Discovery of blue companions to two southern Cepheids: WW Car and FN Vel
| العنوان: | Discovery of blue companions to two southern Cepheids: WW Car and FN Vel |
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| المؤلفون: | László Szabados, V. V. Kovtyukh, B. Lemasle, F. A. Chekhonadskikh, S. I. Belik |
| المساهمون: | Low Energy Astrophysics (API, FNWI) |
| المصدر: | Monthly Notices of the Royal Astronomical Society, 448(4), 3567-3571. Oxford University Press |
| بيانات النشر: | Oxford University Press (OUP), 2015. |
| سنة النشر: | 2015 |
| مصطلحات موضوعية: | Physics, Cepheid variable, FOS: Physical sciences, Astronomy, Balmer series, Astronomy and Astrophysics, Astrophysics, Astrophysics - Astrophysics of Galaxies, K-line, Spectral line, symbols.namesake, Stars, Astrophysics - Solar and Stellar Astrophysics, Space and Planetary Science, Astrophysics of Galaxies (astro-ph.GA), symbols, Solar and Stellar Astrophysics (astro-ph.SR), Line (formation) |
| الوصف: | A large number of high-dispersion spectra of classical Cepheids were obtained in the region of the CaII H+K spectral lines. The analysis of these spectra allowed us to detect the presence of a strong Balmer line, H$\epsilon$, for several Cepheids, interpreted as the signature of a blue companion: the presence of a sufficiently bright blue companion to the Cepheid results in a discernible strengthening of the CaII H + Hepsilon line relative to the CaII K line. We investigated 103 Cepheids, including those with known hot companions (B5-B6 main-sequence stars) in order to test the method. We could confirm the presence of a companion to WW Car and FN Vel (the existence of the former was only suspected before) and we found that these companions are blue hot stars. The method remains efficient when the orbital velocity changes in a binary system cannot be revealed and other methods of binarity detection are not efficient. Comment: 6 pages, 5 figures, 4 tables, published on MNRAS in March 2015 |
| وصف الملف: | application/pdf |
| تدمد: | 1365-2966 0035-8711 |
| DOI: | 10.1093/mnras/stv258 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::22503d6c12fcca29a3203eb3078e3ef1 https://doi.org/10.1093/mnras/stv258 |
| Rights: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....22503d6c12fcca29a3203eb3078e3ef1 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 13652966 00358711 |
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| DOI: | 10.1093/mnras/stv258 |