HIP 56948: A Solar Twin with a Low Lithium Abundance
Open Access
- 8 October 2007
- journal article
- research article
- Published by American Astronomical Society in The Astrophysical Journal
- Vol. 669 (2), L89-L92
- https://doi.org/10.1086/523942
Abstract
For more than a decade, 18 Sco (HD 146233) has been considered the star that most closely resembles the Sun, even though significant differences such as its Li content, which is about 3 times solar, exist. Using high-resolution, high-S/N spectra obtained at McDonald Observatory, we show that the stars HIP 56948 and HIP 73815 are very similar to the Sun in both stellar parameters and chemical composition, including a low Li abundance, which was previously thought to be peculiar in the Sun. HIP 56948, in particular, has stellar parameters identical to solar within the observational uncertainties, being thus the best solar twin known to date. HIP 56948 is also similar to the Sun in its lack of hot Jupiters. Considering the age of this star (~1 ± 1 Gyr older than the Sun) and its location and orbit around the Galaxy, if terrestrial planets exist around it, they may have had enough time to develop complex life, making it a prime target for SETI.This publication has 24 references indexed in Scilit:
- The Sun-like Activity of the Solar Twin 18 ScorpiiThe Astronomical Journal, 2007
- The colours of the SunMonthly Notices of the Royal Astronomical Society, 2006
- Influence of Gravity Waves on the Internal Rotation and Li Abundance of Solar-Type StarsScience, 2005
- Y 2 Isochrones with an Improved Core Overshoot TreatmentThe Astrophysical Journal Supplement Series, 2004
- Beryllium and Iron Abundances of the Solar Twins 16 Cygni A and BThe Astronomical Journal, 2000
- 110 Herculis: A Possible Prototype for Simultaneous Lithium and Beryllium Depletion, and Implications for Stellar InteriorsThe Astrophysical Journal, 1997
- Stars resembling the SunThe Astronomy and Astrophysics Review, 1996
- The 0.12-2.5 micron Absolute Flux Distribution of the Sun for Comparison With Solar Analog StarsThe Astronomical Journal, 1996
- CA II H and K measurements made at Mount Wilson Observatory, 1966-1983The Astrophysical Journal Supplement Series, 1991
- The Maunder MinimumScience, 1976