Zobrazeno 1 - 10
of 294
pro vyhledávání: '"Metcalfe, T. S."'
Autor:
Campante, T. L., Kjeldsen, H., Li, Y., Lund, M. N., Silva, A. M., Corsaro, E., da Silva, J. Gomes, Martins, J. H. C., Adibekyan, V., Silva, T. Azevedo, Bedding, T. R., Bossini, D., Buzasi, D. L., Chaplin, W. J., Costa, R. R., Cunha, M. S., Cristo, E., Faria, J. P., García, R. A., Huber, D., Lundkvist, M. S., Metcalfe, T. S., Monteiro, M. J. P. F. G., Neitzel, A. W., Nielsen, M. B., Poretti, E., Santos, N. C., Sousa, S. G.
Publikováno v:
A&A, 683, L16 (2024)
Fuelled by space photometry, asteroseismology is vastly benefitting the study of cool main-sequence stars, which exhibit convection-driven solar-like oscillations. Even so, the tiny oscillation amplitudes in K dwarfs continue to pose a challenge to s
Externí odkaz:
http://arxiv.org/abs/2403.16333
Autor:
Santos, A. R. G., Mathur, S., García, R. A., Broomhall, A. -M., Egeland, R., Jiménez, A., Godoy-Rivera, D., Breton, S. N., Claytor, Z. R., Metcalfe, T. S., Cunha, M. S., Amard, L.
Publikováno v:
A&A (2023), 672, A56
The photometric time series of solar-like stars can exhibit rotational modulation due to active regions co-rotating with the stellar surface, allowing us to constrain stellar rotation and magnetic activity. In this work we investigate the behavior, p
Externí odkaz:
http://arxiv.org/abs/2304.03165
Autor:
Coffaro, M., Stelzer, B., Orlando, S., Hall, J., Metcalfe, T. S., Wolter, U., Mittag, M., Sanz-Forcada, J., Schneider, P. C., Ducci, L.
Publikováno v:
A&A 636, A49 (2020)
In 2015 we started the XMM-Newton monitoring of the young solar-like star Epsilon Eridani (440 Myr), one of the youngest solar-like stars with a known chromospheric CaII cycle. By analyzing the most recent Mount Wilson S-index CaII data of this star,
Externí odkaz:
http://arxiv.org/abs/2002.11009
Autor:
Santos, A. R. G., García, R. A., Mathur, S., Bugnet, L., van Saders, J. L., Metcalfe, T. S., Simonian, G. V. A., Pinsonneault, M. H.
Brightness variations due to dark spots on the stellar surface encode information about stellar surface rotation and magnetic activity. In this work, we analyze the Kepler long-cadence data of 26,521 main-sequence stars of spectral types M and K in o
Externí odkaz:
http://arxiv.org/abs/1908.05222
Autor:
Santos, A. R. G., Campante, T. L., Chaplin, W. J., Cunha, M. S., van Saders, J. L., Karoff, C., Metcalfe, T. S., Mathur, S., Garcia, R. A., Lund, M. N., Kiefer, R., Aguirre, V. Silva, Davies, G. R., Howe, R., Elsworth, Y.
In the Sun, the properties of acoustic modes are sensitive to changes in the magnetic activity. In particular, mode frequencies are observed to increase with increasing activity level. Thanks to CoRoT and Kepler, such variations have been found in ot
Externí odkaz:
http://arxiv.org/abs/1908.02897
Publikováno v:
A&A 628, A107 (2019)
The periods of rotation and activity cycles are among the most important properties of the magnetic dynamo thought to be operating in late-type, main-sequence stars. In this paper, we present a S$_{\rm{MWO}}$-index time series composed from different
Externí odkaz:
http://arxiv.org/abs/1907.04575
Autor:
Karoff, C., Metcalfe, T. S., Montet, B. T., Jannsen, N. E., Santos, A. R. G., Nielsen, M. B., Chaplin, W. J.
By combining ground-based spectrographic observations of variability in the chromospheric emission from Sun-like stars with the variability seen in their eigenmode frequencies, it is possible to relate the changes observed at the surfaces of these st
Externí odkaz:
http://arxiv.org/abs/1902.02172
Autor:
Schofield, M., Chaplin, W. J., Huber, D., Campante, T. L., Davies, G. R., Miglio, A., Ball, W. H., Appourchaux, T., Basu, S., Bedding, T. R., Christensen-Dalsgaard, J., Creevey, O., Garcia, R. A., Handberg, R., Kawaler, S. D., Kjeldsen, H., Latham, D. W., Lund, M. N., Metcalfe, T. S., Ricker, G. R., Serenelli, A., Aguirre, V. Silva, Stello, D., Vanderspek, R.
We present the target list of solar-type stars to be observed in short-cadence (2-min) for asteroseismology by the NASA Transiting Exoplanet Survey Satellite (TESS) during its 2-year nominal survey mission. The solar-like Asteroseismic Target List (A
Externí odkaz:
http://arxiv.org/abs/1901.10148
Autor:
Salabert, D., Garcia, R. A., Beck, P. G., Regulo, C., Ballot, J., Creevey, O. L., Egeland, R., Nascimento Jr., J. -D. do, Hernandez, F. Perez, Bigot, L., Mathur, S., Metcalfe, T. S., Corsaro, E., Palle, P. L.
Finding solar-analog stars with fundamental properties as close as possible to the Sun and studying the characteristics of their surface magnetic activity is a very promising way to understand the solar variability and its associated dynamo process.
Externí odkaz:
http://arxiv.org/abs/1610.00990
Autor:
White, T. R., Benomar, O., Aguirre, V. Silva, Ball, W. H., Bedding, T. R., Chaplin, W. J., Christensen-Dalsgaard, J., Garcia, R. A., Gizon, L., Stello, D., Aigrain, S., Antia, H. M., Appourchaux, T., Bazot, M., Campante, T. L., Creevey, O. L., Davies, G. R., Elsworth, Y. P., Gaulme, P., Handberg, R., Hekker, S., Houdek, G., Howe, R., Huber, D., Karoff, C., Marques, J. P., Mathur, S., McQuillan, A., Metcalfe, T. S., Mosser, B., Nielsen, M. B., Régulo, C., Salabert, D., Stahn, T.
Publikováno v:
A&A 601, A82 (2017)
Binary star systems are important for understanding stellar structure and evolution, and are especially useful when oscillations can be detected and analysed with asteroseismology. However, only four systems are known in which solar-like oscillations
Externí odkaz:
http://arxiv.org/abs/1609.09581