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J/A+A/528/A148     uvbyβ photometry of early type stars    (Handler, 2011)

uvbyβ photometry of early type open cluster and field stars. Handler G. <Astron. Astrophys. 528, A148 (2011)> =2011A&A...528A.148H
ADC_Keywords: Clusters, open ; Stars, early-type ; Photometry, uvby, beta Keywords: stars: early-type - stars: fundamental parameters - open clusters and associations: general - techniques: photometric - stars: oscillations - asteroseismology Abstract: The β Cephei stars and slowly pulsating B (SPB) stars are massive main sequence variables. The strength of their pulsational driving strongly depends on the opacity of iron-group elements. As many of those stars naturally occur in young open clusters, whose metallicities can be determined in several fundamental ways, it is logical to study the incidence of pulsation in several young open clusters. To provide the foundation for such an investigation, Stroemgren-Crawford uvbyβ photometry of open cluster target stars was carried out to determine effective temperatures, luminosities, and therefore cluster memberships. In the course of three observing runs, uvbyβ photometry for 168 target stars was acquired and transformed into the standard system by measurements of 117 standard stars. The list of target stars also included some known cluster and field β Cephei stars, as well as β Cephei and SPB candidates that are targets of the asteroseismic part of the Kepler satellite mission. The uvbyβ photometric results are presented. The data are shown to be on the standard system, and the properties of the target stars are discussed: 140 of these are indeed OB stars, a total of 101 targets lie within the β Cephei and/or SPB star instability strips, and each investigated cluster contains such potential pulsators. These measurements will be taken advantage of in a number of subsequent publications. Description: The reduced uvbyβ photometry for all observed stars is presented. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table3.dat 62 117 uvbyβ photometry of standard stars table4.dat 62 107 uvbyβ photometry of open cluster target stars table5.dat 62 19 uvbyβ photometry of known β Cephei and other target stars table6.dat 62 42 uvbyβ photometry of early-type stars in the Kepler field
Byte-by-byte Description of file: table3.dat table4.dat table5.dat table6.dat
Bytes Format Units Label Explanations
1- 15 A15 --- Star Star identification (1) 17 I1 --- N Number of uvby measurements 20- 25 F6.3 mag Vmag ?=- V magnitude 26 A1 --- n_Vmag [*] * for measurement not used (2) 28- 33 F6.3 mag b-y ?=- b-y colour index 34 A1 --- u_b-y [:] : for measurement outside validity (3) 35 A1 --- n_b-y [*] * for measurement not used (2) 37- 42 F6.3 mag m1 ?=- m1 index 43 A1 --- u_m1 [:] : for measurement outside validity (3) 44 A1 --- n_m1 [*] * for measurement not used (2) 45- 50 F6.3 mag c1 ?=- c1 index 51 A1 --- u_c1 [:] : for measurement outside validity (3) 52 A1 --- n_c1 [*] * for measurement not used (2) 54- 58 F5.3 mag beta ?=- Hβ value 59 A1 --- u_beta [:] : for measurement outside validity (3) 60 A1 --- n_beta [*] * for measurement not used (2) 62 I1 --- o_beta Number of Hβ measurements
Note (1): Open cluster stars are identified with their WEBDA designation. Note (2): Measurements not used for computing transformation equations are marked with an asterisk Note (3): Measurements outside the validity of the transformation equations are marked with a colon
Acknowledgements: Gerald Handler, gerald.handler(at)
(End) Patricia Vannier [CDS] 28-Feb-2011
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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