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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
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:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 93 652 Observed program stars in the Galactic field
See also: J/ApJS/99/135 : Rotation and Spectral Peculiarities (Abt+ 1995) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
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
Acknowledgements: Ernst Paunzen References: Paunzen & Gray, Paper I 1997A&AS..126..407P Paunzen, Paper III 2001A&A...373..633P
(End) E. Paunzen [IfA, Vienna], Patricia Bauer [CDS] 21-Jun-2001
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