Issue |
A&A
Volume 435, Number 3, June I 2005
|
|
---|---|---|
Page(s) | 949 - 954 | |
Section | Stellar structure and evolution | |
DOI | https://doi.org/10.1051/0004-6361:20042289 | |
Published online | 13 May 2005 |
The absolute magnitude of K0V stars from Hipparcos data using an analytical treatment of the Malmquist bias
1
Pulkovo Observatory, Pulkovskoye shosse 65, Saint-Petersburg 196140, Russia e-mail: butkevich@regal.spb.ru
2
Tuorla Observatory, 21500 Piikkiö, Finland e-mail: andber@utu.fi; pekkatee@utu.fi
Received:
1
November
2004
Accepted:
28
January
2005
We calculate the average absolute magnitude for
Hipparcos single K0V stars, using a theoretical curve for the
distance-dependent Malmquist bias in the data. This method is
shown to be well applicable to stellar data with good parallaxes
and gives results in agreement with a previous study that used
another treatment of the bias developed in extragalactic astronomy
(finding the “unbiased plateau”). In particular, we point out
that such a fit, which uses stars in the biased part of the
sample, may be less vulnerable to the fluctuations in the unbiased
plateau whose definition is also somewhat subjective. We found for
K0V stars , with the spread of the luminosity function
being 0.3 mag. It is shown that inclusion of Hipparcos non-single
stars may underestimate M0 by about 0.05–0.1 mag. During the
study it was found that about 20% of the sample may be
mis-classified K0IV stars.
Key words: methods: statistical / stars: distances / stars: fundamental parameters
© ESO, 2005
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.