{"id":2905,"date":"2024-04-19T18:21:00","date_gmt":"2024-04-19T18:21:00","guid":{"rendered":"https:\/\/araucaria.camk.edu.pl\/?p=2905"},"modified":"2024-10-08T17:08:01","modified_gmt":"2024-10-08T17:08:01","slug":"orbital-parameters-of-the-inner-binary-system-of-the-%ce%b4-cephei-system","status":"publish","type":"post","link":"https:\/\/araucaria.camk.edu.pl\/index.php\/2024\/04\/19\/orbital-parameters-of-the-inner-binary-system-of-the-%ce%b4-cephei-system\/","title":{"rendered":"Orbital parameters of the inner binary system of the \u03b4 Cephei system"},"content":{"rendered":"\n

An inner companion has recently been discovered orbiting the prototype of classical Cepheids, \u03b4 Cep, whose orbital parameters are now reported.<\/p>\n\n\n\n

\n\n\n\n

The orbital parameters of the \u03b4 Cep inner binary system determined using 2019 HARPS-N spectroscopic data<\/strong><\/h3>\n\n\n\n

N. Nardetto, V. Hocd\u00e9, P. Kervella, A. Gallenne, W. Gieren, D. Graczyk, A. Merand, M. Rainer, J. Storm, G. Pietrzy\u0144ski, B. Pilecki, E. Poretti, M. Bailleul, G. Bras, A. Afanasiev<\/em><\/p>\n\n\n\n

2024, A&A 684L, 9<\/a>
Corrigendum<\/a><\/p>\n\n\n\n

We collected new precise radial velocity (RV) measurements of \u03b4 Cep in 2019 using the HARPS-N spectrograph mounted at the 3.58-m Telescopio Nazionale Galileo, La Palma, Spain. These RV measurements, compared with RV templates available in the literature, allowed us to derived the orbital parameters of the system: orbital period P<\/em>orb<\/sub> = 9.32 years, eccentricity e<\/em> = 0.71, a semimajor axis a<\/em> = 0.029 arcsec, and a center-of-mass velocity V<\/em>0<\/sub> = \u221217.28 km\/s, among other parameters.<\/p>\n\n\n\n

The resulting orbital parameters of the \u03b4 Cep inner binary system and a cleaned RV curve of the pulsation of the star will be used to study its Baade\u2013Wesselink projection factor in a future publication.<\/p>\n\n\n

\n
\"\"
Projection of the a posteriori distribution for the estimated orbit (left panel) and the RV curve (right panel) for the SB1 system of \u03b4 Cep.<\/figcaption><\/figure><\/div>\n\n\n

<\/p>\n","protected":false},"excerpt":{"rendered":"

An inner companion has recently been discovered orbiting the prototype of classical Cepheids, \u03b4 Cep, whose orbital parameters are now reported.<\/p>\n","protected":false},"author":1,"featured_media":2938,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[10],"tags":[13,11],"class_list":["post-2905","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-science-highlights","tag-binary","tag-cepheid"],"_links":{"self":[{"href":"https:\/\/araucaria.camk.edu.pl\/index.php\/wp-json\/wp\/v2\/posts\/2905","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/araucaria.camk.edu.pl\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/araucaria.camk.edu.pl\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/araucaria.camk.edu.pl\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/araucaria.camk.edu.pl\/index.php\/wp-json\/wp\/v2\/comments?post=2905"}],"version-history":[{"count":1,"href":"https:\/\/araucaria.camk.edu.pl\/index.php\/wp-json\/wp\/v2\/posts\/2905\/revisions"}],"predecessor-version":[{"id":2910,"href":"https:\/\/araucaria.camk.edu.pl\/index.php\/wp-json\/wp\/v2\/posts\/2905\/revisions\/2910"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/araucaria.camk.edu.pl\/index.php\/wp-json\/wp\/v2\/media\/2938"}],"wp:attachment":[{"href":"https:\/\/araucaria.camk.edu.pl\/index.php\/wp-json\/wp\/v2\/media?parent=2905"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/araucaria.camk.edu.pl\/index.php\/wp-json\/wp\/v2\/categories?post=2905"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/araucaria.camk.edu.pl\/index.php\/wp-json\/wp\/v2\/tags?post=2905"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}