Stellar Population Astrophysics (SPA) with TNG, Fluorine abundances in seven open clusters
arxiv(2024)
摘要
The age, evolution, and chemical properties of the Galactic disk can be
effectively ascertained using open clusters. Within the large program Stellar
Populations Astrophysics at the Telescopio Nazionale Galileo, we specifically
focused on stars in open clusters, to investigate various astrophysical topics,
from the chemical content of very young systems to the abundance patterns of
lesser studied intermediate-age and old open clusters. We investigate the
astrophysically interesting element fluorine (F), which has an uncertain and
intriguing cosmic origin. We also determine the abundance of cerium (Ce), as F
abundance is expected to correlate with the s-process elements. High-resolution
near-infrared spectra were obtained using the GIANO-B spectrograph. The Python
version of Spectroscopy Made Easy (PySME), was used to derive atmospheric
parameters and abundances. The stellar parameters were determined using OH, CN,
and CO molecular lines along with Fe I lines. This paper presents the first F
Galactic radial abundance gradient. Our results are also compared with
literature estimates and with Galactic chemical evolution models that have been
generated using different F production channels. Our results indicate a
constant, solar pattern in the [F/Fe] ratios across clusters of different ages,
supporting the latest findings that fluorine levels do not exhibit any
secondary behavior for stars with solar or above-solar metallicity. By
comparing our sample stars with the predictions of Galactic chemical evolution
models, we came to the conclusion that both asymptotic giant branch stars and
massive stars, including a fraction of fast rotators that increase with
decreasing metallicity, are needed to explain the cosmic origin of F.
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