Browsing Articles by Subject "Peculiar stars"

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The chemical evolution of globular clusters – II. Metals and fluorine

Sanchez-Blazquez, P.; Marcolini, A.; Gibson, Brad K.; Karakas, A. I.; Pilkington, K.; Calura, F. (Oxford University Press, 2012-01)

In the first paper of this series, we proposed a new framework in which to model the chemical evolution of globular clusters. This model is predicated upon the assumption that clusters form within an interstellar medium ...
Kepler observations of rapidly oscillating Ap, [delta] Scuti and [gamma] Doradus pulsations in Ap stars

Balona, L. A.; Cunha, M. S.; Kurtz, D. W.; Brandao, I. M.; Gruberbauer, Michael; Saio, H.; Ostensen, R.; Elkin, V. G.; Borucki, W. J.; Christensen-Dalsgaard, J. (Wiley-Blackwell, 2011-01-01)

Observations of the A5p star KIC 8677585 obtained during the Kepler 10-d commissioning run with 1-min time resolution show that it is a rapidly oscillating Ap (roAp) star with several frequencies with periods near 10 min. ...
MOST observations of [sigma] Ori E: challenging the centrifugal breakout narrative

Guenther, David B.; Townsend, R. H. D.; Rivinius, Th.; Rowe, J. F.; Moffat, A. F. J.; Matthews, J. M.; Bohlender, D.; Neiner, C.; Telting, J. H.; Kallinger, T. (American Astronomical SocietyIOP Science, 2013-05-20)

We present results from three weeks’ photometric monitoring of the magnetic helium-strong star [sigma] Ori E using the Microvariability and Oscillations of Stars microsatellite. The star’s light curve is dominated by ...
Pulsation models for the roAp star HD 134214

Saio, H.; Gruberbauer, Michael; Weiss, W. W.; Matthews, J. M.; Ryabchikova, T. (Oxford University Press, 2012-02)

Precise time series photometry with the MOST satellite has led to identification of 10 pulsation frequencies in the rapidly oscillating Ap (roAp) star HD134214. We have fitted the observed frequencies with theoretical ...
Rotation and oblique pulsation in Kepler observations of the roAp star KIC 10483436

Gruberbauer, Michael; Balona, L. A.; Cunha, M. S.; Kurtz, D. W.; Saio, H.; White, T. R.; Christensen-Dalsgaard, J.; Kjeldsen, H.; Christiansen, J. L.; Hall, J. R. (Oxford University Press, 2011)

Photometry of KIC 10483436 was obtained continuously with 1-min exposures over a 27-d period from the Kepler satellite. The light curve shows rotational variations from surface spots with a period of 4.303 [plus or minus] ...
Weak magnetic fields in Ap/Bp stars: evidence for a dipole field lower limit and a tentative interpretation of the magnetic dichotomy

Auriere, M.; Wade, G. A.; Silvester, J.; Lignieres, F.; Bagnulo, S.; Bale, K.; Dintrans, B.; Donati, J. F.; Folsom, C. P.; Gruberbauer, Michael; Toque, N. (EDP Sciences, 2007-12)

Aims. We investigated a sample of 28 well-known spectroscopically-identified magnetic Ap/Bp stars, with weak, poorly-determined or previously undetected magnetic fields. The aim of this study is to explore the weak part ...