Age determination of galaxy merger remnant stars using asteroseismology
نویسندگان
چکیده
The Milky Way was shaped by the mergers with several galaxies in past. We search for remnant stars that were born these foreign and assess their ages an effort to put upper limits on merger times thereby better understand evolutionary history of our Galaxy. Using 6D-phase space information from Gaia eDR3 chemical APOGEE DR16, we kinematically chemically select $23$ red giant belonging former dwarf merged Way. With added asteroseismology Kepler K2, determine ex-situ $55$ in-situ great precision. find all are consistent being older than $8$ Gyr. While it is not possible associate a specific galaxy classify eight them as Gaia-Enceladus/Sausage stars, which one most massive Galaxy's history. mean age be $9.5^{+1.2}_{-1.3}$ Gyr time $8$-$10$ ago. rest possibly associated Kraken, Thamnos, Sequoia, or another extragalactic progenitor. determination paves way more accurately pinning down when events occurred hence provide tight constraints useful simulating how unfolded.
منابع مشابه
Determination of Remnant Merger Stage of Equal-Mass Disk Galaxies
There are many examples of merging galaxy found in observational astronomy, yet the timescales on which merging happens do not allow for one to study the evolution of galaxy merging of any one merger. Furthermore, there are no standard techniques for the identification of the stage of a galaxy mergers progress in the merging process. In this paper, simulations of merging galaxies are analyzed f...
متن کاملAsteroseismology of Sun-like Stars
In the past decade, helioseismology has revolutionized our understanding of the interior structure of the Sun. In the next decade, asteroseismology will place this knowledge into context, by providing structural information for dozens of pulsating stars across the H-R diagram. Solar-like oscillations have already been detected from the ground in a few stars, and several current and planned sate...
متن کاملAsteroseismology of close binary stars
In this review paper, we summarise the goals of asteroseismic studies of close binary stars. We first briefly recall the basic principles of asteroseismology, and highlight how the binarity of a star can be an asset, but also a complication, for the interpretation of the stellar oscillations. We discuss a few sample studies of pulsations in close binaries and summarise some case studies. This l...
متن کاملAsteroseismology of Exoplanets-host Stars
Studying the internal structure of exoplanets-host stars compared to that of similar stars without detected planets is particularly important for the understanding of planetary formation. The observed overmetallicity of stars around which planets have been detected may be a hint in that respect. In this framework, asteroseismic studies represent an excellent tool to determine the structural dif...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2022
ISSN: ['0035-8711', '1365-8711', '1365-2966']
DOI: https://doi.org/10.1093/mnras/stac1498