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J/A+A/441/631       Δa photometry of CP stars          (Paunzen+, 2005)

On the detection of chemically peculiar stars using Δa photometry. Paunzen E., Stuetz C., Maitzen H.M. <Astron. Astrophys., 441, 631-640 (2005)> =2005A&A...441..631P
ADC_Keywords: Stars, peculiar ; Photometry, uvby Keywords: stars: chemically peculiar - stars: early-type - techniques: photometric Abstract: We have summarized all Δa measurements for galactic field stars (1474 objects) from the literature published over more than two decades. These measurements were, for the first time, compiled and homogeneously analyzed. The Δa intermediate band photometric system samples the depth of the 5200Å flux depression by comparing the flux at the center with the adjacent regions with bandwidths of 110Å to 230Å. Because it was slightly modified over the last three decades, we checked for systematic trends for the different measurements but found no correlations whatsoever. The Δa photometric system is most suitable to detecting magnetic chemically peculiar (CP) stars with high efficiency, but is also capable of detecting a small percentage of non-magnetic CP objects. Furthermore, the groups of (metal-weak) lambda Bootis, as well as classical Be/shell stars, can be successfully investigated. In addition, we also analyzed the behaviour of supergiants (luminosity class I and II). On the basis of apparent normal type objects, the correlation of the 3sigma significance limit and the percentage of positive detection for all groups was derived. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table4.dat 29 300 Confirmed chemically peculiar stars from Renson (1991, Cat. III/162), the type of peculiarity was taken from the literature
See also: http://obswww.unige.ch/gcpd/ph75.html : Maitzen photometric system III/162 : General Catalogue of Ap and Am stars (Renson+ 1991) Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 5 I5 --- Ren Renson (III/162) number of the star 7- 12 I6 --- HD ?=- HD (III/135) number of the star 14- 16 I3 mmag (b-y)0 Dereddened b-y colour index 18- 19 I2 mmag Da Δa index in Maitzen photometric system 22- 29 A8 --- Spec Spectral type of CP star
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 28-Jul-2006
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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