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J/AJ/146/141 BV photometry of dwarf Cepheids in Carina (Vivas+, 2013)
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Beginning of ReadMe :J/AJ/146/141 BV photometry of dwarf Cepheids in Carina (Vivas+, 2013)
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A comprehensive, wide-field study of pulsating stars in the Carina dwarf
spheroidal galaxy.
Vivas A.K., Mateo M.
<Astron. J., 146, 141 (2013)>
=2013AJ....146..141V
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ADC_Keywords: Galaxies, nearby ; Stars, variable ; Photometry, UBV ; Reddening
Keywords: galaxies: dwarf - galaxies: individual: Carina -
galaxies: stellar content - Local Group - stars: variables: general
Abstract:
We report the detection of 388 pulsating variable stars (and some
additional miscellaneous variables) in the Carina dwarf spheroidal
galaxy over an area covering the full visible extent of the galaxy and
extending a few times beyond its photometric (King) tidal radius along
the direction of its major axis. Included in this total are 340 newly
discovered dwarf Cepheids (DCs), which are mostly located 2.5mag
below the horizontal branch and have very short periods (<0.1days),
typical of their class and consistent with their location on the upper
part of the extended main sequence of the younger populations of the
galaxy. Several extra-tidal DCs were found in our survey up to a
distance of 1deg from the center of Carina. Our sample also
includes RR Lyrae stars and anomalous Cepheids, some of which were
found outside the galaxy's tidal radius as well. This supports past
works that suggest that Carina is undergoing tidal disruption. We use
the period-luminosity relationship for DCs to estimate a distance
modulus of mu_0_=20.17+/-0.10mag, in very good agreement with the
estimate from RR Lyrae stars. We find some important differences in
the properties of the DCs of Carina and those in Fornax and the LMC,
the only extragalactic samples of DCs currently known. These
differences may reflect a metallicity spread, depth along the line of
sight, and/or different evolutionary paths of the DC stars.
Description:
Multi-epoch observations of eight fields around the Carina dSph galaxy
were taken with the MOSAIC-II camera at the 4m Blanco Telescope at
Cerro Tololo Inter-American Observatory (CTIO), Chile, during an
interval of six consecutive nights in 2007 December. The MOSAIC-II
camera consists of eight 2048*4096 CCDs