Results 61 to 70 of about 23,538 (190)

HST Snaphot Study of Variable Stars in Globular Clusters: Inner Region of NGC 6441

, 2003
[Abridged] We present the results of a Hubble Space Telescope snapshot program to survey the inner region of the globular cluster NGC 6441 for its variable stars.
Allen V. Sweigart, Andrew C. Layden, Barton J. Pritzl, Bono G., Borissova J., Castellani V., Clement C. M., Demers S., Dickens R. J., Gingold R. A., Horace A. Smith, Kaluzny J., Kinman T. D., Kwee K. K., Lee S. W., Longmore A. J., Moehler S., Mrcio Catelan, Oosterhoff P. Th., Peter B. Stetson, Pike C. D., Pinto G., R. Michael Rich, Renzini A., Russeva T., Russeva T., Russeva T., Sweigart A. V., Wehlau A., Wehlau A.   +29 more
core   +1 more source

Constraints on the Distance Moduli, Helium and Metal Abundances, and Ages of Globular Clusters from their RR Lyrae and Non-variable Horizontal-branch Stars. III. M55 and NGC 6362 [PDF]

Astrophysical Journal, 2018
M55 (NGC 6809) and NGC 6362 are among the few globular clusters for which masses and radii have been derived to high precision for member binary stars.
D. VandenBerg, P. Denissenkov
semanticscholar   +1 more source

Wide-field variability survey of the globular cluster NGC 4833

, 2013
We present preliminary results of the variability survey in the field of the glo bular cluster NGC 4833. We observed all 34 variable stars known in the cluster.
Kopacki, Grzegorz
core   +1 more source

Variable stars in local group galaxies – IV. RR Lyrae stars in the central regions of the low-density galaxy Crater II [PDF]

Monthly notices of the Royal Astronomical Society, 2018
We present a search and analysis of variable stars in the recently discovered Crater~II dwarf galaxy. Based on $B$, $V$, $I$ data collected with the Isaac Newton Telescope (FoV$\sim$0.44 square degrees) we detected 37 variable stars, of which 34 are bone-
M. Monelli, A. Walker, C. Martínez-Vázquez, P. Stetson, C. Gallart, E. Bernard, G. Bono, A. K. Vivas, G. Andreuzzi, M. Dall’ora, G. Fiorentino, A. Dorta   +11 more
semanticscholar   +1 more source

Variable stars in Terzan 5: additional evidence of multi-age and multi-iron stellar populations [PDF]

, 2018
Terzan 5 is a complex stellar system in the Galactic bulge, harboring stellar populations with very different iron content ({\Delta}[Fe/H] ~1 dex) and with ages differing by several Gyrs. Here we present an investigation of its variable stars.
-, Contreras, R. R., Dalessandro, E., Ferraro, F. R., Fiorentino, G., Lanzoni, B., Massari, D., Matsunaga, N., Mucciarelli, A., Origlia, L., Rich, R. M.   +10 more
core   +3 more sources

Pulsation Properties of Blazhko and Non-Blazhko RRab Stars

The Astrophysical Journal Supplement Series
In this study, we conduct a comparative analysis of the properties of Blazhko and non-Blazhko RRab stars. We identified 1054 non-Blazhko and 785 Blazhko RRab stars in the photometric data observed by the K2 mission, which, combined with those 37 stars ...
Peng Zong, Jian-Ning Fu, Jie Su, Bing-Kai Zhang, Gao-Chao Liu, Weichao Sun, Jiaxin Wang, Bo Zhang, Xueying Hu, Zhongrui Bai, Weikai Zong   +10 more
doaj   +1 more source

On the Use of Field RR Lyrae as Galactic Probes. V. Optical and Radial Velocity Curve Templates

The Astrophysical Journal, 2021
We collected the largest spectroscopic catalog of RR Lyrae (RRLs) including ≈20,000 high-, medium-, and low-resolution spectra for ≈10,000 RRLs. We provide the analytical forms of radial velocity curve (RVC) templates.
V. F. Braga, J. Crestani, M. Fabrizio, G. Bono, C. Sneden, G. W. Preston, J. Storm, S. Kamann, M. Latour, H. Lala, B. Lemasle, Z. Prudil, G. Altavilla, B. Chaboyer, M. Dall’Ora, I. Ferraro, C. K. Gilligan, G. Fiorentino, G. Iannicola, L. Inno, S. Kwak, M. Marengo, S. Marinoni, P. M. Marrese, C. E. Martínez-Vázquez, M. Monelli, J. P. Mullen, N. Matsunaga, J. Neeley, P. B. Stetson, E. Valenti, M. Zoccali   +31 more
doaj   +1 more source

Variable stars in the globular cluster M28 (NGC 6626)

, 2012
We present a new search for variable stars in the Galactic globular cluster M28 (NGC 6626). The search is based on a series of BVI images obtained with the SMARTS Consortium's 1.3m telescope at Cerro Tololo Inter-American Observatory, Chile.
Alonso-Garcia, J., Catelan, M., Prieto, G., Pritzl, B. J., Ramos, R. Contreras, Smith, H. A.   +5 more
core   +1 more source

The Determination Of Reddening From Intrinsic VR Colors Of RR Lyrae Stars [PDF]

, 2009
New R-band observations of 21 local field RR Lyrae variable stars are used to explore the reliability of minimum light (V-R) colors as a tool for measuring interstellar reddening.
Alcock, Andrea Kunder, Andrew Layden, Beers, Bookmeyer, Brian Chaboyer, Clement, Collinge, Fitch, Gould, Hurta, Ivezić, Kanbur, Kholopov, Kunder, Kunder, Kunder, Layden, Lub, Paczyński, Piersimoni, Pojmanski, Popowski, Popowski, Popowski, Schlegel, Schmidt, Stanek, Stutz, Szabados, Szeidl, Udalski, Vandenbroere, Vivas, Warner   +34 more
core   +3 more sources

The RR Lyrae Luminosity Metallicity Relation Revisited

The Astronomical Journal
We utilize a set of internally consistent absolute ages for a sample of ten Galactic globular clusters to determine the variation of the slope with the zero point of the M _V (RR) ∼ [Fe/H] relation for RR Lyrae variables.
Ata Sarajedini
doaj   +1 more source