Zobrazeno 1 - 10
of 155
pro vyhledávání: '"Stellar ages"'
Autor:
Keivan G. Stassun, Marina Kounkel
Publikováno v:
The Astrophysical Journal Letters, Vol 967, Iss 2, p L36 (2024)
We have assembled a sample of ∼8200 stars with spectral types F5V–M5V, all having directly measured X-ray luminosities from eROSITA and rotation periods from TESS and having empirically estimated ages via their membership in stellar clusters and
Externí odkaz:
https://doaj.org/article/a77a088117984f629d5d50cce1a22547
Publikováno v:
The Astrophysical Journal, Vol 977, Iss 1, p 103 (2024)
Blanco 1 is an ≈130 Myr open cluster located 240 pc from the Sun, below the Galactic plane. Recent studies have reported the existence of diffuse tidal tails extending 50–60 pc from the cluster center based on the positions and velocities measure
Externí odkaz:
https://doaj.org/article/a006895f6a284e0790794571342811b9
Autor:
Sheila Sagear, Adrian M. Price-Whelan, Sarah Ballard, Yuxi (Lucy) Lu, Ruth Angus, David W. Hogg
Publikováno v:
The Astrophysical Journal, Vol 977, Iss 1, p 49 (2024)
Stellar age measurements are fundamental to understanding a wide range of astronomical processes, including Galactic dynamics, stellar evolution, and planetary system formation. However, extracting age information from main-sequence stars is complica
Externí odkaz:
https://doaj.org/article/6afc0106c1de4162a7fb29972bbf73fa
Autor:
C. Clontz, A. C. Seth, A. Dotter, M. Häberle, M. S. Nitschai, N. Neumayer, A. Feldmeier-Krause, M. Latour, Z. Wang, S. O. Souza, N. Kacharov, A. Bellini, M. Libralato, R. Pechetti, G. van de Ven, M. Alfaro-Cuello
Publikováno v:
The Astrophysical Journal, Vol 977, Iss 1, p 14 (2024)
We present age estimates for over 8100 subgiant branch (SGB) stars in Omega Centauri ( ω Cen) to study its star formation history. Our large data set, which combines multi-wavelength Hubble Space Telescope photometry with MUSE metallicities, provide
Externí odkaz:
https://doaj.org/article/81fcf49a2295498c916b8d6062a1ee56
Autor:
Federica Chiti, Jennifer L. van Saders, Tyler M. Heintz, J. J. Hermes, J. M. Joel Ong, Daniel R. Hey, Michele M. Ramirez-Weinhouse, Alison Dugas
Publikováno v:
The Astrophysical Journal, Vol 977, Iss 1, p 15 (2024)
Gyrochronology, a valuable tool for determining ages of low-mass stars where other techniques fail, relies on accurate calibration. We present a sample of 185 wide (>100 au) white dwarf + main sequence (WD + MS) binaries. Total ages of WDs are comput
Externí odkaz:
https://doaj.org/article/8575382eae7d45e18bbb3b1ee4227d6c
Autor:
Luke G. Bouma, Lynne A. Hillenbrand, Andrew W. Howard, Howard Isaacson, Kento Masuda, Elsa K. Palumbo
Publikováno v:
The Astrophysical Journal, Vol 976, Iss 2, p 234 (2024)
Recent analyses of FGK stars in open clusters have helped clarify the precision with which a star’s rotation rate and lithium content can be used as empirical indicators for its age. Here we apply this knowledge to stars observed by Kepler. Rotatio
Externí odkaz:
https://doaj.org/article/478a5662f05542b39dbff0460b523d7e
Publikováno v:
The Astronomical Journal, Vol 168, Iss 6, p 282 (2024)
Gaia characterizes the stellar populations of nearby open clusters with unprecedented precision. We investigate the Böhm-Vitense gap, which has been found as a prominent feature in the stellar sequence of open clusters. Using PARSEC isochrone fittin
Externí odkaz:
https://doaj.org/article/1bc459281414412cb09c3866c1440c6e
Autor:
Guido Roberts-Borsani, Tommaso Treu, Alice Shapley, Adriano Fontana, Laura Pentericci, Marco Castellano, Takahiro Morishita, Pietro Bergamini, Piero Rosati
Publikováno v:
The Astrophysical Journal, Vol 976, Iss 2, p 193 (2024)
The exceptional spectra of the most luminous z > 10 sources observed so far have challenged our understanding of early galaxy evolution, requiring a new observational benchmark for meaningful interpretation. As such, we construct spectroscopic templa
Externí odkaz:
https://doaj.org/article/65742dbbc9ac411fbed20f66707b1119
Publikováno v:
The Astronomical Journal, Vol 168, Iss 6, p 277 (2024)
With Gaia, APOGEE, GALAH, and LAMOST data, we investigate the positional, kinematic, chemical, and age properties of nine moving groups in the solar neighborhood. We find that each moving group has a distinct distribution in the velocity space in ter
Externí odkaz:
https://doaj.org/article/41a4217824694deb8661268c5f28a0e1
Publikováno v:
The Astrophysical Journal, Vol 976, Iss 1, p 87 (2024)
Age is the most difficult fundamental stellar parameter to infer for isolated stars. While isochrone-based ages are in general imprecise for both main-sequence dwarfs and red giants, precise isochrone-based ages can be obtained for stars on the subgi
Externí odkaz:
https://doaj.org/article/d68b0bf06b024192a680427ceb5f6b14