J/MNRAS/437/2307 LMC anomalous Cepheid Ks light curves (Ripepi+, 2014)
The VMC Survey. VIII. First results for anomalous Cepheids.
Ripepi V., Marconi M., Moretti M.I., Clementini G., Cioni M.-R.L.,
de Grijs R., Emerson J.P., Groenewegen M.A.T., Ivanov V.D., Oliveira J.M.
<Mon. Not. R. Astron. Soc., 437, 2307-2319 (2014)>
=2014MNRAS.437.2307R 2014MNRAS.437.2307R
ADC_Keywords: Magellanic Clouds ; Stars, variable ; Photometry, infrared
Keywords: surveys - stars: variables: Cepheids -
galaxies: distances and redshifts - Magellanic Clouds
Abstract:
The VISTA near-infrared YJKs survey of the Magellanic Clouds System
(VMC, PI M.-R. L. Cioni) is collecting deep Ks-band time-series
photometry of the pulsating variable stars hosted in the system formed
by the two Magellanic Clouds and the Bridge connecting them. In this
paper, we present for the first time Ks-band light curves for
anomalous Cepheid (AC) variables. In particular, we have analysed a
sample of 48 Large Magellanic Cloud ACs, for which identification and
optical magnitudes were obtained from the OGLE III and IV catalogues.
The VMC Ks-band light curves for ACs are well sampled, with the number
of epochs ranging from 8 to 16, and allowing us to obtain very precise
mean Ks magnitudes with errors on average of the order of 0.01mag. The
<Ks> values were used to build the first period-luminosity and
period-Wesenheit relations in the near-infrared for fundamental mode
and first overtone ACs. At the same time we exploited the optical (V,
I) OGLE data to build accurate period-luminosity,
period-luminosity-colour and period-Wesenheit relations both for
fundamental mode and first overtone ACs. For the first time, these
relations were derived from a sample of pulsators which uniformly
cover the whole AC instability strip. The application of the optical
period-Wesenheit relation to a sample of dwarf galaxies hosting a
significant population of ACs revealed that this relation is a
valuable tool for deriving distances within the Local Group. Due to
its lower dispersion, we expect the Ks period-Wesenheit relations
first derived in this paper to represent a valuable tool for measuring
accurate distances to galaxies hosting ACs when more data in
near-infrared filters become available.
Description:
ACs in the LMC were identified and characterized in the optical bands
by Soszynski et al. (2008AcA....58..293S 2008AcA....58..293S, Cat. J/AcA/58/293, and
references therein) as part of the OGLE III project. For the LMC tile
8_8 [including the South Ecliptic Pole (SEP)] which lies outside the
area imaged by OGLE III, we used results of an early release of stage
IV of the OGLE survey (Soszynski et al., 2012AcA....62..219S 2012AcA....62..219S, Cat.
J/AcA/62/219). In these surveys, a total of 86 ACs were found (83 by
OGLE III and 3 by OGLE IV), of which 66 are F and 20 are FO pulsators.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table2.dat 102 48 Cross-identification and main characteristics of
the ACs in the 11 'tiles' analysed in this paper
table4.dat 59 42 Results for the 42 ACs with useful light curves
analysed in this paper
lc/* . 46 Individual Ks time series photometry
(table3 of the paper)
--------------------------------------------------------------------------------
See also:
J/AcA/58/293 : Type-II and anomalous Cepheids in LMC (Soszynski+, 2008)
J/AcA/62/219 : OGLE: Gaia South Ecliptic Pole Field (Soszynski+, 2012)
J/A+A/531/A157 : LMC planetary nebulae (VMC Survey II) (Miszalski+, 2011)
J/A+A/537/A105 : Modelisation of AGB stars in the LMC (Gullieuszik+, 2012)
J/MNRAS/424/1807 : VISTA Magellanic Cloud Survey. V. Cepheids (Ripepi+, 2012)
