A celestial matryoshka: dynamical and spectroscopic analysis of the Albireo system
We present a spectroscopic characterization and a new orbital solution for the binary system β Cyg Aa/Ac (MCA 55), the primary component ( β Cyg A) of the well-known wide double star Albireo. By matching evolutionary tracks to the physical parameters of all three Albireo stars ( β Cyg Aa, Ac, and B...
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| Hauptverfasser: | , , , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
12 January 2021
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| In: |
Monthly notices of the Royal Astronomical Society
Year: 2021, Jahrgang: 502, Heft: 1, Pages: 328-350 |
| ISSN: | 1365-2966 |
| DOI: | 10.1093/mnras/staa4038 |
| Online-Zugang: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1093/mnras/staa4038
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| Verfasserangaben: | Ronald Drimmel, Alessandro Sozzetti, Klaus-Peter Schröder, Ulrich Bastian, Matteo Pinamonti, Dennis Jack and Missael A. Hernández Huerta |
MARC
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| 100 | 1 | |a Drimmel, Ronald |e VerfasserIn |0 (DE-588)1238235778 |0 (DE-627)1765623685 |4 aut | |
| 245 | 1 | 2 | |a A celestial matryoshka |b dynamical and spectroscopic analysis of the Albireo system |c Ronald Drimmel, Alessandro Sozzetti, Klaus-Peter Schröder, Ulrich Bastian, Matteo Pinamonti, Dennis Jack and Missael A. Hernández Huerta |
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| 520 | |a We present a spectroscopic characterization and a new orbital solution for the binary system β Cyg Aa/Ac (MCA 55), the primary component ( β Cyg A) of the well-known wide double star Albireo. By matching evolutionary tracks to the physical parameters of all three Albireo stars ( β Cyg Aa, Ac, and B) as obtained from a spectroscopic analysis of TIGRE and IUE spectra, we confirm that they are likely coeval. Our final orbit solution is based on radial-velocity measurements taken over a baseline exceeding 120 yr, combined with relative astrometry from speckle interferometric observations and the absolute astrometry from the Hipparcos and Gaia missions. Our final orbit solution has a period of 121.65$^{+3.34}_{-2.90}$ yr with an eccentricity of 0.20$^{+0.01}_{-0.02}$. Thanks to the inclusion of the absolute astrometry, we find a mass ratio of |q = 1.25^{+0.19}_{-0.17}$, and a total mass of $9.47_{-3.24}^{+5.88}$ M⊙, indicating that the secondary (Ac) is the more massive of the pair. These results strongly suggest the presence of a fourth, unseen, member of the Albireo system. Given the current photometric data, it is likely that β Cyg A is itself a hierarchical triple. We also derive the systemic proper motion, line-of-sight velocity, and an orbital parallax of the β Cyg A system, allowing us to quantitatively assess the hypothesis that Albireo A and B form a physically bound and genealogically connected system. Finally, we find four potential members of a common proper motion group with Albireo, though none anywhere as close by as the Albireo components A to B. | ||
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| 700 | 1 | |a Schröder, Klaus-Peter |e VerfasserIn |4 aut | |
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| 700 | 1 | |a Pinamonti, Matteo |e VerfasserIn |4 aut | |
| 700 | 1 | |a Jack, Dennis |e VerfasserIn |4 aut | |
| 700 | 1 | |a Hernández Huerta, Missael A. |e VerfasserIn |4 aut | |
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