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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 ...

  • 2018-09-18
  • Oxford University Press (OUP),2018
  • printrdacarrier

Numbers

  • LIBRIS-ID:oai:DiVA.org:uu-374129
  • https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-374129URI
  • https://doi.org/10.1093/mnras/sty2504DOI

Supplementary language notes

  • Language:English
  • Summary in:English

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  • Subject category:ref swepub-contenttype
  • Subject category:art swepub-publicationtype

Notes

  • 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)
  • Grundahl, F.Aarhus Univ, Stellar Astrophys Ctr, Dept Phys & Astron, Ny Munkegade 120, DK-8000 Aarhus C, Denmark (author)
  • 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)
  • Izzard, R. G.Univ Surrey, Fac Engn & Phys Sci, Astrophys Res Grp, Guildford GU2 7XH, Surrey, England (author)
  • 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)
  • Sandquist, E. L.San Diego State Univ, Dept Astron, San Diego, CA 92182 USA (author)
  • VandenBerg, D. A.Univ Victoria, Dept Phys & Astron, POB 1700 STN CSC, Victoria, BC V8W 2Y2, Canada (author)
  • Jessen-Hansen, J.Aarhus Univ, Stellar Astrophys Ctr, Dept Phys & Astron, Ny Munkegade 120, DK-8000 Aarhus C, Denmark (author)
  • Arentoft, T.Aarhus Univ, Stellar Astrophys Ctr, Dept Phys & Astron, Ny Munkegade 120, DK-8000 Aarhus C, Denmark (author)
  • Bruntt, H.Aarhus Univ, Stellar Astrophys Ctr, Dept Phys & Astron, Ny Munkegade 120, DK-8000 Aarhus C, Denmark (author)
  • Frandsen, S.Aarhus Univ, Stellar Astrophys Ctr, Dept Phys & Astron, Ny Munkegade 120, DK-8000 Aarhus C, Denmark (author)
  • Orosz, J. A.San Diego State Univ, Dept Astron, San Diego, CA 92182 USA (author)
  • Feiden, Gregory A.,1986-Uppsala universitet,Teoretisk astrofysik(Swepub:uu)grefe950 (author)
  • Mathieu, R.Univ Wisconsin, Dept Astron, Madison, WI 53706 USA (author)
  • Geller, A.Univ Wisconsin, Dept Astron, Madison, WI 53706 USA (author)
  • Shetrone, M.Univ Texas, McDonald Observ, HC75 Box 1337-L, Ft Davis, TX 79734 USA (author)
  • Ryde, N.Lund Univ, Lund Observ, Dept Astron & Theoret Phys, Box 43, SE-22100 Lund, Sweden (author)
  • 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)
  • Platais, I.Johns Hopkins Univ, Dept Phys & Astron, 3400 North Charles St, Baltimore, MD 21218 USA (author)
  • Meibom, S.Harvard Smithsonian Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA (author)
  • 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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