J/ApJS/224/21 The VMC survey. XIX. Classical Cepheids in SMC (Ripepi+, 2016)
The VMC survey.
XIX. Classical Cepheids in the Small Magellanic Cloud.
Ripepi V., Marconi M., Moretti M.I., Clementini G., Cioni M.-R.,
de Grijs R., Emerson J.P., Groenewegen M.A.T., Ivanov V.D., Piatti A.E.
<Astrophys. J. Suppl. Ser., 224, 21-21 (2016)>
=2016ApJS..224...21R 2016ApJS..224...21R (SIMBAD/NED BibCode)
ADC_Keywords: Stars, variable ; Magellanic Clouds ; Photometry, infrared ;
Surveys
Keywords: distance scale; Magellanic Clouds; stars: oscillations;
stars: variables: Cepheids
Abstract:
The "VISTA near-infrared YJKs survey of the Magellanic Clouds
System" (VMC) is collecting deep Ks-band time-series photometry of
pulsating variable stars hosted by the two Magellanic Clouds and their
connecting Bridge. In this paper, we present Y, J, Ks light curves
for a sample of 4172 Small Magellanic Cloud (SMC) Classical Cepheids
(CCs). These data, complemented with literature V values, allowed us
to construct a variety of period-luminosity (PL),
period-luminosity-color (PLC), and period-Wesenheit (PW)
relationships, which are valid for Fundamental (F), First Overtone
(FO), and Second Overtone (SO) pulsators. The relations involving the
V, J, Ks bands are in agreement with their counterparts in the
literature. As for the Y band, to our knowledge, we present the first
CC PL, PW, and PLC relations ever derived using this filter. We also
present the first near-infrared PL, PW, and PLC relations for SO
pulsators to date. We used PW(V, Ks) to estimate the relative
SMC-LMC distance and, in turn, the absolute distance to the SMC. For
the former quantity, we find a value of Δµ=0.55±0.04mag,
which is in rather good agreement with other evaluations based on CCs,
but significantly larger than the results obtained from older
population II distance indicators. This discrepancy might be due to
the different geometric distributions of young and old tracers in both
Clouds. As for the absolute distance to the SMC, our best estimates
are µSMC=19.01±0.05mag and µSMC=19.04±0.06mag, based on
two distance measurements to the LMC which rely on accurate CC and
eclipsing Cepheid binary data, respectively.
Description:
In this paper, we present results for the Classical Cepheids (CCs)
included in 11 tiles (each tile is 1.5deg2 on the sky) completely or
nearly completely observed, processed, and cataloged by the "VISTA
near-infrared YJKs survey of the Magellanic Clouds System" (VMC)
survey as of 2015 March 9 (including observations obtained until 2014
September). See Figure 1.
VMC is a European Southern Observatory (ESO) public survey that is
carried out with VIRCAM (VISTA InfraRed Camera) on the ESO/VISTA
telescope. The scope of this paper is to present the results for the
CCs in the SMC after four years of VMC observations. The SMC is known
to host more than 4500 CCs, according to the OGLE III (Soszynski et
al. 2010, J/AcA/60/17) and EROS 2 (Tisserand et al.
2007A&A...469..387T 2007A&A...469..387T; Kim et al. 2014, J/A+A/566/A43) surveys.
File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table3.dat 49 120322 Y, J and Ks time series photometry for the
Classical Cepheid variables investigated
in this paper
table5.dat 151 4172 Results of the template-fitting procedure
--------------------------------------------------------------------------------
See also:
J/ApJ/816/49 : Spitzer/IRAC observations of SMC Cepheids (Scowcroft+, 2016)
J/MNRAS/449/639 : VMC survey. XIV. SFR in SMC (Rubele+, 2015)
J/AJ/149/117 : LMC IR survey. I. Photometry of Cepheids (Macri+, 2015)
J/A+A/576/A30 : NIR LC templates for classical Cepheids (Inno+, 2015)
J/MNRAS/446/3034 : LMC Type II Cepheids J and Ks light curves (Ripepi+, 2015)
J/MNRAS/442/1663 : Velocities of red giants in the SMC (Dobbie+, 2014)
J/A+A/566/A43 : EPOCH Project. EROS-2 LMC periodic variables (Kim+, 2014)
J/MNRAS/437/2702 : MC Cepheids, RR Lyrae stars and binaries (Moretti+, 2014)
