Browsing Articles by Subject "Astronomical photometry"

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MOST detects transits of HD 97658b, a warm, likely volatile-rich super-Earth

Dragomir, Diana; Matthews, Jaymie M.; Eastman, Jason D.; Cameron, Chris; Howard, Andrew W.; Guenther, David B.; Kuschnig, Rainer; Moffat, Anthony F. J.; Rowe, Jason F.; Rucinski, Slavek M. (IOP Publishing Limited, 2013-07-20)

Through photometric monitoring of the extended transit window of HD 97658b with the MOST space telescope, we have found that this exoplanet transits with an ephemeris consistent with that predicted from radial velocity ...
MOST light-curve analysis of the [gamma] Doradus pulsator HR8799, showing resonances and amplitude variations

Sodor, A.; Chene, A. -N.; De Cat, P.; Bognar, Zs.; Wright, D. J.; Marois, C.; Walker, G. A. H.; Matthews, J. M.; Kallinger, T.; Rowe, J. F.; Guenther, David B. (EDP Sciences, 2014-08)

Context. The central star of the HR 8799 system is a γ Doradus-type pulsator. The system harbours four planetary-mass companions detected by direct imaging, and is a good solar system analogue. The masses of the ...
MOST observations of the Herbig Ae [delta]-Scuti star HD 34282

Guenther, David B.; Casey, M. P.; Zwintz, K.; Weiss, W. W.; Amado, P. J.; Diaz-Fraile, D.; Rodriguez, E.; Kuschnig, R.; Matthews, J. M.; Moffat, A. F. J. (Royal Astronomical SocietyOxford University Press, 2013-01)

Microvariability and Oscillations of STars observations and model analysis of the Herbig Ae star HD 34282 (V1366 Ori) reveal [delta] Scuti pulsations. 22 frequencies are observed, 10 of which confirm those previously ...
MOST photometry and DDO spectroscopy of the eclipsing (white dwarf + red dwarf) binary V471 Tau

Guenther, David B.; Kaminski, Krzysztof Z.; Rucinski, Slavek M.; Matthews, Jaymie M.; Kuschnig, Rainer; Rowe, Jason F.; Moffat, Anthony F. J.; Sasselov, Dimitar; Walker, Gordon A. H.; Weiss, Werner W. (American Astronomical Society, 2007-09)

The Hyades K2 V + WD system 471 Tau is a prototype post-common envelope system and a likely cataclysmic binary progenitor. We present 10 days of nearly continuous optical photometry by the MOST (Microvariability and ...
MOST photometry and modeling of the rapidly oscillating (roAp) star [gamma] Equulei

Guenther, David B.; Gruberbauer, Michael; Saio, H.; Huber, D.; Kallinger, T.; Weiss, W. W.; Kuschnig, R.; Matthews, J. M.; Moffat, A. F. J.; Rucinski, S. (EDP Sciences, 2008)

Aims. Despite photometry and spectroscopy of its oscillations obtained over the past 25 years, the pulsation frequency spectrum of the rapidly oscillating Ap (roAp) star [gamma] Equ has remained poorly understood. Better ...
MOST photometry of the roAp star 10 Aquilae

Guenther, David B.; Huber, D.; Saio, H.; Gruberbauer, Michael; Weiss, W. W.; Rowe, J. F.; Hareter, M.; Kallinger, T.; Reegen, P.; Matthews, J. M. (EDP Sciences, 2008-05)

Context. We present 31.2 days of nearly continuous MOST photometry of the rapidly oscillating Ap star 10 Aql. Aims. The goal was to provide an unambiguous frequency identification for this little studied star, as well as ...
MOST photometry of the RRd Lyrae variable AQ Leo: two radial modes, 32 combination frequencies and beyond

Guenther, David B.; Gruberbauer, Michael; Kolenberg, Katrien; Rowe, Jason F.; Huber, Daniel; Matthews, Jaymie M.; Reegen, Piet; Kuschnig, Rainer; Cameron, Chris; Kallinger, T. (Oxford University Press, 2007-08)

Highly precise and nearly uninterrupted optical photometry of the RR Lyrae star AQ Leo was obtained with the MOST (Microvariability and Oscillations of Stars) satellite over 34.4 d in 2005 February–March. AQ Leo was the ...
The nature of p-modes and granulation in HD 49933 observed by CoRoT

Guenther, David B.; Gruberbauer, Michael; Kallinger, T.; Fossati, L.; Weiss, W. W. (EDP Sciences, 2010-02)

Context. Recent observations of HD 49933 by the space-photometric mission CoRoT provide photometric evidence of solar type oscillations in a star other than our Sun. The first published reduction, analysis, and interpretation ...
The nature of p-modes and granulation in Procyon: new MOST photometry and new Yale convection models

