TY - JOUR
T1 - HIP 56948
T2 - A solar twin with a low lithium abundance
AU - Mélendez, Jorge
AU - Ramírez, Iván
PY - 2007
Y1 - 2007
N2 - 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.
AB - 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.
KW - Stars: abundances
KW - Stars: activity
KW - Stars: atmospheres
KW - Stars: fundamental parameters
KW - Stars: individual (HIP 56948)
KW - Sun: fundamental parameters
UR - http://www.scopus.com/inward/record.url?scp=44849112317&partnerID=8YFLogxK
U2 - 10.1086/523942
DO - 10.1086/523942
M3 - Article
SN - 0004-637X
VL - 669
SP - L89-L92
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 2 PART 2
ER -