Zobrazeno 1 - 10
of 104
pro vyhledávání: '"Buchler, J. Robert"'
Autor:
Buchler, J. Robert, Kollath, Zoltan
Publikováno v:
Astrophysical Journal, 2011, Vol. 731, p. 24-27
The Blazhko effect is a long term, generally irregular modulation of the light curves that occurs in a sizeable number of RR Lyrae stars. The physical origin of the effect has been a puzzle ever since its discovery over a hundred years ago. We build
Externí odkaz:
http://arxiv.org/abs/1101.1502
As shown by Mennickent, et al(2003), a subset of the blue variable stars in the Large Magellanic Cloud exhibit brightness variability of small amplitude in the period range 2.4 to 16 days as well as larger amplitude variability with periods of 140 to
Externí odkaz:
http://arxiv.org/abs/0907.3013
Autor:
Buchler, J. Robert
Publikováno v:
AIP Conf.Proc.1170:51-58,2009
We review the current state of Cepheid modeling and discuss its dominant deficiency, namely the use of time dependent mixing length. Notwithstanding, Cepheid modeling has achieved some excellent successes, and we mention some of the most recent ones.
Externí odkaz:
http://arxiv.org/abs/0907.1766
Publikováno v:
Astrophys.J.698:944-955,2009
A search for variable stars with ultra-low amplitudes (ULA), in the millimag range, has been made in the combined MACHO and OGLE data bases in the broad vicinity of the Cepheid instability strip in the HR diagram. A total of 25 singly periodic and 4
Externí odkaz:
http://arxiv.org/abs/0904.1542
Autor:
Buchler, J. Robert
It is well known that the mere location of a Beat Cepheid model in a Period Ratio \vs Period diagram (Petersen diagram) puts constraints on its metallicity Z. But these bounds are sensitive to the mixture of elements that are lumped into the paramete
Externí odkaz:
http://arxiv.org/abs/0711.2682
We compute the phase lags between the radial velocity curves and the light curves $\Delta \Phi_1= \phi^{V_r}_1 - \phi^{mag}_1$ for classical Cepheid model sequences both in the linear and the nonlinear regimes. The nonlinear phase lags generally fall
Externí odkaz:
http://arxiv.org/abs/astro-ph/0703568
Autor:
Buchler, J. Robert, Szabo, Robert
Publikováno v:
Astrophys.J.660:723-731,2007
The mere location of a Beat Cepheid model in a Period Ratio vs. Period diagram (Petersen diagram) puts very tight constraints on its metallicity Z. The Beat Cepheid Peterson diagrams are revisited with linear nonadiabatic turbulent convective models,
Externí odkaz:
http://arxiv.org/abs/astro-ph/0611809
Autor:
Beaulieu, J. -P., Buchler, J. Robert, Marquette, J. -B., Hartman, J. D., Schwarzenberg-Czerny, A.
Publikováno v:
Astrophys.J.653:L101-L104,2006
Our analysis of the Deep CFHT M33 variability survey database has uncovered 5 Beat Cepheids (BCs) that are pulsating in the fundamental and first overtone modes. With {\it only} the help of stellar pulsation theory and of mass--luminosity (M-L) relat
Externí odkaz:
http://arxiv.org/abs/astro-ph/0610749