Issue |
A&A
Volume 373, Number 2, July II 2001
|
|
---|---|---|
Page(s) | 625 - 632 | |
Section | Interstellar and circumstellar matter | |
DOI | https://doi.org/10.1051/0004-6361:20010630 | |
Published online | 15 July 2001 |
A spectroscopic survey for λ Bootis stars*
II. The observational data
1
Institut für Astronomie der Universität Wien, Türkenschanzstr. 17, 1180 Wien, Austria
2
Zentraler Informatikdienst der Universität Wien, Universitätsstr. 7, 1010 Wien, Austria
3
Department of Computer Science Keele University, Keele, Staffordshire, UK
4
Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia, Canada
Corresponding author: E. Paunzen, Ernst.Paunzen@univie.ac.at
Received:
3
April
2001
Accepted:
27
April
2001
λ Bootis stars comprise only a small number of all A-type stars and are characterized as
nonmagnetic, Population i, late B to early F-type dwarfs which show significant
underabundances of metals whereas the light
elements (C, N, O and S) are almost normal abundant compared to the Sun.
In the second paper on a spectroscopic survey for λ Bootis stars, we present the
spectral classifications of all program stars observed. These stars were selected
on the basis of their Strömgren colors as λ Bootis candidates. In total,
708 objects in six open clusters, the Orion OB1 association and the Galactic field
were classified.
In addition, 9 serendipity non-candidates in the vicinity of our
program stars as well as 15 Guide Star Catalogue stars were observed resulting in a
total of 732 classified stars. The 15 objects from the Guide
Star Catalogue are part of a program for
the classification of apparent variable stars from the Fine Guidance Sensors
of the Hubble Space Telescope.
A grid of 105 MK standard as well as "pathological" stars guarantees
a precise classification. A comparison of our spectral classification
with the extensive work of Abt & Morrell ([CITE]) shows no significant differences.
The derived types are 0.23 ± 0.09 (rms error per measurement)
subclasses later and 0.30 ± 0.08 luminosity classes more luminous than those
of Abt & Morrell ([CITE]) based on a sample of 160 objects in common. The estimated
errors of the means are ± 0.1 subclasses.
The characteristics of our sample are discussed in respect to the
distribution on the sky, apparent visual magnitudes and Strömgren
colors.
Key words: astronomical data bases / surveys / stars: chemically peculiar / stars: early type / stars: fundamental parameters
© ESO, 2001
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