Guenther, David B.; Kallinger, T.; Gruberbauer, Michael; Huber, D.; Weiss, W. W.; Kuschnig, R.; Demarque, P.; Robinson, F.; Matthews, J. M.; Moffat, A. F. J. (American Astronomical Society, 2008-11)

We present new photometry of Procyon, obtained by MOST during a 38 day run in 2007, and frequency analyses of those data. The long time coverage and low point-to-point scatter of the light curve yield an average noise ...
A new pulsational radius for Delta Cephei

Turner, David Gerald, 1945- (American Astronomical Society, 1988-11)

The Baade-Wesselink method has been reapplied to existing photometric and radial-velocity measures for the classical Cepheid [delta] Cephei, but a different approach to the analysis was adopted in which spectrophotometric ...
The Next Generation Virgo Cluster Survey. XV. The photometric estimation for background sources

Raichoor, A.; Mei, S.; Erben, T.; Hildebrandt, H.; Huertas-Company, M.; Ilbert, O.; Licitra, R.; Ball, N. M.; Boissier, S.; Boselli, A.; Sawicki, Marcin, 1969- (American Astronomical SocietyIOP Publishing, 2014-12-20)

The Next Generation Virgo Cluster Survey (NGVS) is an optical imaging survey covering 104 deg[superscript 2] centered on the Virgo cluster. Currently, the complete survey area has been observed in the u[superscript ∗] giz ...
Non-local thermodynamic equilibrium 1.5D modeling of red giant stars

Young, Mitchell E.; Short, C. Ian (Christopher Ian), 1965- (IOP Publishing, 2014-05-20)

Spectra for two-dimensional (2D) stars in the 1.5D approximation are created from synthetic spectra of one-dimensional (1D) non-local thermodynamic equilibrium (NLTE) spherical model atmospheres produced by the PHOENIX ...
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 ...
On the existence of young embedded clusters at high Galactic latitude

Turner, David Gerald, 1945-; Carraro, G.; Panko, E. A. (Oxford University Press, 2017-05-24)

Careful analyses of photometric and star count data available for the nine putative young clusters identified by Camargo et al. at high Galactic latitudes reveal that none of the groups contain early-type stars, and most ...
Oscillating red giants in the CoRoT exofield: asteroseismic mass and radius determination

Cameron, C.; Gruberbauer, Michael; Kallinger, T.; Weiss, W. W.; Barban, C.; Baudin, F.; Carrier, F.; De Ridder, J.; Goupil, M.-J.; Hatzes, A. (EDP Sciences, 2010-01)

Context. Observations and analysis of solar-type oscillations in red-giant stars is an emerging aspect of asteroseismic analysis with a number of open questions yet to be explored. Although stochastic oscillations have ...
Photoelectric observations of southern Cepheids in 2001

Berdnikov, Leonid N.; Turner, David Gerald, 1945- (American Astronomical Society, 2001-11)

A total of 2097 photometric observations in the BVI[subscript c] system are presented for 117 Cepheids located in the southern hemisphere. The main purpose of the photometry is to provide new epochs of maximum brightness ...
A photometric investigation of cluster membership for the Cepheid BB Sagittarii

Turner, David Gerald, 1945-; Pedreros, Mario (American Astronomical Society, 1985-07)

Photoelectric photometry (UBV and some VRI) is presented for the close pair of open clusters Cr 394 and NGC 6716 and for the 6[d over dot]64 classical Cepheid BB Sgr. Based upon the photometric data and star counts, the ...
Photometric variability in FU Ori and Z CMa as observed by MOST

Siwak, Michal; Rucinski, Slavek M.; Matthews, Jaymie M.; Kuschnig, Rainer; Guenther, David B.; Moffat, Anthony F. J.; Rowe, Jason F.; Sasselov, Dimitar; Weiss, Werner W. (Oxford University Press, 2013-06)

Photometric observations obtained by the MOST satellite were used to characterize optical small-scale variability of the young stars FU Ori and Z CMa. Wavelet analysis for FU Ori reveals the possible existence ...
The quasar PG 0844+349 in an X-ray weak state

Gallo, Luigi C.; Grupe, D.; Schartel, N.; Komossa, S.; Miniutti, G.; Fabian, A. C.; Santos-Lleo, M. (Oxford University Press, 2011-03)

In 2009 March the well-studied quasar, PG 0844+349, was discovered with Swift to be in an X-ray weak state. A follow-up XMM–Newton observation several weeks later generated a good-quality spectrum of the source, showing ...

Browsing Articles by Subject "Astronomical photometry"

Browsing Articles by Subject "Astronomical photometry"

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