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J/A+A/502/505       Ks photometry of LMC RR Lyrae            (Borissova+, 2009)

Properties of RR Lyrae stars in the inner regions of the Large Magellanic Cloud. III. Near-infrared study. Borissova J., Rejkuba M., Minniti D., Catelan M., Ivanov V.D. <Astron. Astrophys. 502, 505 (2009)> =2009A&A...502..505B
ADC_Keywords: Magellanic Clouds ; Stars, variable ; Photometry, infrared Keywords: galaxies: Magellanic Clouds - stars: variables: RR Lyr - galaxies: distances and redshifts - stars: oscillations Abstract: RR Lyrae variable stars are the primary Population II distance indicator. Likewise, the LMC constitutes a key step in the extragalactic distance scale. By combining near-IR photometry and spectroscopically measured metallicities for a homogeneous sample of 50 RR Lyr stars in the Large Magellanic Cloud (LMC), we investigate the metallicity dependence of the period-luminosity relation in the near-infrared (IR), use the newly derived relations to re-derive the distance to the LMC, and compare the distance moduli obtained from RR Lyr and red clump stars. Description: This paper presents new (single-epoch) J-band and (multi-epoch) Ks-band photometry of RR Lyr stars in 7 different LMC fields, observed with the near-IR camera SOFI at ESO's New Technology Telescope. Additional Ks-band data for another two LMC fields were taken with the ISPI infrared array at CTIO's Blanco 4m telescope. The near-IR photometry was cross-correlated with the MACHO and OGLE databases, resulting in a catalog of 62 RR Lyr stars with BV RIJKs photometry. A subsample of 50 stars also has spectroscopically mea sured metallicities. In the deep JK color-magnitude diagrams of 7 fields, red giant branch, red clump and RR Lyr stars are detected. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file stars.dat 49 31 Star positions (from MACHO (II/247) and OGLE (J/AcA/53/93) table5.dat 44 144 Individual Ks measurements
See also: II/247 : Variable Stars in the Large Magellanic Clouds (MACHO, 2001) J/AcA/53/93 : OGLE RR Lyrae in LMC (Soszynski+, 2003) J/A+A/423/97 : LMC RR Lyrae radial velocities. I. (Borissova+, 2004) J/A+A/460/459 : LMC RR Lyrae Radial velocities. II. (Borissova+, 2006) Byte-by-byte Description of file: stars.dat
Bytes Format Units Label Explanations
1- 2 I2 h RAh Right ascension (J2000) 4- 5 I2 min RAm Right ascension (J2000) 7- 12 F6.3 s RAs Right ascension (J2000) 14 A1 --- DE- Declination sign (J2000) 15- 16 I2 deg DEd Declination (J2000) 18- 19 I2 arcmin DEm Declination (J2000) 21- 25 F5.2 arcsec DEs Declination (J2000) 27- 49 A23 --- Name MACHO/OGLE name
Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
1- 23 A23 --- Name MACHO/OGLE name 27- 38 F12.6 d MJD Modified Julian Date 40- 44 F5.2 mag Ksmag ?=- Ks magnitude
Acknowledgements: Jura Borissova, jura.borissova(at)uv.cl References: Borissova et al., Paper I 2004A&A...423...97B, Cat. J/A+A/423/97 Borissova et al., Paper II 2006A&A...460..459B, Cat. J/A+A/460/459
(End) Patricia Vannier [CDS] 12-Jun-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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