H. Pablo, S. D. Kawaler, Elizabeth M. Green,
We report on Kepler photometry of the hot subdwarf B (sdB) star B4 in the open cluster NGC 6791. We confirm that B4 is a reflection effect binary with an sdB component and a low-mass main-sequence companion with a circular 0.3985 day orbit. The sdB star is a g-mode pulsator (a V1093 Her star) with periods ranging from 2384 s to 7643 s. Several of the pulsation modes show symmetric splitting by 0.62 μHz. Attributing this to rotational splitting, we conclude that the sdB component has a rotation period ...
Tópico(s): Astro and Planetary Science
2011 - IOP Publishing | The Astrophysical Journal Letters
L. R. Bedin, M. Salaris, Jay Anderson, M. Scalco, D. Nardiello, Enrico Vesperini, Harvey B. Richer, Adam J. Burgasser, M. Griggio, Roman Gerasimov, Dániel Apai, Andrea Bellini, Mattia Libralato, P. Bergeron, R. Michael Rich, A. Grazian,
... cooling sequence (WD CS) in the globular cluster NGC 6752. The investigation is the main goal of ...
Tópico(s): Astronomy and Astrophysical Research
2022 - Oxford University Press | Monthly Notices of the Royal Astronomical Society
... HI line observations of the nearby spiral galaxy NGC 3521 observed with the VLA as part of ... It is concluded that the anomalous HI in NGC 3521 constitutes a slow-rotating halo gas component, ...
Tópico(s): Stellar, planetary, and galactic studies
2013 - Oxford University Press | Monthly Notices of the Royal Astronomical Society