Zobrazeno 1 - 10
of 158
pro vyhledávání: '"Vandenberg D"'
Properties of the Hyades, the eclipsing binary HD27130, and the oscillating red giant $\epsilon$ Tau
Autor:
Brogaard, K., Pakštienė, E., Grundahl, F., Mikolaitis, Š., Tautvaišienė, G., Slumstrup, D., Talens, G. J. J., VandenBerg, D. A., Miglio, A., Arentoft, T., Kjeldsen, H., Janulis, R., Drazdauskas, A., Marchini, A., Minkevičiūtė, R., Stonkutė, E., Bagdonas, V., Andersen, M. Fredslund, Jessen-Hansen, J., Pallé, P. L., Dorval, P., Snellen, I. A. G., Otten, G. P. P. L., White, T. R.
Publikováno v:
A&A 645, A25 (2021)
Eclipsing binary stars allow derivation of accurate and precise masses and radii. When they reside in star clusters, properties of even higher precision, along with additional information, can be extracted. Asteroseismology of solar-like oscillations
Externí odkaz:
http://arxiv.org/abs/2011.02274
Autor:
Topcu, G. Böcek, Afsar, M., Sneden, C., Pilachowski, C. A., Denissenkov, P. A., VandenBerg, D. A., Wright, D., Mace, G. N., Jaffe, D. T., Strickland, E., Kim, H., Sokal, K. R.
We present a detailed near-infrared chemical abundance analysis of 10 red giant members of the Galactic open cluster NGC 752. High-resolution (R$\simeq$45000) near-infrared spectral data were gathered with the Immersion Grating Infrared Spectrograph
Externí odkaz:
http://arxiv.org/abs/1910.10554
Autor:
Topcu, G. Böcek, Afsar, M., Sneden, C., Pilachowski, C. A., Denissenkov, P. A., VandenBerg, D. A., Strickland, E., Özdemir, S., Mace, G. N., Kim, H., Jaffe, D. T.
We present near-infrared spectroscopic analysis of 12 red giant members of the Galactic open cluster NGC 6940. High-resolution (R$\simeq$45000) and high signal-to-noise ratio (S/N > 100) near-infrared H and K band spectra were gathered with the Immer
Externí odkaz:
http://arxiv.org/abs/1903.03786
Autor:
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 NGC6791. We identify the system to be a blue straggler cluster member by using a combination of ground-based and Kepler photometry and multi-epoch spectroscopy. The propertie
Externí odkaz:
http://arxiv.org/abs/1809.00705
Autor:
Brown, T. M., Casertano, S., Strader, J., Riess, A., VandenBerg, D. A., Soderblom, D. R., Kalirai, J., Salinas, R.
Using the Wide Field Camera 3 (WFC3) on the Hubble Space Telescope (HST), we have obtained a direct trigonometric parallax for the nearest metal-poor globular cluster, NGC 6397. Although trigonometric parallaxes have been previously measured for many
Externí odkaz:
http://arxiv.org/abs/1803.02927
Our aim is to derive a self-consistent age, distance and composition for the globular cluster $47\,$Tucanae ($47\,$Tuc; NGC104). First, we reevaluate the reddening towards the cluster resulting in a nominal $E(B-V)=0.03\pm0.01$ as the best estimate.
Externí odkaz:
http://arxiv.org/abs/1702.03421
Autor:
Geha, M., Brown, T. M., Tumlinson, J., Kalirai, J., Simon, J. D., Kirby, E., VandenBerg, D., Munoz, R. M., Avila, R., Guhathakurta, P., Ferguson, H.
We present constraints on the stellar initial mass function (IMF) in two ultra-faint dwarf (UFD) galaxies, Hercules and Leo IV, based on deep HST/ACS imaging. The Hercules and Leo IV galaxies are extremely low luminosity (M_V = -6.2, -5.5), metal-poo
Externí odkaz:
http://arxiv.org/abs/1304.7769
Autor:
Brogaard, K., VandenBerg, D. A., Bruntt, H., Grundahl, F., Frandsen, S., Bedin, L. R., Milone, A. P., Dotter, A., Feiden, G. A., Stetson, P. B., Sandquist, E., Miglio, A., Stello, D., Jessen-Hansen, J.
Models of stellar structure and evolution can be constrained by measuring accurate parameters of detached eclipsing binaries in open clusters. Multiple binary stars provide the means to determine helium abundances in these old stellar systems, and in
Externí odkaz:
http://arxiv.org/abs/1205.4071
Autor:
Brogaard, K., Bruntt, H., Grundahl, F., Clausen, J. V., Frandsen, S., VandenBerg, D. A., Bedin, L. R.
Earlier measurements of the masses and radii of the detached eclipsing binary V20 in the open cluster NGC 6791 were accurate enough to demonstrate that there are significant differences between current stellar models. Here we improve on those results
Externí odkaz:
http://arxiv.org/abs/1009.5537
Autor:
Bono, G., Stetson, P. B., VandenBerg, D. A., Calamida, A., Dall'Ora, M., Iannicola, G., Amico, P., Di Cecco, A., Marchetti, E., Monelli, M., Sanna, N., Walker, A. R., Zoccali, M., Buonanno, R., Caputo, F., Degl'Innocenti, S., D'Odorico, S., Ferraro, I., Gilmozzi, R., Melnick, J., Nonino, M., Ortolani, S., Piersimoni, A. M., Moroni, P. G. Prada, Pulone, L., Romaniello, M., Storm, J.
We present a new method to estimate the absolute ages of stellar systems. This method is based on the difference in magnitude between the main sequence turn-off (MSTO) and a well defined knee located along the lower main sequence (MSK). This feature
Externí odkaz:
http://arxiv.org/abs/0912.0824