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[vsnet-conference 47] Fw: IAU COLLOQUIUM 191

This is the firt announcememnt for the IAU Colloquium 191. Please
re-send this message to those on your institution who may be interested.

Our apologize if you receive this message twice.

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                          FIRST ANNOUNCEMENT

                             IAU COLLOQUIUM 191

    THE ENVIRONMENTS AND EVOLUTION OF DOUBLE AND MULTIPLE STARS

                            Merida, Yucatan, Mexico

                               February 3 - 7, 2003


This Colloquium is sponsored by Commission 26 of the IAU, with support
from Commissions 30, 34, 37, and 42. It thus has support from
commissions
in five different Divisions, numbered IV, V, VI, VII and IX. It is
co-sponsored by Universidad Nacional Autonoma de Mexico, with support
from
Consejo Nacional de Ciencias y Tecnologia.

Venue:

The Colloquium will be held at the Universidad Nacional Autonoma de
Yucatan, in Merida, during the first week of February, 2003.

Scientific Goals:

The subject matter of IAU Colloquium 191 follows naturally from that of
IAU
Symposium 200, held in Potsdam in April 2000 on binary star formation.
Another of its forebears is Colloquium 33, on the observational
parameters
and dynamical evolution of multiple stars. That colloquium was held in
Mexico, and owed its existence in large measure to Arcadio Poveda. We
now
wish to honour Dr. Poveda's contributions to multiple star astronomy by
holding Colloquium 191 in Merida, his birthplace.

Binary formation is so active a field that sufficient advances have been
made
since Symposium 200 to warrant spending some time on new developments in

that area. But the main thrust of Colloquium 191 will be on the later
evolution of binary and multiple stars, and in particular on the role
played by their environment in that evolution. We wish to consider the
interaction between the evolution of binary stars and their
surroundings,
be they interstellar material, cluster stars, or simply other components

of a hierarchical multiple. In turn we wish to see what effect evolving
binary stars have on their environment.

We are concerned with the physical processes that characterize the
episodes of evolution that occur after binary stars have formed, and the

observations required to elucidate them. Many of those observations,
such as
binary frequencies in different environments, are statistical in nature.
The
distributions of orbital parameters, and correlations between them, seem
to
be dependent upon environment, both interstellar and cluster, as well as
upon
age and population type. Furthermore, the evidence for dynamical
interactions
within multiple systems has increased greatly since they were considered
at
Colloquium 33. We need to be able to interpret statistical distributions
in
terms of physical processes, such as the accretion, exchange and loss of

mass, angular momentum and energy.

Finally, Commission 26 is devising a new system of nomenclature for
components of stellar systems, which is becoming increasingly necessary
as a
result of recent discoveries of stellar and substellar components in
increasing numbers, and of the large number of new discoveries
anticipated
from future space missions. Growing numbers of planetary companions must

also fit into any new scheme. Colleagues at the U.S. Naval Observatory
are
developing the Washington system into one that will accommodate those
discoveries. The intention is that this should be in time to be able to
present a formal resolution in Sydney in 2003. It is thus most
appropriate
to have at least some informal discussion of the matter at Colloquium
191.

It is our intention to keep the number of invited talks to a minimum,
and to
provide as much time as possible to contributed talks and posters. A
preliminary program follows. Both the topics and the allotted time are
subject to adjustment depending on the numbers of papers submitted. Both
oral
and poster papers are welcome on all relevant topics.

Preliminary program:

Session 1 (1 day):
a) Review of present observational status of binary and multiple stars,
   including nomenclature.
b) Statistics of binary and multiple stars in different populations and
   environments.
c) Expected impact of future space astrometric and large ground-based
   telescopes on binary star work.

Session 2 (1 day):
a) Binary and multiple stars in clusters.
b) Orbital statistics in clusters of various ages.
c) Production of X-ray binaries and pulsars in globular clusters.
d) Collisional and non-collisional mergers of binary components.
e) Formation of hierarchical groups in small clusters.

Session 3 (1 day):
a) Evolution of young binary and multiple stars beyond the formation
stage.
b) Interaction with interstellar clouds and massive objects.
c) Encounters between double and multiple systems and spiral arms or
black
   holes.
d) Interaction between disks and stars.

Session 4 (1 day):
a) Dynamical evolution of hierarchical and non-hierarchical multiples by

   internal perturbations.
b) Angular momentum in binary and multiple systems.
c) Exchange between components and between orbital and rotational
motion.
d) Angular momentum loss and its role in the orbital evolution and
 coalescence of low-mass systems.

Session 5 (0.5 day):
a) Origin of runaway stars and early-type stars at high galactic
latitudes.
b) Wide binaries and triples from n-body interactions;
c) Planets and other low-mass components of multiple star systems.

Web Site:

The host institution has established a web site with the url:

http://www.astroscu.unam.mx/~uaic191/

Many details about the meeting can be found there, including the
following information:

1. Travel to Merida
2. Accommodation and car rentals
3. Tourism in and around Merida
4. Membership of the SOC and LOC
5. Social events and companions' program

An on-line registration form is also provided on the web site.

For more information on scientific matters please contact either of the
co-chairs of the SOC:

Colin Scarfe                                             Christine Allen

Department of Physics and Astronomy     Instituto de Astronomia
University of Victoria                               Universidad
Nacional Autonoma de Mexico
P.O. Box 3055, Victoria                           Apartado Postal 70-264

B.C. V8W 3P6                                          Ciudad
Universitaria
Canada                                                     Mexico D.F.
CP 04510
                                                                 Mexico

scarfe@uvic.ca                          chris@astroscu.unam.mx

For local matters please also contact Dr. Allen at the above address.

If you wish to receive the Second Announcement of the Colloquium, please

complete the form below and return it to the sender, or to either of the
co-chairs at the
email (or postal, if necessary) addresses given above.

I will attend IAU Colloquium 191.

        Certainly ______ Probably ______ Possibly ______

I would like to present either a poster ____ or oral ____ contributed
paper.

        Certainly ______ Probably ______ Possibly ______

Area from list of topics above into which your paper would fit best ____

(e.g. if it is in the area of "interactions between disks and stars"
insert
"3d" here)

Name: _______________________________________________

Postal address: _________________________________________________

                _________________________________________________

                _________________________________________________

email: _____________________________________

fax: _______________________________________

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