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The blue straggler ...
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Brogaard, K.Aarhus Univ, Stellar Astrophys Ctr, Dept Phys & Astron, Ny Munkegade 120, DK-8000 Aarhus C, Denmark;Univ Birmingham, Sch Phys & Astron, Birmingham B15 2TT, W Midlands, England
(author)
The blue straggler V106 in NGC 6791 : a prototype progenitor of old single giants masquerading as young
- Article/chapterEnglish2018
Publisher, publication year, extent ...
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2018-09-18
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Oxford University Press (OUP),2018
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printrdacarrier
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LIBRIS-ID:oai:DiVA.org:uu-374129
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https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-374129URI
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https://doi.org/10.1093/mnras/sty2504DOI
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Language:English
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Summary in:English
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Subject category:ref swepub-contenttype
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Subject category:art swepub-publicationtype
Notes
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We determine the properties of the binary star V106 in the old open cluster NGC 6791. We identify the system to be a blue straggler cluster member by using a combination of ground-based and Kepler photometry and multi-epoch spectroscopy. The properties of the primary component are found to be M-p similar to 1.67 M-circle dot, more massive than the cluster turn-off, with R-p similar to 1.91 R-circle dot and T-eff = 7110 +/- 100 K. The secondary component is highly oversized and overluminous for its low mass with M-s similar to 0.182 M-circle dot, R-s similar to 0.864 R-circle dot, and T-eff = 6875 +/- 200 K. We identify this secondary star as a bloated (proto) extremely low-mass helium white dwarf. These properties of V106 suggest that it represents a typical Algol-paradox system and that it evolved through a mass-transfer phase, which provides insight into its past evolution. We present a detailed binary stellar evolution model for the formation of V106 using the MESA code and find that the mass-transfer phase only ceased about 40 Myr ago. Due to the short orbital period (P = 1.4463 d), another mass-transfer phase is unavoidable once the current primary star evolves towards the red giant phase. We argue that V106 will evolve through a common-envelope phase within the next 100 Myr and merge to become a single overmassive giant. The high mass will make it appear young for its true age, which is revealed by the cluster properties. Therefore, V106 is potentially a prototype progenitor of old field giants masquerading as young.
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Christiansen, S. M.Aarhus Univ, Stellar Astrophys Ctr, Dept Phys & Astron, Ny Munkegade 120, DK-8000 Aarhus C, Denmark
(author)
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Grundahl, F.Aarhus Univ, Stellar Astrophys Ctr, Dept Phys & Astron, Ny Munkegade 120, DK-8000 Aarhus C, Denmark
(author)
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Miglio, A.Aarhus Univ, Stellar Astrophys Ctr, Dept Phys & Astron, Ny Munkegade 120, DK-8000 Aarhus C, Denmark;Univ Birmingham, Sch Phys & Astron, Birmingham B15 2TT, W Midlands, England
(author)
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Izzard, R. G.Univ Surrey, Fac Engn & Phys Sci, Astrophys Res Grp, Guildford GU2 7XH, Surrey, England
(author)
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Tauris, T. M.Univ Bonn, Argelander Inst Astron, Hugel 71, D-53121 Bonn, Germany;Max Planck Inst Radioastron, D-53121 Bonn, Germany;Aarhus Univ, Dept Phys & Astron, Ny Munkegade 120, DK-8000 Aarhus C, Denmark
(author)
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Sandquist, E. L.San Diego State Univ, Dept Astron, San Diego, CA 92182 USA
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VandenBerg, D. A.Univ Victoria, Dept Phys & Astron, POB 1700 STN CSC, Victoria, BC V8W 2Y2, Canada
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Jessen-Hansen, J.Aarhus Univ, Stellar Astrophys Ctr, Dept Phys & Astron, Ny Munkegade 120, DK-8000 Aarhus C, Denmark
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Arentoft, T.Aarhus Univ, Stellar Astrophys Ctr, Dept Phys & Astron, Ny Munkegade 120, DK-8000 Aarhus C, Denmark
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Bruntt, H.Aarhus Univ, Stellar Astrophys Ctr, Dept Phys & Astron, Ny Munkegade 120, DK-8000 Aarhus C, Denmark
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Frandsen, S.Aarhus Univ, Stellar Astrophys Ctr, Dept Phys & Astron, Ny Munkegade 120, DK-8000 Aarhus C, Denmark
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Orosz, J. A.San Diego State Univ, Dept Astron, San Diego, CA 92182 USA
(author)
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Feiden, Gregory A.,1986-Uppsala universitet,Teoretisk astrofysik(Swepub:uu)grefe950
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Mathieu, R.Univ Wisconsin, Dept Astron, Madison, WI 53706 USA
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Geller, A.Univ Wisconsin, Dept Astron, Madison, WI 53706 USA
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Shetrone, M.Univ Texas, McDonald Observ, HC75 Box 1337-L, Ft Davis, TX 79734 USA
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Ryde, N.Lund Univ, Lund Observ, Dept Astron & Theoret Phys, Box 43, SE-22100 Lund, Sweden
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Stello, D.Aarhus Univ, Stellar Astrophys Ctr, Dept Phys & Astron, Ny Munkegade 120, DK-8000 Aarhus C, Denmark;Univ Sydney, Sch Phys, Sydney Inst Astron SIfA, Sydney, NSW 2006, Australia;Univ New South Wales, Sch Phys, Sydney, NSW 2052, Australia
(author)
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Platais, I.Johns Hopkins Univ, Dept Phys & Astron, 3400 North Charles St, Baltimore, MD 21218 USA
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Meibom, S.Harvard Smithsonian Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA
(author)
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Aarhus Univ, Stellar Astrophys Ctr, Dept Phys & Astron, Ny Munkegade 120, DK-8000 Aarhus C, Denmark;Univ Birmingham, Sch Phys & Astron, Birmingham B15 2TT, W Midlands, EnglandAarhus Univ, Stellar Astrophys Ctr, Dept Phys & Astron, Ny Munkegade 120, DK-8000 Aarhus C, Denmark
(creator_code:org_t)
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In:Monthly notices of the Royal Astronomical Society: Oxford University Press (OUP)481:4, s. 5062-50720035-87111365-2966
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Brogaard, K.
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Christiansen, S. ...
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Grundahl, F.
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Miglio, A.
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Izzard, R. G.
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Tauris, T. M.
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Sandquist, E. L.
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VandenBerg, D. A ...
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Jessen-Hansen, J ...
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Arentoft, T.
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Bruntt, H.
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Frandsen, S.
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Orosz, J. A.
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Feiden, Gregory ...
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Mathieu, R.
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Geller, A.
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Shetrone, M.
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Ryde, N.
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Stello, D.
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Platais, I.
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Meibom, S.
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