J/MNRAS/447/3536 Variables in the fields of M35 and NGC2158 (Nardiello+, 2015)
Variable stars in two open clusters within the Kepler/K2-Campaign-0 field:
M35 and NGC 2158.
Nardiello D., Bedin L.R., Nascimbeni V., Libralato M., Cunial A.,
Piotto G., Bellini A., Borsato L., Brogaard K., Granata V., Malavolta L.,
Marino A.F., Milone A.P., Ochner P., Ortolani S., Tomasella L., Clemens M.,
Salaris M.
<Mon. Not. R. Astron. Soc., 447, 3536-3547 (2015)>
=2015MNRAS.447.3536N 2015MNRAS.447.3536N
ADC_Keywords: Clusters, open ; Stars, variable ; Photometry, UBVRI
Keywords: techniques: photometric - binaries: general - stars: distances -
stars: variables: general -
open clusters and associations: individual: M35
Abstract:
We present a multiyear survey aimed at collecting (1) high-precision
(∼5 milli-mag), (2) fast-cadence (∼3-min), and (3) relatively long
duration (∼10d) multiband photometric series. The goal of the
survey is to discover and characterize efficiently variable objects
and exoplanetary transits in four fields containing five nearby open
clusters spanning a broad range of ages. More in detail, our project
will (1) constitute a preparatory survey for the High Accuracy Radial
velocity Planet Searcher for the Northern hemisphere (HARPS-N) mounted
at the Telescopio Nazionale Galileo (TNG), which will be used for
spectroscopic follow-up of any target of interest that this survey
discovers or characterizes, (2) measure rotational periods and
estimate the activity level of targets we are already monitoring with
HARPS and HARPS-N for exoplanet transit search, and (3) long-term
characterization of selected targets of interest in open clusters
within the planned K2 fields. In this first paper, we give an
overview of the project, and report on the variability of objects
within the first of our selected fields, which contains two open
clusters: M35 and NGC 2158. We detect 519 variable objects, 273 of
which are new discoveries, while the periods of most of the previously
known variables are considerably improved.
Description:
All data used in this work come from the Asiago 67/92 cm Schmidt
Telescope, located at 1370m on Mt Ekar (longitude 11.5710°E,
latitude 45.8430°N); this facility belongs to the Astronomical
Observatory of Padova (OAPD - Osservatorio Astronomico di Padova),
which is part of the Istituto Nazionale di Astrofisica (INAF).
Under the long-term observing programme 'The Asiago Pathfinder for
HARPS-N' (PI: Bedin), four fields were awarded with 80 nights per
year, during three observing campaigns.
A catalogue for variable stars in M 35 and NGC 2158 field, their light
curves and an astro-photometric catalogue of all the sources detected
in the field are presented.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
variable.dat 197 519 Catalogue of variable stars
m35n2158.dat 93 66486 M35 and NGC2158 field astro-photometric catalog
lc/* . 1919 *Individual B, V, R and "white light" (N)
light curves
charts/* . 2011 *Astrometrized BVRN finding charts (fits files)
stack/* . 4 *Astrometrized BVRN stacks (fits files)
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Note on lc/* : Files named lc.A.NNN, i.e.
lc.B.001, lc.V.001, lc.R.001 and lc.N.001 for star 001.
Note on charts/* : Files named VAR.NNN.A.fits, i.e.
VAR.001.B.fits, VAR.001.V.fits, VAR.001.R.fits and VAR.001.N.fits for star 1.
Note on stack/* : Files named M35NGC2158B.fits, M35NGC2158V.fits,
M35NGC2158R.fits and M35NGC2158N.fits.
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See also:
J/A+A/564/A79 : Proper motions of open clusters from UCAC4 (Dias+, 2014)
Byte-by-byte Description of file: variable.dat
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Bytes Format Units Label Explanations
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3- 5 I03 --- ID [1/519] ID number of the star
8- 17 F10.6 deg RAdeg Right ascension (J2000)
20- 29 F10.6 deg DEdeg Declination (J2000)
32- 44 F13.9 d Per [0.03/276] Period of variability
48- 54 F7.4 mag Bmag ?=0.0 Calibrated B magnitude
58- 64 F7.4 mag Vmag ?=0.0 Calibrated V magnitude
68- 74 F7.4 mag Rmag ?=0.0 Calibrated R magnitude
78- 85 F8.4 mag Nmag [-18/-7]?=0.0 Instrumental "white light" magnitude
89- 94 F6.3 mag Jmag ?=0.0 J magnitude in 2MASS system
99-104 F6.3 mag Hmag ?=0.0 H magnitude in 2MASS system
109-114 F6.3 mag Kmag ?=0.0 Ks magnitude in 2MASS system
119-129 A11 --- Type Type of variability (2)
131-137 F7.3 % MP35 ?=-99.999 Membership Probability for M35 (1)
141-147 F7.3 % MP2158 ?=-99.999 Membership Probability for NGC2158 (1)
159-160 A2 --- Kim04 Variable ID in Kim et al. (2004IBVS.5558....1K 2004IBVS.5558....1K)
165-167 A3 --- Hu05 Variable ID in Hu et al. (2005ChJAA...5..356H 2005ChJAA...5..356H)
<Cl* NGC 2168 HIZ VNN> in Simbad
172-174 A3 --- Moc06 Variable ID in Mochejska+ (2006AJ....131.1090M 2006AJ....131.1090M)
<Cl* NGC 2158 MSS VNN> in Simbad
177-179 I3 --- Mei09 ? Variable ID in Meibom+ 2009 (J/ApJ/695/679)
<Cl* NGC 2168 MMS NNN> in Simbad
186-188 A3 --- JL10 Variable ID in Jeon & Lee (2010PKAS...25..167J 2010PKAS...25..167J)
190-197 A8 --- GCVS Variable ID in the GCVS (Cat. B/gcvs )
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Note (1): Membership probabilities from Dias et al.
(2014A&A...564A..79D 2014A&A...564A..79D, Cat. J/A+A/564/A79)
Note (2): Variability tyes are one of:
Rot (Rotational variable), EB (eclipsing binary), RRLy (RR Lyrae),
deltaCep (δ Cep), deltaSct (δ Sct), Long-Period, or Unknown.
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Byte-by-byte Description of file: m35n2158.dat
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Bytes Format Units Label Explanations
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3- 10 F8.5 deg RAdeg Right ascension (J2000)
14- 22 F9.6 deg DEdeg Declination (J2000)
26- 32 F7.4 mag Bmag ?=0.0 Calibrated B magnitude
36- 42 F7.4 mag Vmag ?=0.0 Calibrated V magnitude
46- 52 F7.4 mag Rmag ?=0.0 Calibrated R magnitude
56- 61 F6.3 mag Jmag ?=0.0 J magnitude in 2MASS system
66- 71 F6.3 mag Hmag ?=0.0 H magnitude in 2MASS system
76- 81 F6.3 mag Kmag ?=0.0 Ks magnitude in 2MASS system
86- 93 F8.4 mag Nmag [-20/0]?=0 Instrumental "white light" magnitude
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Byte-by-byte Description of file (#) : lc/*
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Bytes Format Units Label Explanations
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5- 20 F16.8 d BJD Barycentric Julian Date
25- 32 F8.4 mag mag Magnitude
38- 44 F7.4 mag e_mag rms uncertainty on mag
51- 56 F6.4 --- Phase Phase
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Acknowledgements:
Domenico Nardiello, domenico.nardiello(at)studenti.unipd.it
(End) Patricia Vannier [CDS] 04-Sep-2015