Zobrazeno 1 - 10
of 129
pro vyhledávání: '"Ness, Melissa K."'
Reconstructing the mass assembly history of the Milky Way relies on obtaining detailed measurements of the properties of many stars in the Galaxy, especially in the stellar halo. One of the most constraining quantities is stellar age, as it can shed
Externí odkaz:
http://arxiv.org/abs/2403.09777
The elemental abundances of stars, particularly the refractory elements (e.g., Fe, Si, Mg), play an important role in connecting stars to their planets. Most Sun-like stars do not have refractory abundance measurements since obtaining a large sample
Externí odkaz:
http://arxiv.org/abs/2402.16954
Autor:
Horta, Danny, Price-Whelan, Adrian M., Hogg, David W., Johnston, Kathryn V., Widrow, Lawrence, Dalcanton, Julianne J., Ness, Melissa K., Hunt, Jason A. S.
Under the assumption of a simple and time-invariant gravitational potential, many Galactic dynamics techniques infer the Milky Way's mass and dark matter distribution from stellar kinematic observations. These methods typically rely on parameterized
Externí odkaz:
http://arxiv.org/abs/2312.07664
Autor:
Manea, Catherine, Hawkins, Keith, Ness, Melissa K., Buder, Sven, Martell, Sarah L., Zucker, Daniel B.
The observed chemical diversity of Milky Way stars places important constraints on Galactic chemical evolution and the mixing processes that operate within the interstellar medium. Recent works have found that the chemical diversity of disk stars is
Externí odkaz:
http://arxiv.org/abs/2310.15257
Autor:
Cunningham, Emily C., Hunt, Jason A. S., Price-Whelan, Adrian M., Johnston, Kathryn V., Ness, Melissa K., Lu, Yuxi, Escala, Ivanna, Stelea, Ioana A.
The stellar stream connected to the Sagittarius (Sgr) dwarf galaxy is the most massive tidal stream that has been mapped in the Galaxy, and is the dominant contributor to the outer stellar halo of the Milky Way. We present metallicity maps of the Sgr
Externí odkaz:
http://arxiv.org/abs/2307.08730
Data-driven models of stellar spectra are useful tools to study non-stellar information, such as the Diffuse Interstellar Bands (DIBs) caused by intervening interstellar material. Using $\sim 55000$ spectra of $\sim 17000$ red clump stars from the AP
Externí odkaz:
http://arxiv.org/abs/2307.05706
Individual abundances in the Milky Way disc record stellar birth properties (e.g. age, birth radius ($R_{\rm birth}$)) and capture the diversity of the star-forming environments over time. Assuming an analytical relationship between ([Fe/H], [$\alpha
Externí odkaz:
http://arxiv.org/abs/2307.04724
Autor:
Huber, Daniel, Pinsonneault, Marc, Beck, Paul, Bedding, Timothy R., Bland-Hawthorn, Joss, Breton, Sylvain N., Bugnet, Lisa, Chaplin, William J., Garcia, Rafael A., Grunblatt, Samuel K., Guzik, Joyce A., Hekker, Saskia, Kawaler, Steven D., Mathis, Stephane, Mathur, Savita, Metcalfe, Travis, Mosser, Benoit, Ness, Melissa K., Piro, Anthony L., Serenelli, Aldo, Sharma, Sanjib, Soderblom, David R., Stassun, Keivan G., Stello, Dennis, Tayar, Jamie, van Belle, Gerard T., Zinn, Joel C.
Asteroseismology has transformed stellar astrophysics. Red giant asteroseismology is a prime example, with oscillation periods and amplitudes that are readily detectable with time-domain space-based telescopes. These oscillations can be used to infer
Externí odkaz:
http://arxiv.org/abs/2307.03237
Autor:
Sayeed, Maryum, Ness, Melissa K., Montet, Benjamin T., Cantiello, Matteo, Casey, Andrew R., Buder, Sven, Bedell, Megan, Breivik, Katelyn, Metzger, Brian D., Martell, Sarah L., McGee-Gold, Leah
Stellar models predict that lithium (Li) inside a star is destroyed during the first dredge-up phase, yet 1.2% of red giant stars are Li-rich. We aim to uncover possible origins of this population, by analysing 1155 Li-rich giants (A(Li) $\geq$ 1.5)
Externí odkaz:
http://arxiv.org/abs/2306.03323
We present Korg, a new package for 1D LTE (local thermodynamic equilibrium) spectral synthesis of FGK stars, which computes theoretical spectra from the near-ultraviolet to the near-infrared, and implements both plane-parallel and spherical radiative
Externí odkaz:
http://arxiv.org/abs/2211.00029