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A New Procedure for the Photometric Parallax Estimation

Published online by Cambridge University Press:  05 March 2013

S. Karaali ,
Y. Karataş ,
S. Bilir ,
S. G. Ak  and
E. Hamzaoğlu
S. Karaali*
Affiliation:
Department of Astronomy and Space Sciences, Science Faculty, Istanbul University, 34452 Istanbul, Turkey
Y. Karataş
Affiliation:
Department of Astronomy and Space Sciences, Science Faculty, Istanbul University, 34452 Istanbul, Turkey
S. Bilir
Affiliation:
Department of Astronomy and Space Sciences, Science Faculty, Istanbul University, 34452 Istanbul, Turkey
S. G. Ak
Affiliation:
Department of Astronomy and Space Sciences, Science Faculty, Istanbul University, 34452 Istanbul, Turkey
E. Hamzaoğlu
Affiliation:
Faculty of Engineering and Design, Istanbul Commerce University, 34378 Istanbul, Turkey.
*
[email protected]
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Abstract

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We present a new procedure for photometric parallax estimation. The data for 1236 stars provide calibrations between the absolute magnitude offset from the Hyades main-sequence and the ultraviolet-excess for eight different (B–V)0 colour-index intervals, (0.3 0.4), (0.4 0.5), (0.5 0.6), (0.6 0.7), (0.7 0.8), (0.8 0.9), (0.9 1.0) and (1.0 1.1). The mean difference between the original and estimated absolute magnitudes and the corresponding standard deviation are rather small, +0.0002 and ±0.0613 mag. The procedure has been adapted to the Sloan photometry by means of colour equations and applied to a set of artificial stars with different metallicities. The comparison of the absolute magnitudes estimated by the new procedure and the canonical one indicates that a single colour–magnitude diagram does not supply reliable absolute magnitudes for stars with large range of metallicity.

Keywords

photometric parallaxUBV photometrySloan photometry
Type
Research Article
Information
Publications of the Astronomical Society of Australia , Volume 20 , Issue 3 , 2003 , pp. 270 - 278
Copyright
Copyright © Astronomical Society of Australia 2003

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