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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
CCD SDSS gr Photometry of Poorly Studied Star Clusters in the Large Magellanic Cloud
International Scholarly Research Notices, Volume 2014, Issue 1, 2014., 2014 We present for the first time CCD SDSS gr photometry, obtained at the Gemini South telescope with the GMOS attached, of stars in the field of the poorly studied star clusters NGC1768, HS 85, SL 676, NGC2107, NGC2190, and SL 866, which are distributed in the main body of the Large Magellanic Cloud.
Andrés E. Piatti, M. Marconi, L. Pulone
wiley +1 more source
Catalogue of variable stars in Milky Way globular clusters
EPJ Web of Conferences, 2017 Globular cluster variable stars have been studied for more than a century. In the early investigations, more than 90% of the known variables were of the RR Lyrae type.
Clement Christine
doaj +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
Implications and Applications of Kinematic Galaxy Scaling Relations
International Scholarly Research Notices, Volume 2012, Issue 1, 2012., 2012 Galaxy scaling relations, which describe a connection between ostensibly unrelated physical characteristics, testify to an underlying order in galaxy formation that requires understanding. I review the development of a scaling relation that (1) unites the well‐known fundamental plane (FP) relation of giant elliptical galaxies and Tully‐Fisher (TF ...
Dennis Zaritsky +2 more
wiley +1 more source
Period distributions of irregularly variable RR Lyrae stars [PDF]
Publications of the Astronomical Society of the Pacific, 1981 The occurrence of irregularly variable RR Lyrae stars in four globular clusters and the Draco dwarf spheroidal galaxy are examined in order to determine their period distributions. Two of the clusters are of Oosterhoff type I, M3 and M5, and two are of Oosterhoff type II, M15 and omega-Cen.
openaire +1 more source
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
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
ASAS-SN Discovery of 4880 Bright RR Lyrae Variable Stars [PDF]
Research Notes of the AAS, 2018 We present a catalog of 4880 newly identified RR Lyrae variable stars (4433 RRab, 446 RRc and 1 RRd) found during the search for supernovae by the All-Sky Automated Survey for Supernovae (ASAS-SN). The light curves, classified using the "Upsilon" random forest classifier and visually verified, are available through the ASAS-SN variable star database ...
T. Jayasinghe +9 more
openaire +2 more sources
Three dimensional maps of the Magellanic Clouds using RR Lyrae Stars and Cepheids II. The Small Magellanic Cloud [PDF]
, 2012 We use data on variable stars from the Optical Gravitational Lensing Experiment (OGLE III) survey to determine the three-dimensional structure of the Small Magellanic Cloud (SMC).
Duffau, Sonia +2 more
core +1 more source