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 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:
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FileName Lrecl Records Explanations
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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
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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
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Bytes Format Units Label Explanations
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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
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 23 A23 --- Name MACHO/OGLE name
27- 38 F12.6 d MJD Modified Julian Date
40- 44 F5.2 mag Ksmag ?=- Ks magnitude
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Acknowledgements:
Jura Borissova, jura.borissova(at)uv.cl
References:
Borissova et al., Paper I 2004A&A...423...97B 2004A&A...423...97B, Cat. J/A+A/423/97
Borissova et al., Paper II 2006A&A...460..459B 2006A&A...460..459B, Cat. J/A+A/460/459
(End) Patricia Vannier [CDS] 12-Jun-2009