By J. Andersen (auth.), T. R. Bedding, A. J. Booth, J. Davis (eds.)
This Symposium begun with a suggestion for a gathering to honour Emer itus Professor Robert Hanbury Brown at the celebration of his eightieth birthday. He asked that this type of assembly can be on a subject that may be of gain to the Sydney collage Stellar Interferometer (SUSI) software. With SUSI and several excessive angular solution tools both in operation or approaching line in the subsequent decade, and with advances in astrometry, spectroscopy and in theoretical types of stellar atmospheres and interiors, it looked to be either applicable and well timed to carry a symposium on "Fundamental Stellar houses: the interplay among commentary and conception. " The emphasis of the assembly used to be at the severe evaluate of the qual ity, accuracy, and customers for development of the observational facts and theoretical types, at the amazing difficulties in stellar astrophysics, and at the feasibility of accomplishing the observational and theoretical advances required for his or her answer. Invited papers comprised the key a part of the oral software and the audio system replied to the problem issued via the clinical setting up Committee to significantly evaluation the present prestige and customers for his or her distinctiveness. The Symposium used to be opened by way of the Chancellor of the collage of Sydney, Emeritus Professor Dame Leonie Kramer, who welcomed the 126 individuals from 22 international locations on behalf of the college. The oral software integrated . fifty two invited studies and papers and 10 contributed papers.
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Extra resources for Fundamental Stellar Properties: The Interaction Between Observation and Theory: Proceedings of the 189th Symposium of the International Astronomical Union, Held at the Women’s College, University of Sydney, Australia, 13–17 January 1997
J. imore (in press) Welch D. : 1994, Astron . J. 0 Fig. I. Zero-point calibration of visual surface brightness by angular diameter measurements of non variable stars. 30. Solid circles: dwarfs and giants. g Fig. 2. BW vs. ZAMS distances of Cepheids in clusters. Solid line: locus of equal distances. 24 mag (2-sigma scatter). Open circles are stars falling more than 3 sigmas away from solid line. 1--,----=·~~~ir-. 5 9 10 11 12 13 14 ZAMS Distance modulus (mag) Discussion of this paper appears at the end of these Proceedings.
The 60 000 fainter stars have been selected from the proposals on grounds of scientific merit. 7. 500 parsecs. 2. SOME STATISTICS ON PARALLAXES The Hipparcos data are providing a dramatic increase, qualitatively and quantitatively, of the basic distance information available for any application. 5, 10 and 20 % is available from Hipparcos data and from ground-based data are given in Table 3. TABLE 3. ,.. ,.. < 1% < 5% < 10% < 20% 442 7388 22396 ground-based a few tens 100 '? 1000 '? 50643 Moreover, the range of spectral types and luminosity classes for which precise parallaxes are available is considerably enlarged, especially towards 16 C.
Of Copenhagen, Copenhagen, p. M. , Weigert A. J. 1996, ApJ 467, 819 2. STELLAR DISTANCES THE HIPPARCOS RESULTS C. TURON 1 2 Dasgal / URA CNRS 335, Observatoire de Paris-Meudon 92 195 MEUDON Cedex, France Abstract. After a brief presentation of the Hipparcos missiOn, and an overview of the astrometric and photometric results obtained from the main mission and from Tycho, more details are given on the parallaxes. 97 mas for stars brighter than 9. This precision varies with apparent magnitude and ecliptic latitude.
Fundamental Stellar Properties: The Interaction Between Observation and Theory: Proceedings of the 189th Symposium of the International Astronomical Union, Held at the Women’s College, University of Sydney, Australia, 13–17 January 1997 by J. Andersen (auth.), T. R. Bedding, A. J. Booth, J. Davis (eds.)