A catalogue of close binaries located in the δ Scuti region of the Cepheid instability strip |
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| Authors: | E Soydugan F Soydugan O Demircan C &#;banolu |
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| Institution: | Dipartimento di Astronomia, Universitàdi Padova, vicolo dell'Osservatorio 2, I-35122 Padova, Italy;INAF, Osservatorio Astronomico di Bologna, via Ranzani 1, I-40127 Bologna, Italy;Dipartimento di Astronomia, Universitàdi Bologna, via Ranzani 1, I-40127 Bologna, Italy;Dipartimento di Fisica, Universitàdi Roma Tor Vergata, via della Ricerca Scientifica 1, I-00133 Roma, Italy;Harvard-Smithsonian Centre for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA;Dipartimento di Astronomia, Universitàdi Trieste, via Tiepolo 11, I-34131 Trieste, Italy;INFN –National Institute for Nuclear Physics, Trieste, Italy;INAF –Osservatorio Astronomico di Trieste, via Tiepolo 11, I-34131 Trieste, Italy;Max-Planck-Institut für Astrophysik, Karl-Schwarzschild Strasse 1, D-85748 Garching bei München, Germany;Institute of Theoretical Physics, Chinese Accademy of Sciences, Beijing 100080, China;Dipartimento di Fisica Generale 'Amedeo Avogadro', Universitàdi Torino, via Giuria 1, I-10125 Torino, Italy |
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| Abstract: | A catalogue of close eclipsing binary systems (detached and semidetached) with at least one of the components located in the δ Scuti region of the Cepheid instability strip is presented. The positions of the stars in the instability strip are determined by their accurate temperatures and luminosities. Observationally detected binaries (20 semidetached, four detached and one unclassified) with oscillating components were included in the catalogue as a separate table. The primaries of the oscillating Algols tend to be located near the blue edge of the instability strip. Using reliable luminosities and temperatures determined by recent photometric and spectroscopic studies, we have found that at least one or two components of 71 detached and 90 semidetached systems are located in the δ Scuti region of the Cepheid instability strip. In addition, 36 detached or semidetached systems discovered by the Hipparcos satellite were also given as a separate list. One of their components is seen in the δ Scuti region, according to their spectral type or B ? V colours. They are potential candidate binaries with the δ Scuti-type pulsating components which need further photometric and spectroscopic studies in better precision. This catalogue covers information and literature references for 25 known and 197 candidate binaries with pulsating components. |
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| Keywords: | hydrodynamics methods: numerical galaxies: clusters: general cosmology: miscellaneous X-rays: galaxies |
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