J/A+A/549/A29 : Quasars behind the Magellanic system (Cioni+, 2013)
J/A+A/554/A33 : VMC Survey. VII. 30 Doradus reddening map (Tatton+, 2013)
J/MNRAS/437/2702 : MC Cepheids, RR Lyrae stars and binaries (Moretti+, 2014)
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 17 A17 --- Name OGLE identification
(OGLE-LMC-ACEP-NNN or LMC571.05.5070)
20 I1 h RAh OGLE right ascension (J2000)
22- 23 I2 min RAm OGLE right ascension (J2000)
25- 29 F5.2 s RAs OGLE right ascension (J2000)
31 A1 --- DE- OGLE declination sign (J2000)
32- 33 I2 deg DEd OGLE declination (J2000)
35- 36 I2 arcmin DEm OGLE declination (J2000)
38- 41 F4.1 arcsec DEs OGLE declination (J2000)
43- 44 A2 --- Mode F (fundamental) or FO (1st overtone) mode
46- 54 F9.7 d Per Period
56- 66 F11.5 d T0 Epoch of maximum light (JD-2400000)
68- 73 F6.3 mag <Imag> Intensity-averaged I magnitude (OGLE)
75- 80 F6.3 mag <Vmag> Intensity-averaged V magnitude (OGLE)
82- 93 I12 --- VMC Vista Magellanic Cloud identification
95- 97 A3 --- Tile VMC tile
99-100 I2 --- Nep [0/23] Number of Ks epochs
102 A1 --- n_Name [a-c] Notes on individual stars (1)
--------------------------------------------------------------------------------
Note (1): Notes as follows:
a = Stars showing significant blending but with useful light curves
(see Figs 2-4)
b = Stars without Ks VMC data (see Fig. 2)
c = Stars showing significant blending and having unusable light curves
(see Figs 2 and 5)
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 17 A17 --- Name OGLE identification
(OGLE-LMC-ACEP-NNN or LMC571.05.5070)
19- 20 A2 --- Mode F (fundamental) or FO (1st overtone) mode
22- 30 F9.7 d Per Period
31- 36 F6.3 mag <Kmag> Intensity-averaged Ks magnitude
38- 42 F5.3 mag e_<Kmag> rms uncertainty on <Ksmag>
44- 47 F4.2 mag Kamp Peak-to-peak amplitude in Ks
49- 52 F4.2 mag E(V-I) Adopted reddening
54- 59 F6.3 mag dmag Correction in magnitude Δ due to the
deprojection for the inclination of the LMC
--------------------------------------------------------------------------------
Byte-by-byte Description of file: lc/*
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
4- 14 F11.5 d HJD Heliocentric Julian date (HJD-2400000)
19- 24 F6.3 mag Ksmag Ks magnitude
30- 34 F5.3 mag e_Ksmag rms uncertainty on Ksmag
--------------------------------------------------------------------------------
History:
From electronic version of the journal
References:
Cioni et al. Paper I 2011A&A...527A.116C 2011A&A...527A.116C
Miszalski et al. Paper II 2011A&A...531A.157M 2011A&A...531A.157M Cat. J/A+A/531/A157
Gullieuszik et al. Paper III 2012A&A...537A.105G 2012A&A...537A.105G Cat. J/A+A/537/A105
Rubele et al. Paper IV 2012A&A...537A.106R 2012A&A...537A.106R
Ripepi et al. Paper V 2012MNRAS.424.1807R 2012MNRAS.424.1807R Cat. J/MNRAS/424/1807
Cioni et al. Paper VI 2013A&A...549A..29C 2013A&A...549A..29C Cat. J/A+A/549/A29
Tatton et al. Paper VII 2013A&A...554A..33T 2013A&A...554A..33T Cat. J/A+A/554/A33
Moretti et al. Paper X 2014MNRAS.437.2702M 2014MNRAS.437.2702M Cat. J/MNRAS/437/2702
Cioni et al. Paper IX 2014A&A...562A..32C 2014A&A...562A..32C
Li et al. Paper XI 2014ApJ...790...35L 2014ApJ...790...35L
Piatti Et al. Paper XII 2014A&A...570A..74P 2014A&A...570A..74P
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Niederhofer et al. Paper XXX 2018A&A...613L...8N 2018A&A...613L...8N
Rubele et al. Paper XXXI 2018MNRAS.478.5017R 2018MNRAS.478.5017R
Zivkov et al. Paper XXXII 2018A&A...620A.143Z 2018A&A...620A.143Z
Groenewegen et al. Paper XXXIII 2019A&A...622A..63G 2019A&A...622A..63G
(End) Patricia Vannier [CDS] 26-Nov-2014