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 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 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 2004A&A...423...97B, Cat. J/A+A/423/97
(End) Patricia Vannier [CDS] 12-Jun-2009