Zobrazeno 1 - 10
of 639
pro vyhledávání: '"Grundahl, F"'
Autor:
Dencs, Z., Derekas, A., Mitnyan, T., Andersen, M. F., Cseh, B., Grundahl, F., Hegedűs, V., Kovács, J., Kriskovics, L., Palle, P. L., Pál, A., Szigeti, L., Mészáros, Sz.
Understanding the atmospheric parameters of stars on the top of the RGB is essential to reveal the chemical composition of the Milky Way, as they can be used to probe the farthest parts of our Galaxy. Our goal is to determine the chemical composition
Externí odkaz:
http://arxiv.org/abs/2404.13176
Publikováno v:
Monthly Notices of the Royal Astronomical Society, Volume 514, Issue 3, pp.4190-4204, August 2022
We present the study on continuous high-resolution spectroscopic observations of two long-period single-lined RS Canum Venaticorum (RS CVn) binary stars IM Pegasi (IM Peg) and $\sigma$ Geminorum ($\sigma$ Gem), obtained with the Hertzsprung SONG tele
Externí odkaz:
http://arxiv.org/abs/2401.02585
Autor:
Brogaard, K., Arentoft, T., Miglio, A., Casali, G., Thomsen, J. S., Tailo, M., Montalbán, J., Grisoni, V., Willett, E., Stokholm, A., Grundahl, F., Stello, D., Sandquist, E. L.
Publikováno v:
A&A 679, A23 (2023)
Asteroseismology of solar-like oscillations in giant stars allow the derivation of their masses and radii. For members of open clusters this allows an age estimate of the cluster which should be identical to the age estimate from the colour-magnitude
Externí odkaz:
http://arxiv.org/abs/2308.12731
Autor:
Knudstrup, E., Lund, M. N., Andersen, M. Fredslund, Rørsted, J. L., Hernández, F. Pérez, Grundahl, F., Pallé, P. L., Stello, D., White, T. R., Kjeldsen, H., Vrard, M., Winther, M. L., Handberg, R., Simón-Díaz, S.
Publikováno v:
A&A 675, A197 (2023)
Fundamental stellar parameters such as mass and radius are some of the most important building blocks in astronomy, both when it comes to understanding the star itself and when deriving the properties of any exoplanet(s) they may host. Asteroseismolo
Externí odkaz:
http://arxiv.org/abs/2306.09769
Autor:
Šubjak, J., Lodieu, N., Kabáth, P., Boffin, H. M. J., Nowak, G., Grundahl, F., Béjar, V. J. S., Osorio, M. R. Zapatero, Antoci, V.
Publikováno v:
A&A 671, A10 (2023)
Aims. The project aims to understand better the role of wide brown dwarf companions on planetary systems. Methods. We obtained high-resolution spectra of six bright stars with co-moving wide substellar companions with the SONG, CARMENES, and STELLA h
Externí odkaz:
http://arxiv.org/abs/2212.03757
Autor:
Brogaard, K., Arentoft, T., Slumstrup, D., Grundahl, F., Lund, M. N., Arndt, L., Grund, S., Rudrasingam, J., Theil, A., Christensen, K., Sejersen, M., Vorgod, F., Salmonsen, L., Endelt, L. Ørtoft, Dainese, S., Frandsen, S., Miglio, A., Tayar, J., Huber, D.
Publikováno v:
A&A 668, A82 (2022)
Eclipsing binary stars with an oscillating giant component allow accurate stellar parameters to be derived and asteroseismic methods to be tested and calibrated. To this aim, suitable systems need to be firstly identified and secondly measured precis
Externí odkaz:
http://arxiv.org/abs/2210.02059
Autor:
Tautvaišienė, G., Mikolaitis, Š., Drazdauskas, A., Stonkutė, E., Minkevičiūtė, R., Pakštienė, E., Kjeldsen, H., Brogaard, K., Chorniy, Y., von Essen, C., Grundahl, F., Ambrosch, M., Bagdonas, V., Sharma, A., Vázquez, C. Viscasillas
In fulfilling the aims of the planetary and asteroseismic research missions, such as that of the NASA Transiting Exoplanet Survey Satellite (TESS) space telescope, accurate stellar atmospheric parameters and a detailed chemical composition are requir
Externí odkaz:
http://arxiv.org/abs/2202.10102
Autor:
Breton, S. N., Pallé, P. L., García, R. A., Andersen, M. Fredslund, Grundahl, F., Christensen-Dalsgaard, J., Kjeldsen, H., Mathur, S.
Publikováno v:
A&A 658, A27 (2022)
The GOLF instrument on board SoHO has been in operation for almost 25 years but aging of the instrument has now strongly affected its performance, especially in the low-frequency p-mode region. At the end of the SoHO mission, the ground-based network
Externí odkaz:
http://arxiv.org/abs/2110.12698
Autor:
Brogaard, K., Grundahl, F., Sandquist, E. L., Slumstrup, D., Jensen, M. L., Thomsen, J. B., Jørgensen, J. H., Larsen, J. R., Bjørn, S. T., Sørensen, C. T. G., Bruntt, H., Arentoft, T., Frandsen, S., Jessen-Hansen, J., Orosz, J. A., Mathieu, R., Geller, A., Ryde, N., Stello, D., Meibom, S., Platais, I.
Publikováno v:
A&A 649, A178 (2021)
Models of stellar structure and evolution can be constrained using accurate measurements of the parameters of eclipsing binary members of open clusters. Multiple binary stars provide the means to tighten the constraints and, in turn, to improve the p
Externí odkaz:
http://arxiv.org/abs/2104.14330
Autor:
Korhonen, H., Roettenbacher, R. M., Gu, S., Grundahl, F., Andersen, M. F., Henry, G. W., Jessen-Hansen, J., Antoci, V., Pallé, P. L.
Publikováno v:
A&A 646, A6 (2021)
Aims: We aim to study the spot evolution and differential rotation in the magnetically active cool K-type giant star sigma Gem from broadband photometry and continuous spectroscopic observations that span 150 nights. Methods: We use high-resolution,
Externí odkaz:
http://arxiv.org/abs/2012.15177