Saint Mary's Faculty Articles and Other Works: Recent submissions

Now showing items 681-700 of 766

Order results for mono-implicit Runge-Kutta methods

Burrage, K.; Chipman, F. H.; Muir, Paul H. (Society for Industrial and Applied Mathematics, 1994-06)

The mono-implicit Runge-Kutta methods are a subclass of the well-known implicit Runge-Kutta methods and have application in the efficient numerical solution of systems of initial and boundary value ordinary differential ...
Order barriers and characterizations for continuous mono-implicit Runge-Kutta schemes

Muir, Paul H.; Owren, Brynjulf (American Mathematical Society, 1993-10)

The mono-implicit Runge-Kutta (MIRK) schemes, a subset of the family of implicit Runge-Kutta (IRK) schemes, were originally proposed for the numerical solution of initial value ODEs more than fifteen years ago. During the ...
A common fixed-point theorem in reflexive locally uniformly convex Banach spaces

Edelstein, Michael; Kiang, Mo Tak (American Mathematical Society, 1985-07)

Let X be a reflexive locally uniformly convex Banach space and G an ultimately nonexpansive commutative semigroup of continuous self-maps of X. If there exists a point x in X recurrent under G such that G(x) is bounded, ...
Pulsation analysis of V 588 MON AND V 589 MON observed with the MOST AND CoRoT satellites

Zwintz, K.; Kallinger, T.; Guenther, David B.; Gruberbauer, Michael; Kuschnig, R.; Weiss, W. W.; Auvergne, M.; Jorda, L.; Favata, F.; Matthews, J.; Fischer, M. (American Astronomical SocietyIOP Publishing, 2011-03-01)

The two pulsating pre-main sequence (PMS) stars V 588 Mon and V 589 Mon were observed by CoRoT for 23.4 days in 2008 March during the Short Run SRa01 and in 2004 and 2006 by MOST for a total of ∼70 days. We present their ...
An alternative explanation for the observed variation of solar p-modes with the solar cycle

Lydon, Thomas Joseph; Guenther, David B.; Sofia, S. (American Astronomical SocietyIOP Publishing, 1996-01-10)

By mimicking the effects of a magnetic field on the interior structure of a solar model, observed changes in p-mode frequencies over the course of the solar cycle are explained in terms of a change in the intensity and ...
Asteroseismic analysis of the pre-main-sequence stars in NGC 2264

Guenther, David B.; Kallinger, T.; Zwintz, K.; Weiss, W. W.; Kuschnig, R.; Casey, M. P.; Matthews, J. M.; Moffat, A. F. J.; Rucinski, S. M.; Sasselov, D.; Walker, G. A. H. (American Astronomical Society, 2009-10-20)

NGC 2264 is a young open cluster lying above the Galactic plane in which six variable stars have previously been identified as possible pre-main-sequence (PMS) pulsators. Their oscillation spectra are relatively sparse ...
MOST detects g- and p-modes in the B supergiant HD 163899 (B2 Ib/II )

Saio, H.; Kuschnig, R.; Gautschy, A.; Cameron, Chris; Walker, G. A. H.; Matthews, J. M.; Guenther, David B.; Moffat, A. F .J.; Rucinski, S. M.; Sasselov, D. (American Astronomical Society, 2006-10-20)

The Microvariability and Oscillations of Stars (MOST ) satellite observed the B supergiant HD 163899 (B2 Ib/ II ) for 37 days as a guide star and detected 48 frequencies [less than tilde] 2.8 cycles day [superscript minus ...
Detection of long-period variations in the subdwarf B star PG 0101+039 on the basis of photometry from the MOST satellite

Randall, S. K.; Matthews, J. M.; Fontaine, G.; Rowe, J.; Kuschnig, R.; Green, E. M.; Brassard, P.; Chayer, P.; Guenther, David B.; Moffat, A. F. J. (American Astronomical Society, 2005-11-01)

We report the detection of three discrete pulsation frequencies in the long-period variable subdwarf B star PG 0101+039 on the basis of ~400 hr of MOST wide-band photometry. The periodicities uncovered lie at 7235, 5227, ...
The run of superadiabaticity in stellar convection zones. II. Effect of photospheric convection on solar p-mode frequencies

Demarque, Pierre; Guenther, David B.; Kim, Yong-Cheol (American Astronomical Society, 1999-05-20)

Kim and Chan have completed a three-dimensional numerical simulation of the interaction between turbulent convection and radiation in and above the highly superadiabatic layer (SAL) in the Sun. They have shown that the ...
Testing the constancy of the gravitational constant using helioseismology

Guenther, David B.; Krauss, L. M.; Demarque, P. (American Astronomical Society, 1998-05-10)

We compare the p-mode oscillation spectra of solar models, constructed under the assumption that the universal gravitation constant G varied monotonically over the course of the solar lifetime, to the most recent solar ...
Asteroseismology of hybrid pulsators made possible: simultaneous MOST space photometry and ground-based spectroscopy of [gamma] PEG

Handler, G.; Matthews, J. M.; Eaton, J. A.; Daszynska-Daszkiewicz, J.; Kuschnig, R.; Lehmann, H.; Rodriguez, E.; Pamyatnykh, A. A.; Zdravkov, T.; Lenz, P.; Guenther, David B. (American Astronomical Society, 2009-06-10)

We have acquired simultaneous high-precision space photometry and radial velocities of the bright hybrid [beta] Cep/Slowly Pulsating B pulsator [gamma] Peg. Frequency analyses reveal the presence of six gravity (g) modes ...
WR 110: a single Wolf–Rayet star with corotating interaction regions in its wind?

