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J/A+A/531/A143      Rotational velocities of HR stars        (Diaz+, 2011)

Accurate stellar rotational velocities using the Fourier transform of the cross correlation maximum. Diaz C.G., Gonzalez J.F., Levato H., Grosso M. <Astron. Astrophys., 531, A143 (2011)> =2011A&A...531A.143D
ADC_Keywords: Stars, nearby ; Rotational velocities Keywords: stars: fundamental parameters - stars: rotation - methods: data analysis Abstract: We propose a method for measuring the projected rotational velocity vsini with high precision even in spectra with blended lines. Though not automatic, our method is designed to be applied systematically to large numbers of objects without excessive computational requirement. We calculated the cross correlation function (CCF) of the object spectrum against a zero-rotation template and used the Fourier transform (FT) of the CCF central maximum to measure the parameter vsini taking the limb darkening effect and its wavelength dependence into account. The procedure also improves the definition of the CCF base line, resulting in errors related to the continuum position under 1% even for vsini=280km/s. Tests with high-resolution spectra of F-type stars indicate that an accuracy well below 1% can be attained even for spectra where most lines are blended. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 38 251 Results for 251 A1-A5 stars from the Bright Star Catalogue in the southern hemisphere
See also: V/50 : Bright Star Catalogue, 5th Revised Ed. (Hoffleit+, 1991) III/135 : Henry Draper Catalogue and Extension (Cannon+ 1918-1924; ADC 1989) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 6 I6 --- HD HD number, Cat. III/135 8- 12 F5.1 km/s <vsini> Mean rotational velocity 14- 16 F3.1 km/s err1 First method rms uncertainty on <vsini> (1) 18- 22 F5.2 km/s err2 Second method rms uncertainty on <vsini> (2) 24- 38 A15 --- SpType MK spectral type
Note (1): Standard deviation of the weighted mean of a sample of n uncorrelated observations with standard deviations ei. Note (2): Standard error of the mean σ/sqrt(n) for a set of measurements weighted according to their individual errors.
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 28-Oct-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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