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|Title:||The atmosphere, the p-factor and the bright visible circumstellar environment of the prototype of classical Cepheids δ Cep||Authors:||Nardetto, Nicolas
Anderson, Richard I.
|Issue Date:||2017||Journal:||EPJ WEB OF CONFERENCES||Volume:||Wide-Field Variability Surveys: A 21st Century Perspective – 22nd Los Alamos Stellar Pulsation||Editors:||Catelan, M.; Gieren, W.||Number:||152||First Page:||07003||Abstract:||Even ≃ 16000 cycles after its discovery by John Goodricke in 1783, δ Cep, the prototype of classical Cepheids, is still studied intensively in order to better understand its atmospheric dynamical structure and its environment. Using HARPS-N spectroscopic measurements, we have measured the atmospheric velocity gradient of δ Cep for the first time and we confirm the decomposition of the projection factor, a subtle physical quantity limiting the Baade-Wesselink (BW) method of distance determination. This decomposition clarifies the physics behind the projection factor and will be useful to interpret the hundreds of p-factors that will come out from the next Gaia release. Besides, VEGA/CHARA interferometric observations of the star revealed a bright visible circumstellar environment contributing to about 7% to the total flux. Better understanding the physics of the pulsation and the environment of Cepheids is necessary to improve the BW method of distance determination, a robust tool to reach Cepheids in the MilkyWay, and beyond, in the Local Group.||Conference Name:||Wide-Field Variability Surveys: A 21st Century Perspective – 22nd Los Alamos Stellar Pulsation – Conference Series Meeting||Conference Place:||San Pedro de Atacama, Chile||Conference Date:||November 28 – December 2, 2016||URI:||http://hdl.handle.net/20.500.12386/26768||URL:||https://www.epj-conferences.org/articles/epjconf/abs/2017/21/epjconf_puls2017_07003/epjconf_puls2017_07003.html||ISSN:||2101-6275||ISBN:||978-2-7598-9024-8||DOI:||10.1051/epjconf/201715207003||Bibcode ADS:||2017EPJWC.15207003N||Fulltext:||open|
|Appears in Collections:||3.01 Contributi in Atti di convegno|
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