Results 41 to 50 of about 363 (172)
Three Years of Experience with the STELLA Robotic Observatory
Advances in Astronomy, Volume 2010, Issue 1, 2010., 2010 Since May 2006, the two STELLA robotic telescopes at the Izaña observatory in Tenerife, Spain, delivered an almost uninterrupted stream of scientific data. To achieve such a high level of autonomous operation, the replacement of all troubleshooting skills of a regular observer in software was required. Care must be taken on error handling issues and on
Thomas Granzer +3 more
wiley +1 more source
Study of the Blazhko Type RRc stars in the Stripe 82 Region Using SDSS and ZTF
The Astronomical Journal, 2023 RR Lyrae stars (RRLs) are pulsating stars, many of which also show a long-term variation called the Blazhko effect which is a modulation of amplitude and phase of the lightcurve.
Vaidehi Varma +2 more
doaj +1 more source
EPJ Web of Conferences, 2017 We have initiated a large survey with K2 to observe thousands of RR Lyrae stars along the Ecliptic. The high photometric precision and the 80-90-day continuous coverage will allow us to investigate the light variation of these galactic structure tracer ...
Szabó Róbert +5 more
doaj +1 more source
The Changing Lightcurve of the Double-mode RR Lyrae Variable Star V338 Boo [PDF]
The Astrophysical Journal Letters, 2021 Abstract We present an analysis of the lightcurve extracted from Transiting Exoplanet Survey Satellite (TESS) Full Frame Images (FFIs) of the double-mode RR Lyrae V338 Boo. We find that the fundamental mode pulsation is changing in amplitude across the 54 days of observations.
Kenneth Carrell +5 more
openaire +2 more sources
THE CHEMICAL COMPOSITIONS OF RR LYRAE TYPE C VARIABLE STARS [PDF]
The Astrophysical Journal, 2014 We present a detailed chemical abundance study of eight RR Lyrae variable stars of subclass c (RRc). The target RRc stars chosen for study exhibit "Blazhko-effect" period and amplitude modulations to their pulsational cycles. Data for this study were gathered with the echelle spectrograph of the 100 inch du Pont telescope at Las Campanas Observatory ...
Govea, Jose +3 more
openaire +2 more sources
Pulsating stars in ω Centauri. Near-IR properties and period-luminosity relations
EPJ Web of Conferences, 2017 ω Centauri (NGC 5139) contains many variable stars of different types, including the pulsating type II Cepheids, RR Lyrae and SX Phoenicis stars. We carried out a deep, wide-field, near-infrared (IR) variability survey of ω Cen, using the VISTA telescope.
Navarrete Camila +6 more
doaj +1 more source
First direct detection of an RR Lyrae star conclusively associated with an intermediate-age cluster
Astronomy & AstrophysicsContext. RR Lyrae stars have long been considered unequivocal tracers of old (>10 Gyr) and metal-poor ([Fe/H]
Mateu Cecilia +2 more
doaj +1 more source
Progress report on the K2 RR Lyrae survey
EPJ Web of Conferences, 2017 We have initiated a large survey with K2, to observe thousands of RR Lyrae stars along the ecliptic. The high photometric precision and the 70-90-day continuous coverage will allow us to investigate the light variation of these galactic structure tracer ...
Szabó Róbert
doaj +1 more source
RR Lyrae binary systems in the Galactic bulge
EPJ Web of Conferences, 2017 The possibility of a direct mass measurement of RR Lyrae variable stars in binary systems has remained elusive for many years, due to the apparent paucity of such systems.
Hajdu Gergely, Catelan Márcio
doaj +1 more source
Variability in NGC 3201 Giant Stars
The Astronomical Journal, 2023 We present the analysis of 510 light curves in V and I bands of 255 giant stars in the globular cluster NGC 3201. Our aim is to expand the sample of new types of variables reported in a previous study. These variables show a short period ( P _V < 0.6 day)
C. C. Cortés +4 more
doaj +1 more source