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

This study explores the characteristics of M67-1194, an unusual solar-like twin located in the M67 cluster. Using differential spectroscopy techniques, we analyze key stellar parameters, revealing an effective temperature of 5780 ± 20 K, a surface gravity (log g) of 4.44 ± 0.05, and a metallicity [Fe/H] of 0.023 ± 0.015. The age of M67-1194 is estimated at 4.2 ± 0.3 billion years based on isochrones, suggesting a minimal chance of divergence in stellar evolution. This research highlights the importance of solar twins in understanding galactic studies.

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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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