prikaz prve stranice dokumenta Seismic probing of the first dredge-up event through the eccentric red-giant and red-giant spectroscopic binary KIC 9163796
  Preuzmi
PDF 2.53 MB
Znanstveni rad - Izvorni znanstveni rad
Seismic probing of the first dredge-up event through the eccentric red-giant and red-giant spectroscopic binary KIC 9163796
Astronomy & Astrophysics, 612 (2018); A22. https://doi.org/10.1051/0004-6361/201731269
Beck, P. G.; Kallinger, T.; Pavlovski, Krešimir; Palacios, A.; Tkachenko, A.; Mathis, S.; García, R. A.; Corsaro, E.; Johnston, C.; Mosser, B.; Ceillier, T.; do Nascimento, J.-D.; Raskin, G.

Citirajte ovaj rad

Beck, P. G., Kallinger, T., Pavlovski, K., Palacios, A., Tkachenko, A., Mathis, S. ... Raskin, G. (2018). Seismic probing of the first dredge-up event through the eccentric red-giant and red-giant spectroscopic binary KIC 9163796. Astronomy & Astrophysics, 612.. doi: 10.1051/0004-6361/201731269

Beck, P. G., et al. "Seismic probing of the first dredge-up event through the eccentric red-giant and red-giant spectroscopic binary KIC 9163796." Astronomy & Astrophysics, vol. 612, 2018. https://doi.org/10.1051/0004-6361/201731269

Beck, P. G., T. Kallinger, Krešimir Pavlovski, A. Palacios, A. Tkachenko, S. Mathis, R. A. García, et al. "Seismic probing of the first dredge-up event through the eccentric red-giant and red-giant spectroscopic binary KIC 9163796." Astronomy & Astrophysics 612 (2018). https://doi.org/10.1051/0004-6361/201731269

Beck, P. G., et al. (2018) 'Seismic probing of the first dredge-up event through the eccentric red-giant and red-giant spectroscopic binary KIC 9163796', Astronomy & Astrophysics, 612. doi: 10.1051/0004-6361/201731269

Beck PG, Kallinger T, Pavlovski K, Palacios A, Tkachenko A, Mathis S, i sur.. Seismic probing of the first dredge-up event through the eccentric red-giant and red-giant spectroscopic binary KIC 9163796. Astronomy & Astrophysics [Internet]. 13.04.2018. [pristupljeno 24.12.2024.];612. doi: 10.1051/0004-6361/201731269

P. G. Beck, et al., "Seismic probing of the first dredge-up event through the eccentric red-giant and red-giant spectroscopic binary KIC 9163796", Astronomy & Astrophysics, vol. 612, Travanj 2018. [Online]. Dostupno na: https://urn.nsk.hr/urn:nbn:hr:217:264663. [Citirano: 24.12.2024.]

Za citiranje koristite ovu mrežnu adresu: https://urn.nsk.hr/urn:nbn:hr:217:264663
Prijavite se u repozitorij kako biste mogli spremiti objekt u svoju listu.
Podaci o radu
Naslov (engleski)Seismic probing of the first dredge-up event through the eccentric red-giant and red-giant spectroscopic binary KIC 9163796
AutorP. G. Beck
AutorT. Kallinger
AutorKrešimir Pavlovski
AutorA. Palacios
AutorA. Tkachenko
AutorS. Mathis
AutorR. A. García
AutorE. Corsaro
AutorC. Johnston
AutorB. Mosser
AutorT. Ceillier
AutorJ.-D. do Nascimento
AutorG. Raskin
Autorova ustanovaSveučilište u Zagrebu
Prirodoslovno-matematički fakultet
(Fizički odsjek)
Znanstveno / umjetničko
područje, polje i grana		PRIRODNE ZNANOSTI
Fizika
Sažetak (engleski)
Context. Binaries in double-lined spectroscopic systems (SB2) provide a homogeneous set of stars. Differences of parameters, such as age or initial conditions, which otherwise would have strong impact on the stellar evolution, can be neglected. The observed differences are determined by the difference in stellar mass between the two components. The mass ratio can be determined with much higher accuracy than the actual stellar mass. Aim. In this work, we aim to study the eccentric binary system KIC 9163796, whose two components are very close in mass and both are low-luminosity red-giant stars. Methods: We analysed four years of Kepler space photometry and we obtained high-resolution spectroscopy with the Hermes instrument. The orbital elements and the spectra of both components were determined using spectral disentangling methods. The effective temperatures, and metallicities were extracted from disentangled spectra of the two stars. Mass and radius of the primary were determined through asteroseismology. The surface rotation period of the primary is determined from the Kepler light curve. From representative theoretical models of the star, we derived the internal rotational gradient, while for a grid of models, the measured lithium abundance is compared with theoretical predictions. Results: From seismology the primary of KIC 9163796 is a star of 1.39 ± 0.06 M⊙, while the spectroscopic mass ratio between both components can be determined with much higher precision by spectral disentangling to be 1.015 ± 0.005. With such mass and a difference in effective temperature of 600 K from spectroscopy, the secondary and primary are, respectively, in the early and advanced stage of the first dredge-up event on the red-giant branch. The period of the primary's surface rotation resembles the orbital period within ten days. The radial rotational gradient between the surface and core in KIC 9163796 is found to be 6.9-1.0+2.0. This is a low value but not exceptional if compared to the sample of typical single field stars. The seismic average of the envelope's rotation agrees with the surface rotation rate. The lithium'abundance is in agreement with quasi rigidly rotating models. Conclusions: The agreement between the surface rotation with the seismic result indicates that the full convective envelope is rotating quasi-rigidly. The models of the lithium abundance are compatible with a rigid rotation in the radiative zone during the main sequence. Because of the many constraints offered by oscillating stars in binary systems, such objects are important test beds of stellar evolution.
Ključne riječi (hrvatski)
Jezikengleski
Vrsta publikacijeZnanstveni rad - Izvorni znanstveni rad
Status objaveObjavljen
Vrsta recenzijeRecenziran - međunarodna recenzija
Verzija publikacijeObjavljena verzija rada (izdavačev PDF)
Naslov časopisaAstronomy & Astrophysics
Brojčani podacivol. 612, A22
p-ISSN0004-6361
e-ISSN1432-0746
DOIhttps://doi.org/10.1051/0004-6361/201731269
URN:NBNurn:nbn:hr:217:264663
Datum objave publikacije2018-04-13
ProjektŠifra: IP-2014-09-8656
Naziv (hrvatski): Zvijezde i prašina: struktura, sastav i interakcija
Naziv (engleski): Stars and dust: structure, composition and interaction
Kratica: STARDUST
Voditelj: Krešimir Pavlovski
Pravna nadležnost: Hrvatska
Financijer: Hrvatska zaklada za znanost
Linija financiranja: Research Projects
URL dokumentahttps://www.aanda.org/10.1051/0004-6361/201731269
Vrsta resursaTekst
Prava pristupaOtvoreni pristup
Uvjeti korištenjaIkona licence Zaštićeno autorskim pravom.
Javna napomena© ESO 2018. Received: 29 May 2017. Accepted: 13 December 2017. Published online 13 April 2018.
Datum i vrijeme pohrane2024-09-29 20:12:58