Search Results - "Grundahl, F."

Magnetic activities on two single-lined RS Canum Venaticorum binaries IM Pegasi and σ Geminorum by Cao, Dongtao, Gu, Shenghong, Grundahl, F, Pallé, P L

“…ABSTRACT We present the study on continuous high-resolution spectroscopic observations of two long-period single-lined RS Canum Venaticorum (RS CVn) binary…”
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Establishing the accuracy of asteroseismic mass and radius estimates of giant stars – I. Three eclipsing systems at [Fe/H] ∼ −0.3 and the need for a large high-precision sample by Brogaard, K, Hansen, C J, Miglio, A, Slumstrup, D, Frandsen, S, Jessen-Hansen, J, Lund, M N, Bossini, D, Thygesen, A, Davies,  G R, Chaplin, W J, Arentoft, T, Bruntt, H, Grundahl, F, Handberg, R

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The SUMO project I. A survey of multiple populations in globular clusters by Monelli, M., Milone, A. P., Stetson, P. B., Marino, A. F., Cassisi, S., del Pino Molina, A., Salaris, M., Aparicio, A., Asplund, M., Grundahl, F., Piotto, G., Weiss, A., Carrera, R., Cebrián, M., Murabito, S., Pietrinferni, A., Sbordone, L.

“…We present a general overview and the first results of the SUMO project (a SUrvey of Multiple pOpulations in Globular Clusters). The objective of this survey…”
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Detection of solar-like oscillations in relics of the Milky Way: asteroseismology of K giants in M4 using data from the NASA K2 mission by Miglio, A., Chaplin, W. J., Brogaard, K., Lund, M. N., Mosser, B., Davies, G. R., Handberg, R., Milone, A. P., Marino, A. F., Bossini, D., Elsworth, Y. P., Grundahl, F., Arentoft, T., Bedin, L. R., Campante, T. L., Jessen-Hansen, J., Jones, C. D., Kuszlewicz, J. S., Malavolta, L., Nascimbeni, V., Sandquist, E. L.

“…Asteroseismic constraints on K giants make it possible to infer radii, masses and ages of tens of thousands of field stars. Tests against independent estimates…”
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A WFC3/ HST VIEW OF THE THREE STELLAR POPULATIONS IN THE GLOBULAR CLUSTER NGC 6752 by Milone, A P, Marino, A F, Piotto, G, Bedin, L R, Anderson, J, Aparicio, A, Bellini, A, Cassisi, S, D'Antona, F, Grundahl, F, Monelli, M, Yong, D

“…Multi-band Hubble Space Telescope photometry reveals that the main sequence, sub-giant, and the red-giant branch of the globular cluster NGC 6752 splits into…”
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Conducting the SONG: The Robotic Nature and Efficiency of a Fully Automated Telescope by Andersen, M. Fredslund, Handberg, R., Weiss, E., Frandsen, S., Simón-Díaz, S., Grundahl, F., Pallé, P.

“…We present a description of "the Conductor," an automated software package that handles all observations at the first Stellar Observations Network Group (SONG)…”
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First Results from the Hertzsprung SONG Telescope: Asteroseismology of the G5 Subgiant Star μ Herculis by Grundahl, F., Andersen, M. Fredslund, Christensen-Dalsgaard, J., Antoci, V., Kjeldsen, H., Handberg, R., Houdek, G., Bedding, T. R., Pallé, P. L., Jessen-Hansen, J., Aguirre, V. Silva, White, T. R., Frandsen, S., Albrecht, S., Andersen, M. I., Arentoft, T., Brogaard, K., Chaplin, W. J., Harpsøe, K., Jørgensen, U. G., Karovicova, I., Karoff, C., Rasmussen, P. Kjærgaard, Lund, M. N., Lundkvist, M. Sloth, Skottfelt, J., Norup Sørensen, A., Tronsgaard, R., Weiss, E.

“…Abstract We report the first asteroseismic results obtained with the Hertzsprung Stellar Observations Network Group Telescope from an extensive high-precision…”
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Asteroseismology of old open clusters with Kepler: direct estimate of the integrated red giant branch mass-loss in NGC 6791 and 6819 by Miglio, A., Brogaard, K., Stello, D., Chaplin, W. J., D'Antona, F., Montalbán, J., Basu, S., Bressan, A., Grundahl, F., Pinsonneault, M., Serenelli, A. M., Elsworth, Y., Hekker, S., Kallinger, T., Mosser, B., Ventura, P., Bonanno, A., Noels, A., Silva Aguirre, V., Szabo, R., Li, J., McCauliff, S., Middour, C. K., Kjeldsen, H.

“…Mass-loss of red giant branch (RGB) stars is still poorly determined, despite its crucial role in the chemical enrichment of galaxies. Thanks to the recent…”
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Atomic Diffusion and Mixing in Old Stars. I. Very Large Telescope FLAMES-UVES Observations of Stars in NGC 6397 by Korn, A. J, Grundahl, F, Richard, O, Mashonkina, L, Barklem, P. S, Collet, R, Gustafsson, B, Piskunov, N

“…We present a homogeneous photometric and spectroscopic analysis of 18 stars along the evolutionary sequence of the metal-poor globular cluster NGC 6397 ([Fe/H]…”
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Testing asteroseismic scaling relations using eclipsing binaries in star clusters and the field by Brogaard, K., Jessen-Hansen, J., Handberg, R., Arentoft, T., Frandsen, S., Grundahl, F., Bruntt, H., Sandquist, E. L., Miglio, A., Beck, P. G., Thygesen, A. O., Kjærgaard, K. L., Haugaard, N. A.

