A celestial matryoshka: dynamical and spectroscopic analysis of the Albireo system
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,...
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creator | Drimmel, Ronald Sozzetti, Alessandro Schröder, Klaus-Peter Bastian, Ulrich Pinamonti, Matteo Jack, Dennis Hernández Huerta, Missael A |
description | 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 $q = 1.25^{+0.19}_{-0.17}$, 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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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.</description><identifier>ISSN: 0035-8711</identifier><identifier>EISSN: 1365-2966</identifier><identifier>DOI: 10.1093/mnras/staa4038</identifier><language>eng</language><publisher>Oxford University Press</publisher><ispartof>Monthly notices of the Royal Astronomical Society, 2021-03, Vol.502 (1), p.328-350</ispartof><rights>2021 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society 2021</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c273t-483dd5b5bcc2d3c8b722cdc3643ced475f398d6751095dede6775c766c95ed533</citedby><cites>FETCH-LOGICAL-c273t-483dd5b5bcc2d3c8b722cdc3643ced475f398d6751095dede6775c766c95ed533</cites><orcidid>0000-0003-3343-6743 ; 0000-0002-7504-365X ; 0000-0002-8667-1715 ; 0000-0002-1777-5502 ; 0000-0002-4445-1845</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784,1604,27924,27925</link.rule.ids><linktorsrc>$$Uhttps://dx.doi.org/10.1093/mnras/staa4038$$EView_record_in_Oxford_University_Press$$FView_record_in_$$GOxford_University_Press</linktorsrc></links><search><creatorcontrib>Drimmel, Ronald</creatorcontrib><creatorcontrib>Sozzetti, Alessandro</creatorcontrib><creatorcontrib>Schröder, Klaus-Peter</creatorcontrib><creatorcontrib>Bastian, Ulrich</creatorcontrib><creatorcontrib>Pinamonti, Matteo</creatorcontrib><creatorcontrib>Jack, Dennis</creatorcontrib><creatorcontrib>Hernández Huerta, Missael A</creatorcontrib><title>A celestial matryoshka: dynamical and spectroscopic analysis of the Albireo system</title><title>Monthly notices of the Royal Astronomical Society</title><description>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 $q = 1.25^{+0.19}_{-0.17}$, 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.</description><issn>0035-8711</issn><issn>1365-2966</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2021</creationdate><recordtype>article</recordtype><recordid>eNqFkM1LxDAQxYMoWFevnnP10N2k0yStt2XxCxYE0XNJJylb7ReZeOh_b3X17GngMe_x3o-xaynWUpSw6YdgaUPR2lxAccISCVqlWan1KUuEAJUWRspzdkH0LoTIIdMJe9ly9J2n2NqO9zaGeaTDh73lbh5s3-Ki2sFxmjzGMBKOU4uLYruZWuJjw-PB821Xt8GPnGaKvr9kZ43tyF_93hV7u7973T2m--eHp912n2JmIKZ5Ac6pWtWImQMsapNl6BB0DuhdblQDZeG0Ucs45bzz2hiFRmsslXcKYMXWx1xcilHwTTWFtrdhrqSovolUP0SqPyKL4eZoGD-n_36_AFPmZjU</recordid><startdate>20210301</startdate><enddate>20210301</enddate><creator>Drimmel, Ronald</creator><creator>Sozzetti, Alessandro</creator><creator>Schröder, Klaus-Peter</creator><creator>Bastian, Ulrich</creator><creator>Pinamonti, Matteo</creator><creator>Jack, Dennis</creator><creator>Hernández Huerta, Missael A</creator><general>Oxford University Press</general><scope>AAYXX</scope><scope>CITATION</scope><orcidid>https://orcid.org/0000-0003-3343-6743</orcidid><orcidid>https://orcid.org/0000-0002-7504-365X</orcidid><orcidid>https://orcid.org/0000-0002-8667-1715</orcidid><orcidid>https://orcid.org/0000-0002-1777-5502</orcidid><orcidid>https://orcid.org/0000-0002-4445-1845</orcidid></search><sort><creationdate>20210301</creationdate><title>A celestial matryoshka: dynamical and spectroscopic analysis of the Albireo system</title><author>Drimmel, Ronald ; Sozzetti, Alessandro ; Schröder, Klaus-Peter ; Bastian, Ulrich ; Pinamonti, Matteo ; Jack, Dennis ; Hernández Huerta, Missael A</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c273t-483dd5b5bcc2d3c8b722cdc3643ced475f398d6751095dede6775c766c95ed533</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2021</creationdate><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Drimmel, Ronald</creatorcontrib><creatorcontrib>Sozzetti, Alessandro</creatorcontrib><creatorcontrib>Schröder, Klaus-Peter</creatorcontrib><creatorcontrib>Bastian, Ulrich</creatorcontrib><creatorcontrib>Pinamonti, Matteo</creatorcontrib><creatorcontrib>Jack, Dennis</creatorcontrib><creatorcontrib>Hernández Huerta, Missael A</creatorcontrib><collection>CrossRef</collection><jtitle>Monthly notices of the Royal Astronomical Society</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>Drimmel, Ronald</au><au>Sozzetti, Alessandro</au><au>Schröder, Klaus-Peter</au><au>Bastian, Ulrich</au><au>Pinamonti, Matteo</au><au>Jack, Dennis</au><au>Hernández Huerta, Missael A</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>A celestial matryoshka: dynamical and spectroscopic analysis of the Albireo system</atitle><jtitle>Monthly notices of the Royal Astronomical Society</jtitle><date>2021-03-01</date><risdate>2021</risdate><volume>502</volume><issue>1</issue><spage>328</spage><epage>350</epage><pages>328-350</pages><issn>0035-8711</issn><eissn>1365-2966</eissn><abstract>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 $q = 1.25^{+0.19}_{-0.17}$, 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.</abstract><pub>Oxford University Press</pub><doi>10.1093/mnras/staa4038</doi><tpages>23</tpages><orcidid>https://orcid.org/0000-0003-3343-6743</orcidid><orcidid>https://orcid.org/0000-0002-7504-365X</orcidid><orcidid>https://orcid.org/0000-0002-8667-1715</orcidid><orcidid>https://orcid.org/0000-0002-1777-5502</orcidid><orcidid>https://orcid.org/0000-0002-4445-1845</orcidid></addata></record> |
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title | A celestial matryoshka: dynamical and spectroscopic analysis of the Albireo system |
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