Please use this identifier to cite or link to this item:
http://hdl.handle.net/20.500.12386/28177
Title: | The p and k-factors of the Classical Cepheid δ Cep | Authors: | Nardetto, Nicolas PORETTI, Ennio Anderson, Richard I. Fokin, Andrei Gallenne, Alexandre Gieren, Wolfgang Graczyk, Dariusz Kervella, Pierre Mathias, Philippe Mérand, Antoine Mourard, Denis Neilson, Hilding Pietrzyński, Grzegorz Pilecki, Bogumił RAINER, Monica Storm, Jesper |
Issue Date: | 2018 | Volume: | The RR Lyrae 2017 Conference. Revival of the Classical Pulsators: from Galactic Structure to Stellar Interior Diagnostics | Editors: | Smolec, R.; Kinemuchi, K.; Anderson, R.I. | Series: | PROCEEDINGS OF THE POLISH ASTRONOMICAL SOCIETY | Number: | 6 | First Page: | 217 | Abstract: | Probing the dynamical structure of Cepheid atmospheres is of primary importance in order to better constrain the cosmic distance ladder. It is indeed now well-known that the projection factor (or p-factor), that is used in the Baade-Wesselink method of distance determination of Cepheids, is sensitive to the atmospheric velocity gradient and other subtle dynamical effects. Relying on HARPS-N high resolution spectroscopic observations, we have measured the atmospheric velocity gradient of δ Cep for the first time, and we found an agreement with the hydrodynamical model of the star. Besides, the mysterious k-term, a residual γ-velocity of the order of 1-2 km s^{-1}, seen in HARPS-N data of δ Cep, is now physically understood thanks to recently published predicted spectroscopic properties of two-dimensional time-dependent Cepheid models. | Conference Name: | The RR Lyrae 2017 Conference. Revival of the Classical Pulsators: from Galactic Structure to Stellar Interior Diagnostics | Conference Place: | Niepołomice, Poland | Conference Date: | 17-21 September, 2017 | URI: | http://hdl.handle.net/20.500.12386/28177 | URL: | https://www.pta.edu.pl/proc/v6p1 https://indico.camk.edu.pl/event/3/ |
ISSN: | 2545-1022 | ISBN: | 978-83-938279-9-2 | Bibcode ADS: | 2018pas6.conf..217N | Fulltext: | open |
Appears in Collections: | 3.01 Contributi in Atti di convegno |
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File | Description | Size | Format | |
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v6p217.pdf | Pdf editoriale | 6.95 MB | Adobe PDF | View/Open |
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