Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 448, Issue 2, Pages 1945-1955Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stu2680
Keywords
binaries: eclipsing; binaries: spectroscopic; stars: evolution; stars: fundamental parameters; stars: individual: HD 187669; stars: late-type
Categories
Funding
- Polish National Science centre [2011/03/N/ST9/01819, 2013/09/B/ST9/01551, 5813/B/H03/2011/40, 2011/01/N/ST9/02209]
- Foundation for Polish Science
- BASAL Centro de Astrofisica y Tecnologias Afines [PFB-06/2007]
- Millennium Institute of Astrophysics of the Iniciativa Cientifica Milenio del Ministerio de Economia, Fomento y Turismo de Chile [IC120009]
- Fondecyt [1130721]
- European Research Council
- Ministry of Science and Higher Education [W103/ERC/2011]
- National Science Foundation [0959447, 0836187, 0707634, 0449001]
- European Social Fund
- national budget of the Republic of Poland
- UK's Science and Technology Facilities Council
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [0707634, 0449001, 0959447] Funding Source: National Science Foundation
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [1211782] Funding Source: National Science Foundation
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We present the first full orbital and physical analysis of HD 187669, recognized by the AllSky Automated Survey (ASAS) as the eclipsing binary ASAS J195222-3233.7. We combined multi-band photometry from the ASAS and SuperWASP public archives and 0.41-m PROMPT robotic telescopes with our high-precision radial velocities from the HARPS spectrograph. Two different approaches were used for the analysis: (1) fitting to all data simultaneously with the WD code and (2) analysing each light curve (with JKTEBOP) and radial velocities separately and combining the partial results at the end. This system also shows a total primary (deeper) eclipse, lasting for about 6 d. A spectrum obtained during this eclipse was used to perform atmospheric analysis with the MOOG and SME codes to constrain the physical parameters of the secondary. We found that ASAS J195222-3233.7 is a double-lined spectroscopic binary composed of two evolved, late-type giants, with masses of M-1 = 1.504 +/- 0.004 and M-2 = 1.505 +/- 0.004 M-circle dot, and radii of R-1 = 11.33 +/- 0.28 and R-2 = 22.62 +/- 0.50 R-circle dot. It is slightly less metal abundant than the Sun, and has a P = 88.39 d orbit. Its properties are well reproduced by a 2.38-Gyr isochrone, and thanks to the metallicity estimation from the totality spectrum and high precision of the masses, it was possible to constrain the age down to 0.1 Gyr. It is the first so evolved Galactic eclipsing binary measured with such good accuracy, and as such it is a unique benchmark for studying the late stages of stellar evolution.
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