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Astron. Astrophys. 341, L55-L58 (1999)

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Letter to the Editor

The absolute magnitude of K0V stars from HIPPARCOS parallaxes

René D. Oudmaijer 1, Martin A.T. Groenewegen 2 and Hans Schrijver 3

1 Astrophysics Group, Imperial College of Science, Technology and Medicine, Prince Consort Road, London, SW7 2BZ, UK
2 Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Strasse 1, D-85740 Garching, Germany
3 SRON, Sorbonnelaan 2, 3584 CA Utrecht, The Netherlands

Received 9 October 1998 / Accepted 13 November 1998

Abstract

We investigate the properties of K0V stars with Hipparcos parallaxes and spectral types taken from the Michigan Spectral Survey. The sample of 200 objects allows the empirical investigation of the magnitude selection (Malmquist) bias, which appears clearly present. By selecting those objects that are not affected by bias, we find a mean absolute magnitude of [FORMULA] = 5.7, a downward revision from 5.9 mag. listed in Schmidt-Kaler (1982). Some objects have absolute magnitudes far brighter than [FORMULA] = 5.7, and it is suggested that these objects ([FORMULA] 20% of the total sample) are K0IV stars which may have been mis-classified as a K0V star. The presence of the Malmquist bias in even this high quality sample suggests that no sample can be expected to be bias-free.

Key words: stars: distances – stars: fundamental parameters – stars: late-type

Send offprint requests to: René Oudmaijer

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© European Southern Observatory (ESO) 1999

Online publication: December 4, 1998
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