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Fundamental effective temperature measurements for eclipsing binary stars – IV. Selection of new benchmark stars and first results for HD 22064

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Fundamental effective temperature measurements for eclipsing binary stars – IV. Selection of new benchmark stars and first results for HD 22064 Thumbnail


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Abstract

I describe the selection and initial characterization of 20 eclipsing binary stars that are suitable for calibration and testing of stellar models and data analysis algorithms used by the PLATO mission and spectroscopic surveys. The binary stars selected are F-/Gtype dwarf stars with M-type dwarf companions that contribute less than 2 per cent of the flux at optical wavelengths. The light curves typically show well-defined total eclipses with very little variability between the eclipses. I have used near-infrared spectra obtained by the APOGEE survey to measure the spectroscopic orbit for both stars in HD 22064. Combined with an analysis of the TESS light curve, I derive the following masses and radii: M-1 = 1.35 +/- 0.03M(circle dot), M-2 = 0.58 +/- 0.01M(circle dot), R-1 = 1.554 +/- 0.014R(circle dot), R-2 = 0.595 +/- 0.008R(circle dot). Using R 1 and the parallax from Gaia EDR3, I find that the primary star's angular diameter is.= 0.1035 +/- 0.0009 mas. The apparent bolometric flux of the primary star is F-circle plus , (0) = (7.51 +/- 0.09) x10(-9) erg cm(-2) s(-1). Hence, this F2V star has an effective temperature T (eff,1) = 6763 K +/- 39 K. HD 22064 is an ideal benchmark star that can be used for `end-to-end' tests of the stellar parameters measured by large-scale spectroscopic surveys or stellar parameters derived from asteroseismology with PLATO. The techniques described here for HD 22064 can be applied to the other eclipsing binaries in the sample in order to create an all-sky network of such benchmark stars.

Acceptance Date Apr 6, 2023
Publication Date Jun 1, 2023
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Oxford University Press
Volume 522
Issue 2
Pages 2683 - 2695
DOI https://doi.org/10.1093/mnras/stad1112
Keywords techniques: spectroscopic, binaries: eclipsing, stars: fundamental parameters, stars: individual: HD 22064, stars: solar-type
Publisher URL https://academic.oup.com/mnras/article/522/2/2683/7129021

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