Accurate Orbital Solution for the New and Metal-poor Eclipsing Binary Tycho 5227-1023-1
(2017) In Astrophysical Journal 839(1).- Abstract
The orbit and physical parameters of the previously unsolved double-lined eclipsing binary Tyc 5227-1023-1, discovered during the search for RR Lyr variable candidate members of the Aquarius stream, are derived using high-resolution chelle spectroscopy and V, i' photometry. A synthetic spectral analysis of both components has been performed, yielding metallicity [M/H] =-0.63± 0.11 for both stars and a temperature for the secondary that is in close agreement with the one from the orbital solution, while the temperature of the primary is determined from photometry (T1 = 6350 K). The masses and radii (M1= 0.96 ± 0.02, M2 = 0.84 ± 0.01 M⊙, R1 = 1.39 ± 0.01, R2 = 0.98 ± 0.01... (More)
The orbit and physical parameters of the previously unsolved double-lined eclipsing binary Tyc 5227-1023-1, discovered during the search for RR Lyr variable candidate members of the Aquarius stream, are derived using high-resolution chelle spectroscopy and V, i' photometry. A synthetic spectral analysis of both components has been performed, yielding metallicity [M/H] =-0.63± 0.11 for both stars and a temperature for the secondary that is in close agreement with the one from the orbital solution, while the temperature of the primary is determined from photometry (T1 = 6350 K). The masses and radii (M1= 0.96 ± 0.02, M2 = 0.84 ± 0.01 M⊙, R1 = 1.39 ± 0.01, R2 = 0.98 ± 0.01 R⊙) reveal that both stars have already slightly evolved away from the main-sequence band, having an age of about 7 Gyr, and the results of the synthetic spectral analysis support the claim of corotation with the orbital motion. The radial velocity of the system is -60 ± 2 km s-1, while its distance, computed from orbital parameters and the derived reddening EB-V = 0.053, is 496± 35 pc. Even though Tyc 5227-1023-1 was initially treated as a possible member of the Aquarius stream, the results presented here disagree with reported values for this ancient structure and suggest a likely membership of the thick disk.
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- author
- Traven, G. LU ; Munari, U. ; Dallaporta, S. and Zwitter, T.
- publishing date
- 2017-04-10
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- binaries: eclipsing, binaries: spectroscopic, Galaxy: disk, stars: fundamental parameters, stars: individual (Tycho 5227-1023-1)
- in
- Astrophysical Journal
- volume
- 839
- issue
- 1
- article number
- 52
- publisher
- American Astronomical Society
- external identifiers
-
- scopus:85018515582
- ISSN
- 0004-637X
- DOI
- 10.3847/1538-4357/aa6985
- language
- English
- LU publication?
- no
- id
- d3535f38-e4be-4041-a43c-6e3d03a9d5f0
- date added to LUP
- 2019-05-30 00:03:17
- date last changed
- 2022-02-15 20:22:30
@article{d3535f38-e4be-4041-a43c-6e3d03a9d5f0,
abstract = {{<p>The orbit and physical parameters of the previously unsolved double-lined eclipsing binary Tyc 5227-1023-1, discovered during the search for RR Lyr variable candidate members of the Aquarius stream, are derived using high-resolution chelle spectroscopy and V, i' photometry. A synthetic spectral analysis of both components has been performed, yielding metallicity [M/H] =-0.63± 0.11 for both stars and a temperature for the secondary that is in close agreement with the one from the orbital solution, while the temperature of the primary is determined from photometry (T<sub>1</sub> = 6350 K). The masses and radii (M<sub>1</sub>= 0.96 ± 0.02, M<sub>2</sub> = 0.84 ± 0.01 M<sub>⊙</sub>, R<sub>1</sub> = 1.39 ± 0.01, R<sub>2</sub> = 0.98 ± 0.01 R<sub>⊙</sub>) reveal that both stars have already slightly evolved away from the main-sequence band, having an age of about 7 Gyr, and the results of the synthetic spectral analysis support the claim of corotation with the orbital motion. The radial velocity of the system is -60 ± 2 km s<sup>-1</sup>, while its distance, computed from orbital parameters and the derived reddening E<sub>B-V</sub> = 0.053, is 496± 35 pc. Even though Tyc 5227-1023-1 was initially treated as a possible member of the Aquarius stream, the results presented here disagree with reported values for this ancient structure and suggest a likely membership of the thick disk.</p>}},
author = {{Traven, G. and Munari, U. and Dallaporta, S. and Zwitter, T.}},
issn = {{0004-637X}},
keywords = {{binaries: eclipsing; binaries: spectroscopic; Galaxy: disk; stars: fundamental parameters; stars: individual (Tycho 5227-1023-1)}},
language = {{eng}},
month = {{04}},
number = {{1}},
publisher = {{American Astronomical Society}},
series = {{Astrophysical Journal}},
title = {{Accurate Orbital Solution for the New and Metal-poor Eclipsing Binary Tycho 5227-1023-1}},
url = {{http://dx.doi.org/10.3847/1538-4357/aa6985}},
doi = {{10.3847/1538-4357/aa6985}},
volume = {{839}},
year = {{2017}},
}