Zobrazeno 1 - 10
of 153
pro vyhledávání: '"Guzik, Joyce A."'
Deneb, the prototype alpha Cygni variable, is a blue-white supergiant that shows irregular variability with quasi-period around 12 days in brightness and radial velocity. Abt et al. (2023) found that larger amplitude 12-day variations appear to resum
Externí odkaz:
http://arxiv.org/abs/2410.23985
Deneb (alpha Cygni) is a bright (V magnitude 1.25) blue-white supergiant (spectral type A2 Ia) which shows variability in both radial velocity and photometric measurements. H. Abt reviewed radial velocity measurements by Paddock (1935) using the Lick
Externí odkaz:
http://arxiv.org/abs/2410.23936
An Expanded Set of Los Alamos OPLIB Tables in MESA: Type-1 Rosseland-mean Opacities and Solar Models
Autor:
Farag, Ebraheem, Fontes, Christopher J., Timmes, F. X., Bellinger, Earl P., Guzik, Joyce A., Bauer, Evan B., Wood, Suzannah R., Mussack, Katie, Hakel, Peter, Colgan, James, Kilcrease, David P., Sherrill, Manolo E., Raecke, Tryston C., Chidester, Morgan T.
We present a set of 1194 Type-1 Rosseland-mean opacity tables for four different metallicity mixtures. These new Los Alamos OPLIB atomic radiative opacity tables are an order of magnitude larger in number than any previous opacity table release, and
Externí odkaz:
http://arxiv.org/abs/2406.02845
Autor:
Bhalotia, Vanshree, Huber, Daniel, van Saders, Jennifer L., Metcalfe, Travis S., Stassun, Keivan G., White, Timothy R., Børsen-Koch, Víctor Aguirre, Ball, Warrick H., Basu, Sarbani, Serenelli, Aldo M., Sawczynec, Erica, Guzik, Joyce A., Howard, Andrew W., Isaacson, Howard
Stellar spin down is a critical yet poorly understood component of stellar evolution. In particular, results from the Kepler Mission imply that mature age, solar-type stars have inefficient magnetic braking, resulting in a stalled spin down rate. How
Externí odkaz:
http://arxiv.org/abs/2405.12362
Cepheids have long been used as standard candles to determine distances around the Milky Way and to nearby galaxies. A discrepancy still remains for Hubble Constant determinations using Cepheids vs. the cosmic microwave background or calibrations to
Externí odkaz:
http://arxiv.org/abs/2307.12386
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:
Guzik, Joyce A., Baran, Andrzej S., Sanjayan, Sachu, Németh, Péter, Hedlund, Anne M., Jackiewicz, Jason, Dauelsberg, Lori R.
NGC 6819 is an open cluster of age 2.4 Gyr that was in the NASA Kepler spacecraft field of view from 2009 to 2013. The central part of the cluster was observed in a 200 x 200 pixel `superstamp' during these four years in 30-minute cadence photometry,
Externí odkaz:
http://arxiv.org/abs/2303.01581
Metallic-line A (Am) stars are main-sequence stars of around twice the mass of the Sun that show element abundance peculiarities in their spectra. The radiative levitation and diffusive settling processes responsible for these abundance anomalies sho
Externí odkaz:
http://arxiv.org/abs/2107.09479
Autor:
Evans, Nancy Remage, Pillitteri, Ignazio, Kervella, Pierre, Engle, Scott, Guinan, Edward, Günther, H. Moritz, Wolk, Scott, Neilson, Hilding, Marengo, Massimo, Matthews, Lynn D., Moschou, Sofia, Drake, Jeremy J., Guzik, Joyce A., Gallenne, Alexandre, Mérand, Antoine, Hocdé, Vincent
X-ray bursts have recently been discovered in the Cepheids $\delta$ Cep and $\beta$ Dor modulated by the pulsation cycle. We have obtained an observation of the Cepheid $\eta$ Aql with the XMM-Newton satellite at the phase of maximum radius, the phas
Externí odkaz:
http://arxiv.org/abs/2105.13382
Autor:
Guzik, Joyce Ann
Publikováno v:
Front. Astron. Space Sci. 8, 20 April 2021
The NASA Kepler and follow-on K2 missions (2009-2018) left a legacy of data and discoveries, finding thousands of exoplanets, and also obtaining high-precision long time-series data for hundreds of thousands of stars, including many types of pulsatin
Externí odkaz:
http://arxiv.org/abs/2105.12553