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Astron. Astrophys. 337, 178-182 (1998)


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A test of B-type star H[FORMULA] photometric distances via the Hipparcos parallaxes *

N. Kaltcheva 1 and J. Knude 2

1 School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, Fife, KY16 9SS, UK (ntk@st-andrews.ac.uk)
2 Niels Bohr Institute for Astronomy, Physics and Geophysics, Juliane Maries Vej 30, DK-2100 Copenhagen O, Denmark (indus@astro.ku.dk)

Received 20 April 1998 / Accepted 4 June 1998

Abstract

We test the photometric uvby [FORMULA] distances for B III, IV and V type stars, with an emphasis on the effect of rotation on the [FORMULA] determination. From the [FORMULA](uvby [FORMULA]) calibration of Balona & Shobbrook (1984), we have derived the absolute visual magnitudes for 176 stars with v sin (i) measurements and have compared them to [FORMULA] values derived via the parallaxes, measured by Hipparcos. For the luminosity classes IV and V there is a good agreement between the photometric and trigonometric distances and no dependence on rotation. The photometric [FORMULA] values for luminosity class III show a tendency to be slightly larger than the corresponding Hipparcos determination. Probably this is due to the photometric calibration itself and it is not connected to the stellar rotation. Using the Hipparcos data, we also test the Crawford's (1978) [FORMULA]([FORMULA]) reference line and the Philip & Egret (1980) and Schönberner & Harmanec (1995) [FORMULA]([FORMULA]) reference lines. The last one shows disagreement with the trigonometric luminosities at the bright star end.

Key words: techniques: photometric – stars: distances – stars: early-type – stars: rotation

* Based on data from the ESA Hipparcos astrometry satellite

Send offprint requests to: Jens Knude

© European Southern Observatory (ESO) 1998

Online publication: August 6, 1998

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