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J/A+A/502/951    HARPS observations of nine galactic Cepheids  (Nardetto+, 2009)

High resolution spectroscopy for Cepheids distance determination. V. Impact of the cross-correlation method on the p-factor and the gamma-velocities. Nardetto N., Gieren W., Kervella P., Fouque P., Storm J., Pietrzynski G., Mourard D., Queloz D. <Astron. Astrophys. 502, 951 (2009)> =2009A&A...502..951N
ADC_Keywords: Stars, variable ; Spectroscopy ; Radial velocities Keywords: techniques: spectroscopic - stars: atmospheres - stars: oscillations - stars: variables: Cepheids - stars: distances Abstract: We observed eight galactic Cepheids with the HARPS spectrograph. For each star, we derive an interpolated cross-correlated radial velocity curve using the HARPS pipeline. Pulsating phases and HARPS radial velocity measurements can be found in Table 1. The cross correlation method is widely used to derive the radial velocity curve of Cepheids when the signal to noise ratio of the spectra is low. However, if it is used with an inac curate projection factor, it might introduce some biases in the Baade-Wesselink (BW) methods of determining the distance of Cepheids. In addition, it might affect the average value of the radial velocity curve (or gamma-velocity) important for Galactic structure studies. See the paper for details and results. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 29 8 The Cepheids studied listed with increasing period table45.dat 25 119 HARPS cross-correlated radial velocities of eight Cepheids
See also: J/A+A/453/309 : HARPS observations of nine galactic Cepheids (Nardetto+ 2006) J/A+A/489/1255 : HARPS observations of eight galactic Cepheids (Nardetto+ 2008) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 8 A8 --- Name Star name 10- 17 F8.5 d Per Period 19- 20 I2 % D4896 Depth of the FeI 4896.439Å spectral line 22- 25 F4.1 km/s DRVc Amplitude of the radial velocity curve of FeI 4896.439Å 27- 29 F3.1 km/s e_DRVc rms uncertainty on DRVc
Byte-by-byte Description of file: table45.dat
Bytes Format Units Label Explanations
1- 8 A8 --- Name Star name 10- 13 F4.2 --- Phase Pulsating phase (1) 15- 20 F6.2 km/s RVcc Cross-correlated radial velocity 22- 25 F4.2 km/s e_RVcc rms uncertainty on RVcc
Note (1): Ephemeris can be found in Nardetto et al. 2006, Cat. J/A+A/453/309
Acknowledgements: N. Nardetto, nnardetto(at)astro-udec.cl References: Nardetto et al., Paper I 2006A&A...453..309N, Cat. J/A+A/453/309 Nardetto et al., Paper II 2007A&A...471..661N Nardetto et al., Paper III 2008A&A...489.1255N, Cat. J/A+A/489/1255 Nardetto et al., Paper IV 2008A&A...489.1263N
(End) Patricia Vannier [CDS] 04-Jul-2009
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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