High precision abundances of the old solar twin HIP 102152: Insights on Li depletion from the oldest sun

Talawanda R. Monroe, Jorge Meléndez, Iván Ramírez, David Yong, Maria Bergemann, Martin Asplund, Megan Bedell, Marcelo Tucci Maia, Jacob Bean, Karin Lind, Alan Alves-Brito, Luca Casagrande, Matthieu Castro, José Dias Do Nascimento, Michael Bazot, Fabrício C. Freitas

Research output: Contribution to journalArticlepeer-review

Abstract

We present the first detailed chemical abundance analysis of the old 8.2 Gyr solar twin, HIP 102152. We derive differential abundances of 21 elements relative to the Sun with precisions as high as 0.004 dex (≲1%), using ultra high-resolution (R = 110,000), high S/N UVES spectra obtained on the 8.2 m Very Large Telescope. Our determined metallicity of HIP 102152 is [Fe/H] = -0.013 ± 0.004. The atmospheric parameters of the star were determined to be 54 K cooler than the Sun, 0.09 dex lower in surface gravity, and a microturbulence identical to our derived solar value. Elemental abundance ratios examined versus dust condensation temperature reveal a solar abundance pattern for this star, in contrast to most solar twins. The abundance pattern of HIP 102152 appears to be the most similar to solar of any known solar twin. Abundances of the younger, 2.9 Gyr solar twin, 18 Sco, were also determined from UVES spectra to serve as a comparison for HIP 102152. The solar chemical pattern of HIP 102152 makes it a potential candidate to host terrestrial planets, which is reinforced by the lack of giant planets in its terrestrial planet region. The following non-local thermodynamic equilibrium Li abundances were obtained for HIP 102152, 18 Sco, and the Sun: log ε (Li) = 0.48 ± 0.07, 1.62 ± 0.02, and 1.07 ± 0.02, respectively. The Li abundance of HIP 102152 is the lowest reported to date for a solar twin, and allows us to consider an emerging, tightly constrained Li-age trend for solar twin stars.

Original languageEnglish (US)
Article numberL32
JournalAstrophysical Journal Letters
Volume774
Issue number2
DOIs
StatePublished - Sep 10 2013

Keywords

  • Sun: abundances
  • planetary systems
  • stars: abundances

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Fingerprint Dive into the research topics of 'High precision abundances of the old solar twin HIP 102152: Insights on Li depletion from the oldest sun'. Together they form a unique fingerprint.

Cite this