Results 31 to 40 of about 23,538 (190)

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, Michael Weber, Klaus G. Strassmeier, Joshua S. Bloom   +3 more
wiley   +1 more source

Variable Stars in the Unusual, Metal-Rich Globular Cluster NGC 6388 [PDF]

, 2001
We have undertaken a search for variable stars in the metal-rich globular cluster NGC 6388 using time-series BV photometry. Twenty-eight new variables were found in this survey, increasing the total number of variables found near NGC 6388 to ~57.
Alcaino G., Allen V. Sweigart, Barton J. Pritzl, Bingham E. A., Brocato E., Caloi V., Caputo F., Castellani V., Catelan M., Catelan M., Fusi Pecci F., Horace A. Smith, Jurcsik J., Jurcsik J., Jurcsik J., Kaluzny J., Kovacs G., Lloyd Evans T., Márcio Catelan, Petersen J. O., Reimers D.   +20 more
core   +3 more sources

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

The ancient stellar population of M 32 : RR Lyrae variable stars confirmed [PDF]

, 2012
Using archival multi-epoch ACS/WFC images in the F606W and F814W filters of a resolved stellar field in Local Group dwarf elliptical galaxy M 32 we have made an accurate colour-magnitude diagram and a careful search for RR Lyr variable stars.
Giuliana Fiorentino, R. C. Ramos, E. Tolstoy, G. Clementini, A. Saha   +4 more
semanticscholar   +1 more source

Concerning the Distance to the Center of the Milky Way and its Structure [PDF]

, 2010
The distance to the Galactic center inferred from OGLE RR Lyrae variables observed in the direction of the bulge is Ro=8.1+-0.6 kpc. An accurate determination of Ro is hindered by countless effects that include an ambiguous extinction law, a bias for ...
Majaess, Daniel J.
core   +2 more sources

FREQUENCY ANALYSIS OF PHOTOGRAPHIC OBSERVATIONS OF PULSATING STARS

Odessa Astronomical Publications, 2017
The Fourier analysis are performed for photoelectric and photographic B-observations (Goranskij and Shugarov, 1979) of RR Lyrae star RW Ari. Besides the main frequency f0 and four its first harmonics two more frequencies are found: f1 =f0 /3 and f2 =0 ...
V. P. Bezdenezhnyi
doaj   +1 more source

Precise Empirical Determination of Metallicity Dependence of Near-infrared Period–Luminosity Relations for RR Lyrae Variables

The Astrophysical Journal Letters, 2023
RR Lyrae variables are excellent Population II distance indicators thanks to their well-defined period–luminosity relations (PLRs) at infrared wavelengths.
Anupam Bhardwaj, Marcella Marconi, Marina Rejkuba, Richard de Grijs, Harinder P. Singh, Vittorio F. Braga, Shashi Kanbur, Chow-Choong Ngeow, Vincenzo Ripepi, Giuseppe Bono, Giulia De Somma, Massimo Dall’Ora   +11 more
doaj   +1 more source

Revisiting CoRoT RR Lyrae stars: detection of period doubling and temporal variation of additional frequencies [PDF]

, 2014
We search for signs of period doubling in CoRoT RR Lyrae stars. The occurrence of this dynamical effect in modulated RR Lyrae stars might help us to gain more information about the mysterious Blazhko effect.
Baglin, A., Benkő, J. M., Borgne, J. -F. Le, Chapellier, E., Guggenberger, E., Kolenberg, K., Paparó, M., Poretti, E., Szabó, R., Weiss, W. W.   +9 more
core   +2 more sources

Photometric Metallicity and Distance Estimates for ∼136,000 RR Lyrae Stars from Gaia Data Release 3

The Astrophysical Journal, 2023
We present a sample of 135,873 RR Lyrae stars (RRLs) with precise photometric metallicity and distance estimates from our newly calibrated P – ϕ _31 – R _21 –[Fe/H]/ P – R _21 –[Fe/H] and G -band absolute magnitude–metallicity relations.
Xin-Yi Li, Yang Huang, Gao-Chao Liu, Timothy C. Beers, Hua-Wei Zhang   +4 more
doaj   +1 more source

The Variable Stars of the Draco Dwarf Spheroidal Galaxy - Revisited [PDF]

, 2008
We present a CCD survey of variable stars in the Draco dwarf spheroidal galaxy. This survey, which has the largest areal coverage since the original variable star survey by Baade & Swope, includes photometry for 270 RR Lyrae stars, 9 anomalous Cepheids ...
A. P. LaCluyzé, Aparicio, Azzopardi, Bellazzini, Bonanos, C. L. Clark, Cacciari, Cacciari, Catelan, Catelan, Clement, Clement, Clement, Dall'Ora, Goranskij, H. C. Harris, Hilker, Horace A. Smith, Jurcsik, Jurcsik, K. Kinemuchi, Kinemuchi, L. A. Snyder, Margon, N. A. Silbermann, Nemec, Oosterhoff, Petersen, Pritzl, Pritzl, Pritzl, Reimann, Rood, Sandage, Schlegel, Schneider, Shetrone, Simon, Smith, Stothers   +39 more
core   +2 more sources