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A Deep Spectral Survey of Peculiar A-Type Stars

Published online by Cambridge University Press:  12 April 2016

Omar M. Kurtanidze  and
Miriam G. Nikolashvili
Omar M. Kurtanidze
Affiliation:
Abastumani Astrophysical Observatory, 383762 AbastumaniRepublic of Georgia
Miriam G. Nikolashvili
Affiliation:
Abastumani Astrophysical Observatory, 383762 AbastumaniRepublic of Georgia

Abstract

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We are conducting a long-term deep spectral survey to investigate the distribution of Ap and Am stars in selected fields of the Milky Way and in open star clusters of different ages. The spectral survey is based on objective prism spectra obtained with an eight degree prism attached to the 70/98 cm meniscus telescope (f/3, 135 Å mm−1 at Hδ) at the Abastumani Observatory. Kodak IIIa-J emulsions hypersensitized by baking in nitrogen gas are used in combination with a 500 Å FWHM filter centered on Hδ. A limiting magnitude of mB = 14 was reached in an exposure time of 120 m. Study of the objective prism plates is still in a very early stage. Observations of the central part of the same field taken with a CCD resulted in a limiting magnitude mB = 16. On the basis of spectral material obtained, a wide range of spectra may be classified in the MK system.

Type
X. Stellar Astronomy
Information
International Astronomical Union Colloquium , Volume 148: The Future Utilisation of Schmidt Telescopes , 1995 , pp. 353 - 356
Copyright
Copyright © Astronomical Society of the Pacific 1995

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