Zobrazeno 1 - 10
of 208
pro vyhledávání: '"Kurtz, Donald W."'
Autor:
Guo, Zhao, Bedding, Timothy R., Pamyatnykh, A. A., Kurtz, Donald W., Li, Gang, Gautam, Anuj, Murphy, Simon J., Aerts, Conny
We find that the observed pressure-mode rotational splittings of slowly/moderately rotating Delta Scuti stars and Beta Cephei stars mostly have a positive asymmetry. That is, the left frequency spacing is larger than the right spacing in the dipole m
Externí odkaz:
http://arxiv.org/abs/2406.15678
Autor:
Henriksen, Andreea I., Antoci, Victoria, Saio, Hideyuki, Cantiello, Matteo, Kjeldsen, Hans, Kurtz, Donald W., Murphy, Simon J., Mathur, Savita, García, Rafael A., Santos, Ângela R. G.
The Kepler mission revealed a plethora of stellar variability in the light curves of many stars, some associated with magnetic activity or stellar oscillations. In this work, we analyse the periodic signal in 162 intermediate-mass stars, interpreted
Externí odkaz:
http://arxiv.org/abs/2301.04974
Autor:
Jayaraman, Rahul, Handler, Gerald, Rappaport, Saul, Fuller, Jim, Kurtz, Donald W., Charpinet, Stéphane, Ricker, George
Tidally tilted pulsators (TTPs) are an intriguing new class of oscillating stars in binary systems; in such stars, the pulsation axis coincides with the line of apsides, or semi-major axis, of the binary. All three TTPs discovered so far have been $\
Externí odkaz:
http://arxiv.org/abs/2203.04970
Autor:
Saio, Hideyuki, Kurtz, Donald W.
R-mode oscillations in a rotating star produce characteristic signatures in a Fourier amplitude spectrum at frequencies related with the rotation frequency, which can be, in turn, used to obtain the surface rotation rate of the star. Some binary star
Externí odkaz:
http://arxiv.org/abs/2201.02458
The tidally tilted pulsators are a new type of oscillating star in close binary systems that have their pulsation axis in the orbital plane because of the tidal distortion caused by their companion. We describe this group of stars on the basis of the
Externí odkaz:
http://arxiv.org/abs/2201.01722
Autor:
Jayaraman, Rahul, Hubrig, Swetlana, Holdsworth, Daniel L., Schöller, Markus, Järvinen, Silva, Kurtz, Donald W., Ricker, George R.
We report the detection and characterization of a new magnetospheric star, HD 135348, based on photometric and spectropolarimetric observations. The TESS light curve of this star exhibited variations consistent with stars known to possess rigidly rot
Externí odkaz:
http://arxiv.org/abs/2112.07676
Autor:
Jayaraman, Rahul, Rappaport, Saul, Nelson, Lorne, Kurtz, Donald W., Dufresne, George, Handler, Gerald, Senhadji, Abdel, Latham, David W., Zhou, George, Bieryla, Allyson, Ricker, George
Using TESS 20-sec cadence data, we have discovered an unusual combination of pulsating stars in what we infer to be a binary system. The binary consists of a standard $\delta$ Scuti star with pulsations over the range 32-41 d$^{-1}$; this is in a lik
Externí odkaz:
http://arxiv.org/abs/2111.12098
We present two new rapidly oscillating Ap (roAp) stars, TIC 198781841 and TIC 229960986, discovered in TESS photometric data. The periodogram of TIC 198781841 has a large peak at 166.506 d$^{-1}$ (1.93 mHz), with two nearby peaks at 163.412 d$^{-1}$
Externí odkaz:
http://arxiv.org/abs/2111.09352
Publikováno v:
Astrophysical Journal, 871, pp 135-145, 2019
The two-dimensional internal rotation of KIC11145123 has been inferred via asteroseismology. Based on the Optimally Localized Averaging method and a simple three-zone modeling of the internal rotation, we have found evidence for a contrast between th
Externí odkaz:
http://arxiv.org/abs/2111.06853
Autor:
Shi, Fangfei, Kurtz, Donald W., Holdsworth, Daniel L., Saio, Hideyuki, Cunha, Margarida S., Zhang, Huawei, Fu, Jianning, Handler, G.
We report the frequency analysis of a known roAp star, HD 86181 (TIC 469246567), with new inferences from TESS data. We derive the rotation frequency to be $\nu_{rot}$ = 0.48753 $\pm$ 0.00001d$^{-1}$. The pulsation frequency spectrum is rich, consist
Externí odkaz:
http://arxiv.org/abs/2107.12204