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J/A+A/534/A94       Milky Way Cepheids radial velocities         (Storm+, 2011)

Calibrating the Cepheid period-luminosity relation from the infrared surface brightness technique. I. The p-factor, the Milky Way relations, and a universal K-band relation. Storm J., Gieren W., Fouque P., Barnes T.G., Pietrzynski G., Nardetto N., Weber M., Granzer T., Strassmeier K.G. <Astron. Astrophys. 534, A94 (2011)> =2011A&A...534A..94S
ADC_Keywords: Milky Way ; Stars, variable ; Stars, distances ; Radial velocities Keywords: stars: variable: Cepheids - stars: fundamental parameters - stars: distances - distance scale Abstract: We determine Period-Luminosity relations for Milky Way Cepheids in the optical and near-IR bands. These relations can be used directly as reference for extra-galactic distance determination to Cepheid populations with solar metallicity, and they form the basis for a direct comparison with relations obtained in exactly the same manner for stars in the Magellanic Clouds, presented in an accompanying paper. In that paper we show that the metallicity effect is very small and consistent with a null effect, particularly in the near-IR bands, and we combine here all 111 Cepheids from the Milky Way, the LMC and SMC to form a best relation. We employ the near-IR surface brightness (IRSB) method to determine direct distances to the individual Cepheids after we have recalibrated the projection factor using the recent parallax measurements to ten Galactic Cepheids and the constraint that Cepheid distances to the LMC should be independent of pulsation period. We confirm our earlier finding that the projection factor for converting radial velocity to pulsational velocity depends quite steeply on pulsation period, p=1.550-0.186*log(P) in disagrement with recent theoretical predictions. We find PL relations based on 70 Milky Way fundamental mode Cepheids of Mk=-3.33(±0.09)(log(P)-1.0)-5.66(±0.03), Wvi=-3.26(±0.11)(log(P)-1.0)-5.96(±0.04). Combining the 70 Cepheids presented here with the results for 41 Magellanic Cloud Cepheids which are presented in an accompanying paper, we find Mk=-3.30(±0.06)(log(P)-1.0)-5.65(±0.02), Wvi=-3.32(±0.08)(log(P)-1.0)-5.92(±0.03). We delineate the Cepheid PL relation using 111 Cepheids with direct distances from the IRSB analysis. The relations are by construction in agreement with the recent HST parallax distances to Cepheids and slopes are in excellent agreement with the slopes of apparent magnitudes versus period observed in the LMC. Description: Repeated high precision radial velocity measurements for 14 galactic Cepheids obtained with the STELLA telescope and echelle spectrograph are presented together with the associated time stamps. From these data radial velocity curves with good phase coverage can be established. The Cepheids observed are: V496 Aql, TT Aql, VZ Cyg, ζ Gem, X Pup, AQ Pup, BN Pup, LS Pup, VZ Pup, X Sgr, Y Sgr, BB Sgr, XX Sgr, YZ Sgr. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file stars.dat 63 14 Star list table3.dat 45 381 Time stamps and radial velocities
See also: J/A+A/534/A95 : LMC Cepheids radial velocities (Storm+, 2011) Byte-by-byte Description of file: stars.dat
Bytes Format Units Label Explanations
1- 10 A10 --- Name Star name 11- 12 I2 h RAh Simbad Hour of Right Ascension (J2000.0) 14- 15 I2 min RAm Simbad Minute of Right Ascension (J2000.0) 17- 20 F4.1 s RAs Simbad Second of Right Ascension (J2000.0) 22 A1 --- DE- Simbad Sign of the Declination (J2000.0) 23- 24 I2 deg DEd Simbad Degree of Declination (J2000.0) 26- 27 I2 arcmin DEm Simbad Arcminute of Declination (J2000.0) 29- 30 I2 arcsec DEs Simbad Arcsecond of Declination (J2000.0) 33- 37 F5.2 mag Bmag Simbad B band magnitude 39- 43 F5.2 mag Vmag Simbad V band magnitude 46- 52 A7 --- SpType Simbad MK spectral type 56- 63 F8.6 [d] logP Period (from table7 of the paper)
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 10 A10 --- Name Variable star identifier (GCVS) 12- 24 F13.5 d HJD Heliocentric Julian Date 27- 30 F4.2 --- Phase Pulsation phase 32- 38 F7.2 km/s HRV Heliocentric Radial Velocity 42- 45 F4.2 km/s e_HRV Estimated error on the Radial Velocity
Acknowledgements: Jesper Storm, jstorm(at)aip.de References: Strom et al., Paper II 2011A&A...534A..95S, Cat. J/+A/534/A95
(End) Jesper Storm [AIP, Germany], Patricia Vannier [CDS] 07-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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