Identification of field dwarfs and giants in the second Radial Velocity Experiment Data Release

dc.contributor.authorBilir, S.
dc.contributor.authorKaraali, S.
dc.contributor.authorAk, S.
dc.contributor.authorOnal, O.
dc.contributor.authorCoskunoglu, B.
dc.contributor.authorSeabroke, G. M.
dc.departmentİstanbul Beykent Üniversitesien_US
dc.description.abstractThe second Radial Velocity Experiment (RAVE) Data Release (DR2) derives log g values. However, we present a simpler and cleaner method of identifying dwarfs and giants by using only magnitudes, which does not require spectroscopic analysis. We confirm the method presented in an earlier paper, with which we estimate the number of dwarfs and giants using their positions in the JV two-magnitude diagram, by applying it to RAVE DR2. It is effective in estimating the number of dwarfs and giants at JH > 0.4 compared to RAVEs log g values. For JH= 0.4, where dwarfs and subgiants show a continuous transition in the J magnitude histogram, we used the Besancon Galaxy model predictions to statistically isolate giants. The percentages of giants for red stars and for the whole sample are 85 and 34 per cent, respectively. If we add the subgiants, the percentage of evolved stars for the whole sample increases to 59 per cent. For the first time in the literature, we have analysed the effect of CHISQ on RAVEs log g values (CHISQ is the penalized 2 from RAVEs technique of finding an optimal match between the observed spectrum and synthetic spectra to derive stellar parameters). Neither the CHISQ values nor the signal-to-noise ratio bias the RAVE log g values. Therefore, the method of identifying dwarfs and giants using the two-magnitude diagram has been verified against an unbiased data set.en_US
dc.description.sponsorshipAustralian Astronomical Observatory; Astrophysical Institute Potsdam; Australian National University; Australian Research Council; French National Research Agency; German Research Foundation; Instituto Nazionale di Astrofisica at Padova; Johns Hopkins University; W. M. Keck Foundation; Macquarie University; Netherlands Research School for Astronomy; Natural Sciences and Engineering Research Council of Canada; Slovenian Research Agency; Swiss National Science Foundation; Science and Technology Facilities Council of the United Kingdom; Opticon; Strasbourg Observatory; University of Groningen; University of Heidelberg; University of Sydney; Beykent University; National Aeronautics and Space Administration; National Science Foundation; UK Space Agency [ST/I000852/1] Funding Source: researchfishen_US
dc.description.sponsorshipFunding for RAVE has been provided by the Australian Astronomical Observatory, the Astrophysical Institute Potsdam, the Australian National University, the Australian Research Council, the French National Research Agency, the German Research Foundation, the Instituto Nazionale di Astrofisica at Padova, Johns Hopkins University, the W. M. Keck Foundation, the Macquarie University, the Netherlands Research School for Astronomy, the Natural Sciences and Engineering Research Council of Canada, the Slovenian Research Agency, the Swiss National Science Foundation, the Science and Technology Facilities Council of the United Kingdom, Opticon, Strasbourg Observatory and the Universities of Groningen, Heidelberg and Sydney.; SK is grateful to the Beykent University for financial support. This publication makes use of data products from the 2MASA, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by the National Aeronautics and Space Administration and the National Science Foundation.en_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.relation.ispartofMonthly Notices Of The Royal Astronomical Societyen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.subjecttechniques: photometricen_US
dc.titleIdentification of field dwarfs and giants in the second Radial Velocity Experiment Data Releaseen_US