Browsing Articles by Author "Sasselov, D."

Now showing items 1-11 of 11

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 ...
[delta] Ceti is not monoperiodic: seismic modeling of a [beta] Cephei star from MOST space-based photometry

Guenther, David B.; Aerts, C.; Marchenko, S. V.; Matthews, J. M.; Kuschnig, R.; Moffat, A. F. J.; Rucinski, S. M.; Sasselov, D.; Walker, G. A. H.; Weiss, W. W. (American Astronomical Society, 2006-05)

The [beta] Cephei star [delta] Ceti was considered one of the few monoperiodic variables in its class. Despite (or perhaps because of) its apparently simple oscillation spectrum, it has been challenging and controversial ...
Discovery of the new slowly pulsating B star HD 163830 (B5 II/III) from MOST space-based photometry

Guenther, David B.; Aerts, C.; De Cat, P.; Kuschnig, R.; Matthews, J. M.; Moffat, A. F. J.; Rucinski, S. M.; Sasselov, D.; Walker, G. A. H.; Weiss, W. W. (American Astronomical SocietyIOP Publishing, 2006-05-10)

We report the discovery of a new slowly pulsating B star, with the largest number of detected frequencies to date by more than a factor of 3, based on 37 days of MOST (Microvariability and Oscillations of STars) satellite ...
The mass of the planet-hosting giant star [beta] Geminorum determined from its p-mode oscillation spectrum

Guenther, David B.; Hatzes, A. P.; Zechmeister, M.; Matthews, J.; Kuschnig, R.; Walker, G. A. H.; Dollinger, M.; Moffat, A. F. J.; Rucinski, S. M.; Sasselov, D. (EDP Sciences, 2012-07)

Aims. Our aim is to use precise radial velocity measurements and photometric data to derive the frequency spacing of the p-mode oscillation spectrum of the planet-hosting star [beta] Gem. This spacing along with the ...
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 ...
MOST detects SPBe pulsations in HD 127756 and HD 217543: asteroseismic rotation rates independent of v sin i[superscript 1]

Guenther, David B.; Cameron, Chris; Saio, H.; Kuschnig, R.; Walker, G. A. H.; Matthews, J. M.; Moffat, A. F. J.; Rucinski, S. M.; Sasselov, D.; Weiss, W. W. (American Astronomical Society, 2008-09)

The MOST (Microvariability and Oscillations of Stars ) satellite has discovered SPBe (slowly pulsating Be) oscillations in the stars HD 127756 (B1/B2 Vne) and HD 217543 (B3 Vpe). For HD 127756, 30 significant frequencies ...
MOST observations of the roAp stars HD 9289, HD 99563, and HD 134214

Guenther, David B.; Gruberbauer, Michael; Huber, D.; Kuschnig, R.; Weiss, W. W.; Matthews, J. M.; Moffat, A. F. J.; Rowe, J. F.; Rucinski, S. M.; Sasselov, D. (EDP Sciences, 2011-06)

We report on the analysis of high-precision space-based photometry of the roAp (rapidly oscillating Ap) stars HD 9289, HD 99563, and HD 134214. All three stars were observed by the MOST satellite for more than 25 days, ...
Nonradial p-modes in the G9.5 giant [epsilon] Ophiuchi? Pulsation model fits to MOST photometry

Kallinger, T.; Guenther, David B.; Matthews, J. M.; Weiss, W. W.; Huber, D.; Kuschnig, R.; Moffat, A. F. J.; Rucinski, S. M.; Sasselov, D. (European Southern ObservatoryEDP Sciences, 2008)

The G9.5 giant [epsilon] Oph shows evidence of radial p-mode pulsations in both radial velocity and luminosity. We re-examine the observed frequencies in the photometry and radial velocities and find a best model fit to ...
Observations of Cepheids with the MOST satellite: contrast between pulsation modes

Evans, N. R.; Szabo, R.; Derekas, A.; Szabados, L.; Cameron, C.; Matthews, J. M.; Sasselov, D.; Kuschnig, R.; Rowe, J. F.; Guenther, David B. (Oxford University Press, 2015-02)

The quantity and quality of satellite photometric data strings is revealing details in Cepheid variation at very low levels. Specifically, we observed a Cepheid pulsating in the fundamental mode and one pulsating in 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. ...
V473 Lyr, a modulated, period-doubled Cepheid, and U TrA, a double-mode Cepheid, observed by MOST

Molnar, L.; Derekas, A.; Szabo, R.; Matthews, J. M.; Cameron, C.; Moffat, A. F. J.; Richardson, N. D.; Csak, B.; Dozsa, A.; Reed, P.; Szabados, L.; Heathcote, B.; Bohlsen, T.; Cacella, P.; Luckas, P.; Sodor, A.; Skarka, M.; Szabo, Gy. M.; Plachy, E.; Kovacs, J.; Evans, N. R.; Kolenberg, K.; Collins, K. A.; Pepper, J.; Stassun, K. G.; Rodriguez, J. E.; Siverd, R. J.; Henden, A.; Mankiewicz, L.; Zarnecki, A. F.; Cwiek, A.; Sokolowski, M.; Pal, A.; Guenther, David B.; Kuschnig, R.; Rowe, J.; Rucinski, S. M.; Sasselov, D.; Weiss, W. W. (Oxford University Press, 2017-05)

Space-based photometric measurements first revealed low-amplitude irregularities in the pulsations of Cepheid stars, but their origins and how commonly they occur remain uncertain. To investigate this phenomenon, we present ...