J/A+A/373/625 uvbyβ photometry of lambda Bootis stars (Paunzen+, 2001)
A spectroscopic survey for lambda Bootis stars. II. The observational data.
Paunzen E., Duffee B., Heiter U., Kuschnig R., Weiss W.W.
<Astron. Astrophys. 373, 625 (2001)>
=2001A&A...373..625P 2001A&A...373..625P
ADC_Keywords: Stars, peculiar ; Photometry, uvby, beta ; Rotational velocities
Keywords: astronomical data bases - surveys: stars - lambda Bootis: stars -
chemically peculiar: stars - early type: stars -
fundamental parameters
Description:
Lambda 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 lambda
Bootis stars, we present the spectral classifications of all program
stars observed. These stars were selected on the basis of their
Stromgren uvbybeta colors as lambda Bootis candidates. In total, 708
objects in six open clusters, the Orion OB1 association and the
Galactic field were classified. In addition, nine 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, Cat. J/ApJS/99/135)
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,
Cat. J/ApJS/99/135)) 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 Stromgren
uvbybeta colors. Table 2 lists all observed Galactic field stars.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 93 652 Observed program stars in the Galactic field
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See also:
J/ApJS/99/135 : Rotation and Spectral Peculiarities (Abt+ 1995)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Name HD (Cat. III/135) or BD (Cat. I/122) number
11- 14 I4 --- HR ? HR (Cat. V/50) number
16- 21 I6 --- HIP ? HIP (Cat. I/239) number
23- 27 F5.2 mag Vmag V magnitude
29- 34 F6.3 mag b-y ? b-y colour index
36- 41 F6.3 mag m1 ? m1 index
44- 48 F5.3 mag c1 ? c1 index
51- 55 F5.3 mag beta ? beta index
57- 78 A22 --- SpType Spectral classification
79 A1 --- l_vsini Limit flag on vsini
80- 82 I3 km/s vsini ? vsini from the literature
83 A1 --- u_vsini Uncertainty flag on vsini
85- 93 A9 --- ID Night(s) in which the star was observed
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Acknowledgements: Ernst Paunzen
References:
Paunzen & Gray, Paper I 1997A&AS..126..407P 1997A&AS..126..407P
Paunzen, Paper III 2001A&A...373..633P 2001A&A...373..633P
(End) E. Paunzen [IfA, Vienna], Patricia Bauer [CDS] 21-Jun-2001