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An unusually solar-like twin, and the virtue of differential spectroscopy in Galactic studies

An unusually solar-like twin, and the virtue of differential spectroscopy in Galactic studies. Bengt Gustafsson Dept of Astronomy and Astrophysics Uppsala University. Solar Twins. M67. VandenBerg et al. Weiss. M67-1194. Pasquini et al. (2008) Solar-twin candidates in M67. M67-1194.

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An unusually solar-like twin, and the virtue of differential spectroscopy in Galactic studies

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  1. An unusually solar-like twin, and the virtue of differential spectroscopy in Galactic studies Bengt Gustafsson Dept of Astronomy and Astrophysics Uppsala University

  2. Solar Twins

  3. M67

  4. VandenBerg et al.

  5. Weiss

  6. M67-1194

  7. Pasquini et al. (2008)Solar-twin candidates in M67 M67-1194

  8. M67-1194 Sun diff  (Å)

  9. Excitation of Fe I + H => 5780 ± 20 K • Fe I/Fe II + MgIb => log g = 4.44 ± 0.05 (cgs) • t = 0.95 km/s • [Fe/H] = 0.023 ± 0.015

  10. Age • Isochrones (Teffvs log g) by VandenBerg (2010): 4.2 ± 0.3 Gyr If Y is different by 0.01 => 0.2 Gyr • C.f. photometry, Yadav et al. (2008): 3.5 - 4.8 Gyr

  11. + Meléndez et al. (2009) • M67-1194

  12. + Meléndez et al. (2009) • M67-1194 < 6% chance!

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