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The idea of this colloquium was first put forward by Prof. P.
Keenan when he visited the Centre de Donnees Stellaires, in
September 1982. Dr. A. Florsch, Director of the Strasbourg
Observatory, kindly accepted to field it at Strasbourg. The
scientific organization of the colloquium was in charge of a
Committee chaired by Prof. P.C. Keenan and composed by M. Feast, A.
Florsch, B. Gustafsson, D. Harmer, M. Jaschek (secretary), R.
McClure, A. Maeder, W. Straizys and T. Tsuji. The members of the
Committee helped to translate the idea into a very successful
meeting. It should be added that this colloquium was the first
meeting devoted to late-type peculiar stars. The program was
organized by sessions devoted to the following topics : taxonomy,
photometric properties, distribution and space motions, chemical
com- position, model atmosphere, binary systems and evolutionary
tracks. Each session started with a review paper, followed by
contributed papers presented as posters. The different sessions
were chaired by W. Bidelman, R. Cayrel, Ch. Cowley, A. Heck, H.R.
Johnson, J.P. Kaufmann and T. Tsuji, who did an excellent job. The
President of the "Louis Pasteur University of Strasbourg", Prof. H.
Duranton, welcomed the participants to the University where the
sessions were held; Dr. A. Florsch welcomed the participation on
be.balf of the French astrono- mical community and Prof. P. Keenan
spoke on behalf on the Scientific Organizing Committee.
The idea of this colloquium was first put forward by Prof. P.
Keenan when he visited the Centre de Donnees Stellaires, in
September 1982. Dr. A. Florsch, Director of the Strasbourg
Observatory, kindly accepted to field it at Strasbourg. The
scientific organization of the colloquium was in charge of a
Committee chaired by Prof. P.C. Keenan and composed by M. Feast, A.
Florsch, B. Gustafsson, D. Harmer, M. Jaschek (secretary), R.
McClure, A. Maeder, W. Straizys and T. Tsuji. The members of the
Committee helped to translate the idea into a very successful
meeting. It should be added that this colloquium was the first
meeting devoted to late-type peculiar stars. The program was
organized by sessions devoted to the following topics : taxonomy,
photometric properties, distribution and space motions, chemical
com- position, model atmosphere, binary systems and evolutionary
tracks. Each session started with a review paper, followed by
contributed papers presented as posters. The different sessions
were chaired by W. Bidelman, R. Cayrel, Ch. Cowley, A. Heck, H.R.
Johnson, J.P. Kaufmann and T. Tsuji, who did an excellent job. The
President of the "Louis Pasteur University of Strasbourg", Prof. H.
Duranton, welcomed the participants to the University where the
sessions were held; Dr. A. Florsch welcomed the participation on
be.balf of the French astrono- mical community and Prof. P. Keenan
spoke on behalf on the Scientific Organizing Committee.
The general discussions of the roles of photometric and
spectroscopic classification at Cordoba in 1971 (lAU Symposium No.
50), and of the calibration of classification indices at Geneva in
1972 (IAU Symposium No. 54), revealed clearly the steadily in
creasing importance of abundance parameters. The multipliCity of
these, however, raised so many new problems that it was logical
that the 1975 meeting at Lausanne should be concerned with ways in
which differences in abundance affect both spectral types and
photometric indices. Commissions 29 and 36 joined with Commission
45 in sponsoring this Symposium. Since the date of the meeting came
shortly after the formal retirement of Professor William W. Morgan
from the University of Chicago, it was quickly agreed that this
meeting should be dedicated to him in recognition of his unique
contributions to spectral classification. In the opening paper of
the Symposium Dr. Bengt Stromgren has summarized these. To his
remarks we should add only that it was about 1940 that Morgan first
distinguished the group of G- and K-type stars with weak CN bands
and metallic lines - stars which have since been recognized as
having the abundance of all metals relative to hydrogen much lower
than in stars of the solar population. Spectra of two of these, HD
81192 (Boss 2527) and 8 Lep, were later shown as examples of the
group in the Yerkes Atlas of 1943."
The general discussions of the roles of photometric and
spectroscopic classification at Cordoba in 1971 (lAU Symposium No.
50), and of the calibration of classification indices at Geneva in
1972 (IAU Symposium No. 54), revealed clearly the steadily in
creasing importance of abundance parameters. The multipliCity of
these, however, raised so many new problems that it was logical
that the 1975 meeting at Lausanne should be concerned with ways in
which differences in abundance affect both spectral types and
photometric indices. Commissions 29 and 36 joined with Commission
45 in sponsoring this Symposium. Since the date of the meeting came
shortly after the formal retirement of Professor William W. Morgan
from the University of Chicago, it was quickly agreed that this
meeting should be dedicated to him in recognition of his unique
contributions to spectral classification. In the opening paper of
the Symposium Dr. Bengt Stromgren has summarized these. To his
remarks we should add only that it was about 1940 that Morgan first
distinguished the group of G- and K-type stars with weak CN bands
and metallic lines - stars which have since been recognized as
having the abundance of all metals relative to hydrogen much lower
than in stars of the solar population. Spectra of two of these, HD
81192 (Boss 2527) and 8 Lep, were later shown as examples of the
group in the Yerkes Atlas of 1943."
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