 254 75 11SCIENTIFIC SESSIONSEach session will start with review talks (approx. 45 min each,
see below). The reviews will be followed by contributed talks of
about 20 min each, including discussion.
Posters will be on display during the whole meeting and time will be
reserved each day to allow discussions with the poster authors.
We ask the participants to indicate their preference (talk/poster)
but, as we have a limited amount of time for contributed talks, the
organizing committee reserves the right to make the final choice.The abstracts (maximum length half an A4 page) will be reproduced in
a booklet made available to each participant upon arrival in Liege.
To be included in this booklet, we ask the authors to send, before
April 30, the following information: - Title
- Authors
- Desired Section
- AbstractPROCEEDINGSThe proceedings will be published very rapidly after the meeting.
They will contain the review papers, the contributed talks and the
posters. Typing instructions will be given in the third circular.SECOND CIRCULARFurther information, including a list of hotels and rates, practical
information and a map will be distributed in March to those of you
who have announced their participation.WWW INFORMATIONAll information about this colloquium including the registration form is
available at the following address:http://www.astro.ulg.ac.be/colloques/1999/colloque35.htmlThis page will frequently be updated.REGISTRATION FEEThe registration fee will be of 8000 belgian francs (approximately
230 US$) and will include lunches, tea, coffee, soft drinks at breaks,
local transportation, reception(s), and one copy of the proceedings.REGISTRATION DEADLINE: April 30, 1999SCIENTIFIC ORGANIZING COMMITTEE:I. Iben (president), M. Arnould, E. Jehin, P. Magain, A. Noels,
G. Parmentier, J.-P. Swings, A. ThoulLOCAL ORGANIZING COMMITTEE:P. Magain and A. Noels (chairpersons), D. Caro (secretary),
E. Jehin, G. Parmentier, J.-P. Swings, A. Thoul
We hope to hear from you soon and to see you in Liege next July.
For the Local Organizing Committee, Pierre Magain and Arlette Noels
If you have a colleague who may be interested, please make sure
to give her/him a copy of this announcement.SCIENTIFIC PROGRAMME / REVIEW TALKS
Section I. Early Galactic NucleosynthesisThis section will cover the nucleosynthesis in massive stars
during their evolution up to the supernova phase including the
elements ejected through stellar winds in the Wolf-Rayet phase.
This will be followed by a review on the theoretical results for
the supernova yields and a discussion of the uncertainties
affecting these yields. The evolution and the nucleosynthesis
in intermediate mass stars will then be discussed as well as those
stars' contribution to the chemical enrichment of the ISM. 1. Nucleosynthesis in massive stars
A. Maeder, Geneva

2. Supernova yields
D. Arnett, to be confirmed

3. Nucleosynthesis in AGB stars
S. Goriely, Brussels
Section II. Chemical Composition of Metal-Poor StarsAbundance analysis results will be reviewed, covering very
metal-poor and mildly metal-poor field stars as well as globular
cluster stars. The emphasis will be on the main differences and
the common features. 1. Light element abundances in very metal-poor stars
R. Gratton, Padova 2. Heavy element abundances in very metal-poor stars
S. Ryan, Cambridge 3. Mildly metal-poor stars
P.E. Nissen, Aarhus 4. Globular clusters
C. Sneden, Austin
Section III. Metal-Poor Components of our GalaxyThis section will cover what can be said as to the kinematics
of metal-poor stars and globular clusters. Formation scenarios of
the thick disk and the halo will be discussed. 1. Kinematics of thick disk and halo stars
B.W. Carney, North Carolina 2. Formation scenarios
R. Wyse, John Hopkins
Section IV. Chemical and Dynamical Evolution of
Globular ClustersEarly stages of globular clusters will be presented with an
emphasis on the possibility of self-enrichment. It will be
followed by a discussion on the dynamical evolution of globular
clusters with special attention given to the conditions of
disruption and to the evaporation of stars from a stable cluster. 1. Early stages of globular clusters
A. Burkert, Heidelberg 2. Dynamical evolution
G. Meylan, ESO
Section V. HR Diagrams of Globular ClustersThis section will be a confrontation between observed
colour-magnitude diagrams and theoretical HR diagrams of globular
clusters. Special emphasis will be on the uncertainties affecting
both the observational location of a star in a colour-magnitude
diagram and on the theoretical uncertainties in the modelling of
low mass stars used in the computation of theoretical isochrones.
Ages of globular clusters will also be addressed. 1. Photometry of globular cluster stars - CMDs
P. Stetson, Victoria 2. HR diagrams : theorist views
F. D'Antona, Roma 3. Ages of globular clusters
B. Chaboyer, Hanover
Section VI. Non-Standard ViewsA great freedom will be offered in this section to present
alternative or new views regarding the subjects discussed in the
preceding sections.