Chene, A.-N.; Moffat, A. F .J.; Cameron, Chris; Fahed, R.; Gamen, R. C.; Lefevre, L.; Rowe, J. F.; St.-Louis, N.; Muntean, V.; De La Chevrotiere, A.; Guenther, David B. (American Astronomical Society, 2011-07-01)

A 30 day contiguous photometric run with the Microvariability and Oscillations of STars (MOST) satellite on the WN5-6b star WR 110 (HD 165688) reveals a fundamental periodicity of P = 4.08 ± 0.55 days along with a number ...
Space- and ground-based pulsation data of [eta] Bootis explained with stellar models including turbulence

Straka, Christian W.; Demarque, Pierre; Guenther, David B.; Li, Linghuai; Robinson, Frank J. (American Astronomical SocietyIOP PUblishing, 2006-01-10)

The space telescope MOST is now providing us with extremely accurate low-frequency p-mode oscillation data for the star [eta] Boo.We demonstrate in this paper that these data, when combined with ground-based measurements ...
The run of superadiabaticity in stellar convection zones. I. The Sun

Demarque, P.; Guenther, David B.; Kim, Y.-C (American Astronomical Society, 1997-01-10)

The effect of adjustments to the superadiabatic layer (SAL) in a model of the Sun on the p-mode oscillation frequencies has been studied. Numerical simulations of solar convection by Kim and coworkers have shown that the ...
Stellar model analysis of the oscillation spectrum of [eta] Bootis obtained from MOST

Guenther, David B.; Kallinger, T.; Reegen, P.; Weiss, W. W.; Matthews, J. M.; Kuschnig, R.; Marchenko, S.; Moffat, A. F. J.; Rucinski, S. M.; Sasselov, D.; Walker, G. A. H. (American Astronomical Society, 2005-12-10)

Eight consecutive low-frequency radial p-modes are identified in the G0 IV star [eta] Bootis based on 27 days of ultraprecise rapid photometry obtained by the MOST (Microvariability and Oscillations of Stars) satellite. ...
Toward a new kind of asteroseismic grid fitting

Gruberbauer, Michael; Guenther, David B.; Kallinger, T. (American Astronomical Society, 2012-04-20)

Recent developments in instrumentation (e.g., in particular the Kepler and CoRoT satellites) provide a new opportunity to improve the models of stellar pulsations. Surface layers, rotation, and magnetic fields imprint ...
Low-Q[superscript 2] measurements of the proton form factor ratio [mu][subscript p]G[subscript E]/G[subscript M]

Ron, G.; Zhan, X.; Glister, J.; Lee, B.; Allada, K.; Armstrong, W.; Arrington, J.; Beck, A.; Benmokhtar, F.; Berman, B. L.; McCullough, E.; Sarty, Adam James, 1965- (American Physical Society, 2011-11-21)

We present an updated extraction of the proton electromagnetic form factor ratio, [mu][subscript p]G[subscript E]/G[subscript M], at low Q[superscript 2]. The form factors are sensitive to the spatial distribution of the ...
Reorientation-effect measurement of the <2[subscript 1][superscript +] [parallel to] E[hat] 2 [parallel to] 2[subscript 1][superscript +]> matrix element in [superscript 10]Be

Orce, J. N.; Drake, T. E.; Djongolov, M. K.; Navratil, P.; Triambak, S.; Ball, G. C.; Al Falou, H.; Churchman, R.; Cross, D. S.; Finlay, P. (American Physical Society, 2012-10)

The highly-efficient and segmented TIGRESS [gamma]-ray spectrometer at TRIUMF has been used to perform a reorientation-effect Coulomb-excitation study of the 2[subscript1][superscript +] state at 3.368 MeV in [superscript ...
Search for a new gauge boson in electron-nucleus fixed-target scattering by the APEX experiment

Abrahamyan, S.; Ahmed, Z.; Allada, K.; Anez, D.; Averett, T.; Barbieri, A.; Bartlett, K.; Beacham, J.; Bono, J; Boyce, J.R. (American Physical Society, 2011-11)

We present a search at the Jefferson Laboratory for new forces mediated by sub-GeV vector bosons with weak coupling [alpha] 'to electrons. Such a particle [Alpha] can be produced in electron-nucleus fixed-target scattering ...
Do halo nuclei follow Rutherford Elastic Scattering at energies below the barrier? The case of [superscript 11]Li

Cubero, M.; Fernandez-Garcia, J. P.; Rodriguez-Gallardo, M.; Acosta, L.; Alcorta, M.; Alvarez, M. A. G.; Borge, M. J. G.; Buchmann, L.; Diget, C. A.; Al Falou, H.; Kanungo, Rituparna (American Physical Society, 2012-12)

The first measurement of the elastic scattering of the halo nucleus [superscript 11]Li and its core [superscript 9]Li on [superscript 208]Pb at energies near the Coulomb barrier is presented. The [superscript 11]Li + ...