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J/A+A/460/459       Radial velocities of LMC RR Lyrae        (Borissova+, 2006)

Properties of RR Lyrae stars in the inner regions of the Large Magellanic Cloud. II. The extended sample. Borissova J., Minniti D., Rejkuba M., Alves D. <Astron. Astrophys., 460, 459-466 (2006)> =2006A&A...460..459B (SIMBAD/NED BibCode)
ADC_Keywords: Stars, variable ; Magellanic Clouds ; Radial velocities Keywords: galaxies: structure - stars: variables: RR Lyrae - Magellanic Clouds - stars: kinematics Abstract: All galaxies that have been adequately examined so far have shown an extended stellar halo. To search for such a halo in the LMC we have obtained low-resolution spectra for 100 LMC RR Lyrae stars, of which 87 are in the field and 13 in the clusters NGC 1835 and NGC 2019. We measured radial velocities for 87 LMC RR Lyrae stars, and metallicities for 78 RR Lyrae stars, nearly tripling the previous sample. These targets are located in 10 fields covering a wide range of distances, out to 2.5 degrees from the center of the LMC. Description: In Paper I (Cat. J/A+A/423/97) we presented radial velocities, metallicities and K-band magnitudes of 74 RR Lyrae stars in the inner regions of the LMC. The optical low resolution spectra were obtained with the FORS1 at the ESO VLT and near-IR photometry images with the SOFI infrared array at the ESO NTT. We have chosen to extend this sample by using the MACHO (Alcock et al., 2000, Cat. J/ApJ/542/257) and OGLE (Zebrun et al., 2001AcA....51..317Z) databases to seven fields of the LMC bar, at distances from 0.4 to 2.5 degrees away from the rotation center (Soszynski et al., 2003, Cat. J/AcA/53/93). Two of these new fields are centered on the LMC clusters NGC 1835 and NGC 2019. We also observed additional stars in the fields LMC-4, LMC-9 and LMC-14 defined in Paper I. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table9.dat 58 150 The whole sample of the LMC RR Lyrae stars taken with FORS1, FORS2 and GMOS
See also: II/247 : Variable Stars in the Large Magellanic Clouds (MACHO, 2001) J/ApJ/542/257 : MACHO LMC first-overtone RR Lyrae (Alcock+, 2000) J/AcA/53/93 : OGLE RR Lyrae in LMC (Soszynski+, 2003) J/A+A/423/97 : LMC RR Lyrae radial velocities (Borissova+, 2004) Byte-by-byte Description of file: table9.dat
Bytes Format Units Label Explanations
1- 23 A23 --- Name MACHO/OGLE name (1) 26- 28 I3 km/s RV Radial velocity 30- 31 I2 km/s e_RV rms uncertainty on RV 33- 34 I2 --- S/N Signal-to-noise ratio 36- 40 F5.2 [Sun] [Fe/H] ?=- Metallicity 42- 46 F5.2 mag Vmag V magnitude 48- 53 F6.4 d Per Period 55- 58 A4 --- VType RR Lyrae type
Note (1): Star "MACHO 11.8623.3792" in original table corrected into "MACHO 14.8623.3792".
History: From electronic version of the journal References: Borissova et al., Paper I 2004A&A...423...97B, Cat. J/A+A/423/97
(End) Patricia Vannier [CDS] 12-Jun-2009
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