A celestial matryoshka

• Verfasst von: Drimmel, Ronald [VerfasserIn]
• Verfasst von: Sozzetti, Alessandro [VerfasserIn]
• Verfasst von: Schröder, Klaus-Peter [VerfasserIn]
• Verfasst von: Bastian, Ulrich [VerfasserIn]
• Verfasst von: Pinamonti, Matteo [VerfasserIn]
• Verfasst von: Jack, Dennis [VerfasserIn]
• Verfasst von: Hernández Huerta, Missael A. [VerfasserIn]
• Titel: A celestial matryoshka
• Titelzusatz: dynamical and spectroscopic analysis of the Albireo system
• Verf.angabe: Ronald Drimmel, Alessandro Sozzetti, Klaus-Peter Schröder, Ulrich Bastian, Matteo Pinamonti, Dennis Jack and Missael A. Hernández Huerta
• E-Jahr: 2021
• Jahr: 12 January 2021
• Umfang: 23 S.
• Fussnoten: Gesehen am 05.08.2021
• Titel Quelle: Enthalten in: Royal Astronomical SocietyMonthly notices of the Royal Astronomical Society
• Ort Quelle: Oxford : Oxford Univ. Press, 1827
• Jahr Quelle: 2021
• Band/Heft Quelle: 502(2021), 1 vom: März, Seite 328-350
• ISSN Quelle: 1365-2966
• DOI: doi:10.1093/mnras/staa4038
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1765624428

Abstract

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