Browsing Articles by Subject "Double stars"

Now showing items 1-11 of 11

[alpha] Centauri AB

Guenther, David B.; Demarque, P. (American Astronomical Society, 2000-03)

Detailed models of [alpha] Centauri A and B based on the Hipparcos, Yale, and Soderhjelm parallaxes are compared. The consequences of the uncertainty in mass, luminosity, surface temperature, and composition on the structure ...
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 ...
A coordinated X-ray and optical campaign of the nearest massive eclipsing binary, [delta] Orionis Aa. III. Analysis of optical photometric (MOST) and spectroscopic (ground based) variations

Pablo, Herbert; Richardson, Noel D.; Moffat, Anthony F. J.; Corcoran, Michael; Shenar, Tomer; Benvenuto, Omar; Fuller, Jim; Naze, Yael; Hoffman, Jennifer L.; Miroshnichenko, Anatoly; Guenther, David B. (American Astronomical Society, 2015-08-20)

We report on both high-precision photometry from the Microvariability and Oscillations of Stars (MOST) space telescope and ground-based spectroscopy of the triple system [delta] Ori A, consisting of a binary O9.5II+early-B ...
The [gamma]-ray binary LS 5039: mass and orbit constraints from MOST observations

Sarty, Gordon E.; Szalai, Tamas; Kiss, Laszlo L.; Matthews, Jaymie M.; Wu, Kinwah; Kuschnig, Rainer; Guenther, David B.; Moffat, Anthony F. J.; Rucinski, Slavek M.; Sasselov, Dimitar (Wiley-Blackwell, 2011-02)

The results of a coordinated space-based photometric and ground-based spectroscopic observing campaign on the enigmatic γ-ray binary LS 5039 are reported. 16 d of observations from the MOST satellite have been combined ...
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 ...
The pulsation properties of Procyon A

Guenther, David B.; Chaboyer, Brian; Demarque, P. (American Astronomical Society, 1999-11-01)

A grid of stellar evolution models for Procyon A has been calculated. These models include the best physics available to us (including the latest opacities and equation of state) and are based on the revised astrometric ...
A search for p-modes and other variability in the binary system 85 Pegasi using MOST photometry

Guenther, David B.; Gruberbauer, Michael; Huber, D.; Matthews, J. M.; Croll, B.; Obbrugger, M.; Weiss, W. W.; Rowe, J. F.; Kallinger, T.; Kuschnig, R. (EDP Sciences, 2009-10)

Context. Asteroseismology has great potential for the study of metal-poor stars due to its sensitivity to determine stellar ages. Solid detections of oscillation frequencies in stars with well constrained fundamental ...
Spectroscopy, MOST photometry, and interferometry of MWC 314: is it an LBV or an interacting binary?

Richardson, Noel D.; Moffat, Anthony F. J.; Maltais–Tariant, Raphael; Pablo, Herbert; Gies, Douglas R.; Saio, Hideyuki; St-Louis, Nicole; Schaefer, Gail; Miroshnichenko, Anatoly S.; Farrington, Chris; Guenther, David B. (Oxford University Press, 2016)

MWC 314 is a bright candidate luminous blue variable (LBV) that resides in a fairly close binary system, with an orbital period of 60.753 [plus or minus] 0.003 d. We observed MWC 314 with a combination of optical spectroscopy, ...
Stellar modelling of Spica, a high-mass spectroscopic binary with a [beta] Cep variable primary component

Tkachenko, A.; Matthews, J. M.; Aerts, C.; Pavlovski, K.; Papics, P. I.; Zwintz, K.; Cameron, C.; Walker, G. A. H.; Kuschnig, R.; Degroote, P.; Guenther, David B. (Oxford University Press, 2016-05-11)

Binary stars provide a valuable test of stellar structure and evolution, because the masses of the individual stellar components can be derived with high accuracy and in a model-independent way. In this work, we study ...
Using MOST to reveal the secrets of the mischievous Wolf–Rayet binary CV Ser

Guenther, David B.; David-Uraz, Alexandre; Moffat, Anthony F. J.; Chene, Andre-Nicolas; Rowe, Jason F.; Lange, Nicholas; Kuschnig, Rainer; Matthews, Jaymie M.; Rucinski, Slavek M.; Sasselov, Dimitar (Royal Astronomical Society, 2012)

The Wolf–Rayet (WR) binary CV Serpentis (= WR113, WC8d + O8-9IV) has been a source of mystery since it was shown that its atmospheric eclipses change with time over decades, in addition to its sporadic dust production. The ...
xi Tauri: a unique laboratory to study the dynamic interaction in a compact hierarchical quadruple system

Nemravova, J. A.; Harmanec, P.; Broz, M.; Vokrouhlicky, D.; Mourard, D.; Hummel, C. A.; Cameron, C.; Matthews, J. M.; Bolton, C. T.; Borzic, H.; Guenther, David B. (EDP Sciences, 2016-10)

Context. Compact hierarchical systems are important because the effects caused by the dynamical interaction among its members occur on a human timescale. These interactions play a role in the formation of close binaries ...