SIMBAD references

2014MNRAS.438.2440D - Mon. Not. R. Astron. Soc., 438, 2440-2455 (2014/March-1)

Chemical and structural analysis of the Large Magellanic Cloud using the fundamental mode RR Lyrae stars.

DEB S. and SINGH H.P.

Abstract (from CDS):

We present a careful and detailed light-curve analysis of publicly available I-band data on fundamental mode RR Lyrae (RRab) stars of the Large Magellanic Cloud (LMC) obtained by the Optical Gravitational Lensing Experiment phase-III project. Using the Fourier parameters of 13 095 RRab stars, metallicities and absolute magnitudes of individual stars are obtained. The representation of stars on the P-φ_31^V plane shows the existence of three significant metallicity groups with mean metallicities as -1.20±0.12, -1.57±0.10 and -1.89±0.09dex. The corresponding absolute magnitudes of these three groups are obtained as 0.70±0.08, 0.59±0.06 and 0.49±0.08 mag, respectively. Distribution of these three groups as a function of vertical {verbar}z{verbar} distance indicates that the formation of the LMC disc predates the formation of the inner halo. Issue of the existence of a metallicity gradient as a function of galactocentric distances has also been addressed. Approximating the structure of the LMC disc as a triaxial ellipsoid, the inclination angle (i) relative to the plane of the sky and the position angle of the line of nodes (θlon) were estimated as 24 _.^○20 and 176 _.^○01, respectively. The axes ratios and the eccentricity were also determined using the principal axis transformation method.

Abstract Copyright: © 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2014)

Journal keyword(s): stars: fundamental parameters - stars: Population II - stars: variables: RR Lyrae - Magellanic Clouds - galaxies: statistics - galaxies: structure

VizieR on-line data: <Available at CDS (J/MNRAS/438/2440): table3.dat table1.dat table2.dat>

Status at CDS : All or part of tables of objects could be ingested in SIMBAD with priority 2.

Simbad objects: 13098

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2021.11.28-21:15:02

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