641 research outputs found
Variable stars with the Kepler space telescope
The Kepler space telescope has revolutionised our knowledge about exoplanets
and stars and is continuing to do so in the K2 mission. The exquisite
photometric precision, together with the long, uninterrupted observations
opened up a new way to investigate the structure and evolution of stars.
Asteroseismology, the study of stellar oscillations, allowed us to investigate
solar-like stars and to peer into the insides of red giants and massive stars.
But many discoveries have been made about classical variable stars too, ranging
from pulsators like Cepheids and RR Lyraes to eclipsing binary stars and
cataclysmic variables, and even supernovae. In this review, which is far from
an exhaustive summary of all results obtained with Kepler, we collected some of
the most interesting discoveries, and ponder on the role for amateur observers
in this golden era of stellar astrophysics.Comment: 12 pages, 6 figures, published in the Journal of the AAVSO:
https://www.aavso.org/apps/jaavso/article/3235/, v2: fixed a bad a reference.
arXiv admin note: text overlap with arXiv:1108.3083 by other author
Shockwave Behaviour in RR Lyrae Stars
Here we present the detailed analysis of some modulated Kepler and K2 RR
Lyrae stars that show peculiar bump progression in respect to the pulsation
phase.Comment: 3 pages, 3 figures, to be published in the proceedings of "The RR
Lyrae 2017 Conference", Niepolomice, Poland, 17-21 September 201
A modulated RRd star observed by K2
We report the analysis of the double-mode RR Lyrae star EPIC 205209951, the
first modulated RRd star observed from space. The amplitude and phase
modulation are present in both modes.Comment: 2 pages, 3 figures, proceedings of the Joint
TASC2-KASC9-SPACEINN-HELAS8 Conference "Seismology of the Sun and the Distant
Stars 2016", to be published in EPJ Wo
Constraining RRc candidates using SDSS colours
The light variations of first-overtone RR Lyrae stars and contact eclipsing
binaries can be difficult to distinguish. The Catalina Periodic Variable Star
catalog contains several misclassified objects, despite the classification
efforts by Drake et al. (2014). They used metallicity and surface gravity
derived from spectroscopic data (from the SDSS database) to rule out binaries.
Our aim is to further constrain the catalog using SDSS colours to estimate
physical parameters for stars that did not have spectroscopic data.Comment: 2 pages, 1 figure, proceedings of the RRL2015 - High-Precision
Studies of RR Lyrae Stars conference, to appear in the Communications from
the Konkoly Observator
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