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The blue straggler ...
The blue straggler V106 in NGC 6791 : a prototype progenitor of old single giants masquerading as young
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- Brogaard, K. (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, England
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- Christiansen, S. M. (author)
- Aarhus Univ, Stellar Astrophys Ctr, Dept Phys & Astron, Ny Munkegade 120, DK-8000 Aarhus C, Denmark
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- Grundahl, F. (author)
- Aarhus Univ, Stellar Astrophys Ctr, Dept Phys & Astron, Ny Munkegade 120, DK-8000 Aarhus C, Denmark
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- Miglio, A. (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, England
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- Izzard, R. G. (author)
- Univ Surrey, Fac Engn & Phys Sci, Astrophys Res Grp, Guildford GU2 7XH, Surrey, England
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- Tauris, T. M. (author)
- 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
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- Sandquist, E. L. (author)
- San Diego State Univ, Dept Astron, San Diego, CA 92182 USA
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- VandenBerg, D. A. (author)
- Univ Victoria, Dept Phys & Astron, POB 1700 STN CSC, Victoria, BC V8W 2Y2, Canada
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- Jessen-Hansen, J. (author)
- Aarhus Univ, Stellar Astrophys Ctr, Dept Phys & Astron, Ny Munkegade 120, DK-8000 Aarhus C, Denmark
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- Arentoft, T. (author)
- Aarhus Univ, Stellar Astrophys Ctr, Dept Phys & Astron, Ny Munkegade 120, DK-8000 Aarhus C, Denmark
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- Bruntt, H. (author)
- Aarhus Univ, Stellar Astrophys Ctr, Dept Phys & Astron, Ny Munkegade 120, DK-8000 Aarhus C, Denmark
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- Frandsen, S. (author)
- Aarhus Univ, Stellar Astrophys Ctr, Dept Phys & Astron, Ny Munkegade 120, DK-8000 Aarhus C, Denmark
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- Orosz, J. A. (author)
- San Diego State Univ, Dept Astron, San Diego, CA 92182 USA
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- Feiden, Gregory A., 1986- (author)
- Uppsala universitet,Teoretisk astrofysik
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- Mathieu, R. (author)
- Univ Wisconsin, Dept Astron, Madison, WI 53706 USA
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- Geller, A. (author)
- Univ Wisconsin, Dept Astron, Madison, WI 53706 USA
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- Shetrone, M. (author)
- Univ Texas, McDonald Observ, HC75 Box 1337-L, Ft Davis, TX 79734 USA
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- Ryde, N. (author)
- Lund Univ, Lund Observ, Dept Astron & Theoret Phys, Box 43, SE-22100 Lund, Sweden
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- Stello, D. (author)
- 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
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- Platais, I. (author)
- Johns Hopkins Univ, Dept Phys & Astron, 3400 North Charles St, Baltimore, MD 21218 USA
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- Meibom, S. (author)
- Harvard Smithsonian Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA
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(creator_code:org_t)
- 2018-09-18
- 2018
- English.
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In: Monthly notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 481:4, s. 5062-5072
- Related links:
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https://arxiv.org/pd...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Subject headings
Close
- 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.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- binaries: close
- blue stragglers
- stars: fundamental parameters
- stars: individual V106
- white dwarfs
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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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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show more...
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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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Uppsala University