“…The accuracy of stellar masses and radii determined from asteroseismology is not known! We examine this issue for giant stars by comparing classical…”
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Establishing the accuracy of asteroseismic mass and radius estimates of giant stars – II. Revised stellar masses and radii for KIC 8430105 by Thomsen, J S, Brogaard, K, Arentoft, T, Slumstrup, D, Lund, M N, Grundahl, F, Miglio, A, Jessen-Hansen, J, Frandsen, S

“…ABSTRACT Asteroseismic scaling relations can provide high-precision measurements of mass and radius for red giant (RG) stars displaying solar-like…”
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The blue straggler V106 in NGC 6791: a prototype progenitor of old single giants masquerading as young by Brogaard, K, Christiansen, S M, Grundahl, F, Miglio, A, Izzard, R G, Tauris, T M, Sandquist, E L, VandenBerg, D A, Jessen-Hansen, J, Arentoft, T, Bruntt, H, Frandsen, S, Orosz, J A, Feiden, G A, Mathieu, R, Geller, A, Shetrone, M, Ryde, N, Stello, D, Platais, I, Meibom, S

“…We determine the properties of the binary star V106 in the old open cluster NGC 6791. We identify the system to be a blue straggler cluster member by using a…”
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Extremely precise age and metallicity of the open cluster NGC 2506 using detached eclipsing binaries by Knudstrup, E, Grundahl, F, Brogaard, K, Slumstrup, D, Orosz, J A, Sandquist, E L, Jessen-Hansen, J, Lund, M N, Arentoft, T, Tronsgaard, R, Yong, D, Frandsen, S, Bruntt, H

“…ABSTRACT Accurate stellar parameters of stars in open clusters can help constrain models of stellar structure and evolution. Here, we wish to determine the age…”
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Spectroscopic study of the open cluster NGC 6811 by Molenda-Żakowicz, J., Brogaard, K., Niemczura, E., Bergemann, M., Frasca, A., Arentoft, T., Grundahl, F.

“…The NASA space telescope Kepler has provided unprecedented time series observations which have revolutionized the field of asteroseismology, i.e. the use of…”
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Chemical Composition of Bright Stars in the Northern Hemisphere: Star–Planet Connection by 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

“…Abstract In fulfilling the aims of the planetary and asteroseismic research missions, such as that of the NASA Transiting Exoplanet Survey Satellite (TESS)…”
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A probable stellar solution to the cosmological lithium discrepancy by Richard, O, Barklem, P. S, Korn, A. J, Gustafsson, B, Collet, R, Grundahl, F, Mashonkina, L, Piskunov, N

“…The measurement of the cosmic microwave background has strongly constrained the cosmological parameters of the Universe. When the measured density of baryons…”
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Sounding stellar cycles with Kepler - II. Ground-based observations by Karoff, C., Metcalfe, T. S., Chaplin, W. J., Frandsen, S., Grundahl, F., Kjeldsen, H., Christensen-Dalsgaard, J., Nielsen, M. B., Frimann, S., Thygesen, A. O., Arentoft, T., Amby, T. M., Sousa, S. G., Buzasi, D. L.

“…We have monitored 20 Sun-like stars in the Kepler field-of-view for excess flux with the Fibre-fed Echelle Spectrograph on the Nordic Optical Telescope since…”
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Strömgren Photometry of Galactic Globular Clusters. I. New Calibrations of the Metallicity Index by Calamida, A, Bono, G, Stetson, P. B, Freyhammer, L. M, Cassisi, S, Grundahl, F, Pietrinferni, A, Hilker, M, Primas, F, Richtler, T, Romaniello, M, Buonanno, R, Caputo, F, Castellani, M, Corsi, C. E, Ferraro, I, Iannicola, G, Pulone, L

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Withdrawn as Duplicate: Detection of solar-like oscillations in relics of the Milky Way: asteroseismology of K giants in M4 using data from the NASA K2 mission by Miglio, A, Chaplin, W J, Brogaard, K, Lund, M N, Mosser, B, Davies, G R, Handberg, R, Milone, A P, Marino, A F, Bossini, D, Elsworth, Y P, Grundahl, F, Arentoft, T, Bedin, L R, Campante, T L, Jessen-Hansen, J, Jones, C D, Kuszlewicz, J S, Malavolta, L, Nascimbeni, V, Sandquist, E L

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Benefits of multiple sites for asteroseismic detections by Arentoft, T., Tingley, B., Christensen-Dalsgaard, J., Kjeldsen, H., White, T. R., Grundahl, F.

“…While Kepler has pushed the science of asteroseismology to limits unimaginable a decade ago, the need for asteroseismic studies of individual objects remains…”
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