A spectroscopic survey for λ Bootis stars II. The observational data
- Author(s)
- Ernst Paunzen, B Duffee, Ulrike Heiter, Rainer Kuschnig, Werner Wolfgang Weiss
- Abstract
? 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 ? Bootis stars, we present the spectral classifications of all program stars observed. These stars were selected on the basis of their Strošmgren uvbyß colors as ? 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 (1995) 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 (1995) 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 Strošmgren uvbyß colors.
- Organisation(s)
- Department of Astrophysics, Vienna University Computer Center
- External organisation(s)
- Keele University, University of British Columbia (UBC)
- Journal
- Astronomy & Astrophysics
- Volume
- 373
- Pages
- 625-632
- No. of pages
- 8
- ISSN
- 0004-6361
- DOI
- https://doi.org/10.1051/0004-6361:20010630
- Publication date
- 2001
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 103003 Astronomy
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/e9ce6616-29ab-4bfd-b156-70392c318155