Skip navigation
  • INAF logo
  • Home
  • Communities
    & Collections
  • Research outputs
  • Researchers
  • Organization units
  • Projects
  • Explore by
    • Research outputs
    • Researchers
    • Organization units
    • Projects
  • Login:
    • My DSpace
    • Receive email
      updates
    • Edit Account details
  • Italian
  • English

  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/27923
Title: Asteroseismology of KIC 7107778: a binary comprising almost identical subgiants
Authors: Li, Yaguang
Bedding, Timothy R.
Li, Tanda
Bi, Shaolan
Murphy, Simon J.
CORSARO, ENRICO MARIA NICOLA 
Chen, Li
Tian, Zhijia
Issue Date: 2018
Journal: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 
Number: 476
Issue: 1
First Page: 470
Abstract: We analyse an asteroseismic binary system: KIC 7107778, a non-eclipsing, unresolved target, with solar-like oscillations in both components. We used Kepler short cadence time series spanning nearly 2 yr to obtain the power spectrum. Oscillation mode parameters were determined using Bayesian inference and a nested sampling Monte Carlo algorithm with the DIAMONDS package. The power profiles of the two components fully overlap, indicating their close similarity. We modelled the two stars with MESA and calculated oscillation frequencies with GYRE. Stellar fundamental parameters (mass, radius, and age) were estimated by grid modelling with atmospheric parameters and the oscillation frequencies of l = 0, 2 modes as constraints. Most l = 1 mixed modes were identified with models searched using a bisection method. Stellar parameters for the two sub-giant stars are M<SUB>A</SUB> = 1.42 ± 0.06 M<SUB>☉</SUB>, M<SUB>B</SUB> = 1.39 ± 0.03 M<SUB>☉</SUB>, R<SUB>A</SUB> = 2.93 ± 0.05 R<SUB>☉</SUB>, R<SUB>B</SUB> = 2.76 ± 0.04 R<SUB>☉</SUB>, t<SUB>A</SUB> = 3.32 ± 0.54 Gyr and t<SUB>B</SUB> = 3.51 ± 0.33 Gyr. The mass difference of the system is ∼1 per cent. The results confirm their simultaneous birth and evolution, as is expected from binary formation. KIC 7107778 comprises almost identical twins, and is the first asteroseismic sub-giant binary to be detected.
URI: http://hdl.handle.net/20.500.12386/27923
URL: https://academic.oup.com/mnras/article/476/1/470/4828389
ISSN: 0035-8711
DOI: 10.1093/mnras/sty222
Bibcode ADS: 2018MNRAS.476..470L
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

Files in This Item:
File Description SizeFormat 
sty222.pdfPdf editoriale1.35 MBAdobe PDFView/Open
Show full item record

Page view(s)

4
checked on Jan 19, 2021

Download(s)

2
checked on Jan 19, 2021

Google ScholarTM

Check

Altmetric


Items in DSpace are published in Open Access, unless otherwise indicated.


Explore by
  • Communities
    & Collections
  • Research outputs
  • Researchers
  • Organization units
  • Projects

Informazioni e guide per autori

https://openaccess-info.inaf.it: tutte le informazioni sull'accesso aperto in INAF

Come si inserisce un prodotto: le guide a OA@INAF

La Policy INAF sull'accesso aperto

Documenti e modelli scaricabili

Feedback
Built with DSpace-CRIS - Extension maintained and optimized by Logo 4SCIENCE