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The more recent (<jats:italic>R <\/jats:italic>\u2013<jats:italic> I<\/jats:italic>)<jats:sub>\n                     <jats:italic>C<\/jats:italic>\n                  <\/jats:sub> color\u2013<jats:italic>T<\/jats:italic>\n                  <jats:sub>eff<\/jats:sub> correlation using the data of Mann et al. (hereafter M15) and Boyajian et al. (hereafter B12) shows that this color can be applied as a temperature estimate for large samples of stars. We find that the mean scatter in <jats:italic>T<\/jats:italic>\n                  <jats:sub>eff<\/jats:sub> relative to the (<jats:italic>R <\/jats:italic>\u2013 <jats:italic>I<\/jats:italic>)<jats:sub>\n                     <jats:italic>C<\/jats:italic>\n                  <\/jats:sub>\u2013<jats:italic>T<\/jats:italic>\n                  <jats:sub>eff<\/jats:sub> relationship of B12 and M15 data is only \u00b13<jats:italic>\u03c3<\/jats:italic>\u00a0=\u00a044.6\u00a0K for K dwarfs and \u00b13<jats:italic>\u03c3<\/jats:italic>\u00a0=\u00a039.4\u00a0K for M dwarfs. These figures are small and show that the (<jats:italic>R<\/jats:italic> \u2013 <jats:italic>I<\/jats:italic>)<jats:sub>\n                     <jats:italic>C<\/jats:italic>\n                  <\/jats:sub> color can be used as a first-guess effective temperature estimator for K and M dwarfs. We derive effective temperatures for about 1910 K and M dwarfs using the calibration of (<jats:italic>R <\/jats:italic>\u2013 <jats:italic>I<\/jats:italic>)<jats:sub>\n                     <jats:italic>C<\/jats:italic>\n                  <\/jats:sub> color\u2013<jats:italic>T<\/jats:italic>\n                  <jats:sub>eff<\/jats:sub> from B12 and M15 data. We also compiled <jats:italic>T<\/jats:italic>\n                  <jats:sub>eff<\/jats:sub> and metallicity measurements available in the literature using the VizieR database. We determine <jats:italic>T<\/jats:italic>\n                  <jats:sub>eff<\/jats:sub> for 441 stars with previously unknown effective temperatures. We also identified 21 new spectroscopic binaries and one triple system from our high-resolution spectra.<\/jats:p>","DOI":"10.3847\/1538-3881\/ab23fe","type":"journal-article","created":{"date-parts":[[2019,7,10]],"date-time":"2019-07-10T14:13:30Z","timestamp":1562768010000},"page":"56","update-policy":"https:\/\/doi.org\/10.1088\/crossmark-policy","source":"Crossref","is-referenced-by-count":33,"title":["The Mass\u2013Activity Relationships in M and K Dwarfs. I. Stellar Parameters of Our Sample of M and K Dwarfs*"],"prefix":"10.3847","volume":"158","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0403-7519","authenticated-orcid":false,"given":"\u00c9ric R.","family":"Houdebine","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7087-9167","authenticated-orcid":false,"given":"D. J.","family":"Mullan","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"J. 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