Assessment of evolutionary status of eclipsing binaries using light-curve parameters and spectral classification

Abstract

We have developed a procedure for the classification of eclipsing binaries from their light-curve parameters and spectral type. The procedure was tested on more than 1000 systems with known classification, and its efficiency was estimated for every evolutionary status we use. The procedure was applied to about 4700 binaries with no classification, and the vast majority of them was classified successfully. Systems of relatively rare evolutionary classes were detected in that process, as well as systems with unusual and/or contradictory parameters. Also, for 50 previously unclassified cluster binaries evolutionary classes were identified. These stars can serve as tracers for age and distance estimation of their parent stellar systems. The procedure proved itself as fast, flexible and effective enough to be applied to large ground based and space born surveys, containing tens of thousands of eclipsing binaries.

Hidden Population of Algols

“…The latter ones were drawn from the Catalogue of Eclipsing Variables, CEV, compiled by Malkov et al (2006) mainly from the General Catalogue of Variable Stars, GCVS (Samus et al 2013), upgraded by Avvakumova et al (2013), and uploaded into the Binary stars database, BDB (Kaygorodov et al 2012;Kovaleva et al 2015). The results of our simulations were tested against a CEV-based sample of 415 Algols with original classification and 1726 systems classified as Algols using the procedure suggested by and substantially modified by Avvakumova & Malkov (2014), altogether 2141 systems. Figure 2 illustrates the brightness (magnitude at maximum) distribution of catalogued Algols.…”

Statistical analysis of Algol‐type eclipsing binaries with stable mass transfer

“…However, in our results, the suspected SA systems are distributed similar to the confirmed SA systems and they are not the case for the SH systems. We conclude that the classification procedure developed by Avvakumova & Malkov () did not work properly for the SH systems. So we excluded suspected SH systems from our further consideration of results, which were shown in Figures .…”

“…As we discussed the orbital and stellar parameters of Algol‐type eclipsing systems for both confirmed and suspected systems in sections 2.1.1–2.1.3, we plot the semimajor axis and mass ratio distribution of both confirmed SA/SH and suspected SA from CEV and Svechnikov & Kuznetsova (), which are shown in Figures and . Hence, we compare our results with the statistical analysis of Malkov et al () and Avvakumova & Malkov (). The semimajor axes that we have calculated from the CEV using Equation and directly from the catalog of Svechnikov & Kuznetsova () are almost the same, while the mass ratios of these systems are q < 0:8, which implies that the mass transfer in these systems is stable.…”

“…The largest list of eclipsing binaries with available classification, CEV, was compiled by Malkov et al () and Malkov et al () mainly from the General Catalog of Variable Stars (GCVS; Samus et al ) and upgraded by Avvakumova et al () and Malkov & Avvakumova (). Some CEV systems have classifiers taken from the literature (hereafter confirmed systems), and some others were classified by Avvakumova & Malkov (), who developed a procedure for the classification of eclipsing binaries from their light curve parameters and spectral type, tested it, and applied it to initially nonclassified CEV systems (hereafter suspected systems).…”

Magnetic OB[A] Stars with TESS: probing their Evolutionary and Rotational properties (MOBSTER) – I. First-light observations of known magnetic B and A stars

“…Based on radial velocity measurements, find a possible periodicity of ∼9 d that could be associated to binarity. Avvakumova & Malkov (2014) evaluate this system to be a detached main sequence binary, based on its well-established membership in the NGC 2615 cluster (e.g. Landstreet et al 2007).…”