Variable stars in two open clusters within the Kepler/K2-Campaign-0 field: M35 and NGC 2158

Journal
Date Issued
2015
Author(s)
Nardiello, D.
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Libralato, M.
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Cunial, A.
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Piotto, G.
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Bellini, A.
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Brogaard, K.
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Granata, V.
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Milone, A. P.
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Ochner, P.
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Ortolani, S.
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Clemens, M.
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Salaris, M.
DOI
Description
DN, LRB, VN, ML, AC, GP, LB, VG, and LM acknowledge PRIN-INAF 2012 partial funding under the project entitled ‘The M4 Core Project with Hubble Space Telescope’. DN is supported by a grant ‘Borsa di studio per l'estero, bando 2013’ awarded by ‘Fondazione Ing. Aldo Gini’ in Padua (Italy). Some tasks of our data analysis have been carried out with the vartools (Hartman et al. 2008 ) and astrometry.net codes (Lang et al. 2010 ). This research made use of the International Variable Star Index (VSX) data base, operated at AAVSO, Cambridge, MA, USA.
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 (̃10 d) 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.
Volume
447
Issue
4
Start page
3536
Uri
Url
Issn Identifier
0035-8711
Ads BibCode
2015MNRAS.447.3536N
Rights
open.access
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