J/MNRAS/437/2307 : LMC anomalous Cepheid Ks light curves (Ripepi+, 2014)
J/MNRAS/424/1807 : VISTA Magellanic Cloud Survey. V. Cepheids (Ripepi+, 2012)
J/MNRAS/420/585 : AKARI observations of SMC Cepheids (Ngeow+, 2012)
J/ApJ/730/119 : HST/WFC3 obs. of Cepheids in SN Ia hosts (Riess+, 2011
J/ApJ/715/277 : Insights into the Cepheid distance scale (Bono+, 2010)
J/ApJ/713/615 : Very metal-poor Cepheid models (Marconi+, 2010)
J/AcA/60/17 : VI light curves of SMC classical Cepheids (Soszynski+, 2010)
J/AJ/136/1703 : Ridgelines of 6 intermediate-age SMC clusters (Glatt+, 2008)
J/ApJ/658/345 : CRIc photometry of Magellanic Bridge Fields (Harris, 2007)
J/AJ/123/855 : Magellanic Clouds Photometric Survey: SMC (Zaritsky+, 2002)
J/AJ/127/1531 : Star formation history of SMC (Harris+, 2004)
J/AcA/49/437 : BVI photometry of OGLE SMC Cepheids (Udalski+, 1999)
Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 17 A17 --- Name Classical Cepheid identifier
19- 20 A2 --- Band VISTA/WIRCam observed passband (Y, J or Ks)
22- 32 F11.5 d JD Heliocentric Julian Date; JD-2400000 (1)
34- 42 F9.3 mag mag [9.8/19.5] Observed magnitude in Band
44- 49 F6.3 mag e_mag [0/0.2] The 1σ uncertainty in mag
--------------------------------------------------------------------------------
Note (1): According the suggestion from the author, 10 bad observations
(with JD=0) have been removed (those phase points were not present in
the figures); note added by CDS.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table5.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 17 A17 --- Name OGLE III (OGLE SMC-CEP-NNNN) or
EROS2 (smNNNNa.NNNNN) identifier
19- 21 A3 --- Tile Source VMC tile
23- 31 F9.6 deg RAdeg [5.47/21.8] Right Ascension (J2000)
33- 42 F10.6 deg DEdeg [-74.8/-71.2] Declination (J2000)
44- 51 A8 --- Type Cepheid pulsation mode type (1)
53- 62 F10.6 d Per [0.2/209] Period
64- 65 I2 --- o_Ymag [1/18] Number of Ymag epochs
67- 72 F6.3 mag Ymag [11/19.1] Intensity-averaged VISTA
Y band magnitude
74- 78 F5.3 mag e_Ymag [0.001/0.3] Uncertainty in Ymag
80- 83 F4.2 mag Yamp [0.01/1.3] Peak-to-Peak amplitude in Y band
85- 88 F4.2 mag e_Yamp [0/0.4] Uncertainty in Yamp
90- 91 I2 --- o_Jmag [1/20] Number of Jmag epochs
93- 98 F6.3 mag Jmag [10.9/19.4] Intensity-averaged VISTA J band
magnitude
100-104 F5.3 mag e_Jmag [0.001/0.2] Uncertainty in Jmag
106-109 F4.2 mag Jamp [0/0.9] Peak-to-Peak amplitude in J band
111-114 F4.2 mag e_Jamp [0/0.3] Uncertainty in Jamp
116-117 I2 --- o_Ksmag [1/60] Number of Ksmag epochs
119-124 F6.3 mag Ksmag [10.2/18.7]?=99.999 Intensity-averaged VISTA
Ks band magnitude
126-130 F5.3 mag e_Ksmag [0.001/0.08]?=9.999 Uncertainty in Ksmag
132-136 F5.3 mag Ksamp [0/0.9]?=9.999 Peak-to-Peak amplitude
in Ks band
138-142 F5.3 mag e_Ksamp [0/0.2]?=9.999 Uncertainty in Ksamp
144-151 A8 --- Flag [,0-5] Source flag(s) (2)
--------------------------------------------------------------------------------
Note (1): Mode as follows:
F = Fundamental;
FO = First Overtone;
SO = Second overtone;
TO = Third Overtone.
Note (2): Flag assigned using the PW(V,Ks) as reference relation. The first
part of the table includes all stars with flag = 0 ordered by
increasing period. The second part includes all stars with flag>0,
sorted by increasing period. Flag as follows:
0 = no remark;
1 = overluminous star with separation between VMC and OGLE III position
larger than 0.2 arcsec;
2 = largely scattered or under-sampled light curve;
3 = Remarks OGLE III;
4 = Remarks VMC;
5 = Saturation;
10 = F-mode outliers without evident explanation;
11 = FO-mode outliers without evident explanation;
12 = V band lacking.
--------------------------------------------------------------------------------
Acknowledgements:
Vincenzo Ripepi [INAF]
History:
From electronic version of the journal
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(End) Prepared by [AAS], Emmanuelle Perret [CDS] 11-Jul-2016