https://pfspipe.ipmu.jp/jira This file is an XML representation of an issue en-us 8.3.4 803005 13-09-2019 https://pfspipe.ipmu.jp/jira/browse/PIPE2D-383 DRP 2-D Pipeline <p>'What stars can we use for flux calibration?  Can we use F2V?  F9V?  K2V?' - this is not a trivial question and we need to carefully define a metric of good/bad.  This needs thinking, but for now, we just need a crude selection and perhaps we can define color cuts to select F1V-F9V stars?  Please leave comments if you have any thoughts on this.  We will revisit this issue in the future with a separate ticket (Tanaka is thinking that we can employ an probabilistic approach: e.g., if you have F3V, use it, but if not, accept K1V).</p> PIPE2D-383

Define crude criteria to select F-stars from HSC photometry

Task Normal Done Done Takuji Yamashita Masayuki Tanaka flux-calibration Thu, 7 Mar 2019 06:42:03 +0000 Wed, 18 Sep 2019 12:43:28 +0000 Tue, 17 Sep 2019 02:40:14 +0000 0 2 <p>The AMBRE templates have two models, plane-parallel (p) and spherical (s) geometries. In the p-model, we have four parameters: effective temperature (Teff) and log-gravity (logg), stellar metallicity (<span class="error">&#91;Fe/H&#93;</span>), and alpha elements (<span class="error">&#91;alpha/Fe&#93;</span>).<br/>  <br/> In the gri diagrams (HSCColorsSelection_W02_p_*png), the synthetic HSC colors of the p-models with Teff=6000 - 7300 K (equivalent to F-stars) are plotted.  The black dots are HSC stellar objects fetched from <a href="https://pfspipe.ipmu.jp/jira/browse/PIPE2D-382" class="external-link" rel="nofollow">PIPE2D-382</a>.  The "crude" color criteria to select F stars is defined by the green box, which is drawn by hand. The selection criteria enclose almost all the models. <br/>  <br/> The selection lines pass through (g-r, r-i) = (0.06, -0.11), (0.41, 0.07), (0.02, -0.06), and (0.30, 0.13). Thus, the criteria are described as<br/> r-i &gt; 0.514 * g-r - 0.141<br/> r-i &lt; 0.679 * g-r - 0.074<br/> r-i &gt; -1.25 * g-r - 0.0350<br/> r-i &lt; -0.545 * g-r + 0.294<br/>  <br/> The parameter dependences of synthetic HSC colors are shown in color-color diagrams. The sequence of red-blue is formed by Teff, primarily. This sequence is magnified by log g at a fix Teff. The dispersion in a perpendicular direction to the red-blue sequence is made by stellar metallicity. <span class="error">&#91;alpha/Fe&#93;</span> has a small effect on the colors.<br/>  <br/> In the s-model case (HSCColorsSelection_W02_s_Teff.png), the synthetic colors are shifted to bluer than the p-model. We need to consider how to handle these two models.<br/>  <br/>  </p> <p>The crude selection criteria is provided. This ticket is closed. The issue on the difference of the atmosphere models (parallel and sphere) will be studied in other tickets in the future.</p> Relates PIPE2D-361 Development Epic Link PIPE2D-303 Rank 0|02qpt6:508yl03zc04 Reviewers msyktnk Sprint 2DDRP-2019 C 2DDRP-2019 D 2DDRP-2019 E 2DDRP-2019 F 2DDRP-2019 G Story Points 1.0