2,038 datasets found

Keywords: variable stars

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  • An all-sky view of the Orphan Stream

    We use astrometry, broad-band photometry, and variability information from the Data Release 2 of ESA's Gaia mission (GDR2) to identify members of the Orphan Stream (OS) across...
  • Rotational modulation in TESS B stars

    Light curves and periodograms of 160 B stars observed by the Transiting Exoplanet Survey Satellite (TESS) space mission and 29 main-sequence B stars from Kepler and K2 were used...
  • Gaia-derived luminosities of Kepler A/F stars

    We study the fraction of stars in and around the {delta} Scuti instability strip that are pulsating, using Gaia DR2 parallaxes to derive precise luminosities. We classify a...
  • Oosterhoff dichotomy in Galactic bulge

    We present a study of the Oosterhoff (Oo) dichotomy in the Galactic bulge using 8141 fundamental-mode RR Lyrae stars. We used public photometric data from the Optical...
  • Variables in NGC 3109 dwarf irregular galaxy

    In a shallow near-infrared survey of the dwarf irregular galaxy, NGC3109, near the periphery of the Local Group, we have found eight Mira variables, seven of which appear to be...
  • Age gradients throughout the Galaxy with LPVs

    We assemble the largest sample of oxygen-rich (O-rich) Miras and associated long-period variables (LPVs) to date and highlight their importance for age dating the components of...
  • Multiwavelength observations of GD 394

    We present new Hubble Space Telescope (HST) ultraviolet and ground-based optical observations of the hot, metal-rich white dwarf GD 394. Extreme-ultraviolet (EUV) observations...
  • M5 RR Lyrae times of maxima

    Secular period variations, {beta}=dP/dt, in 76 RR Lyrae stars in the globular cluster M5 are analysed using our most recent CCD V photometry and the historical photometric data...
  • Kepler {delta} Sct stars amplitude modulation

    We present the results of a thorough search for amplitude modulation of pulsation modes in 983 {delta} Sct stars, which have effective temperatures between...
  • Field RR Lyrae stars

    This paper presents an extensive overview of known and proposed RR Lyrae stars in binaries. The aim is to revise and extend the list with new Galactic field systems. We utilized...
  • Coulour-Period relation for Cepheids

    We compare mid-infrared (IR) 3.6 and 4.5{mu}m Warm Spitzer observations for Cepheids in the Milky Way and the Large and Small Magellanic Clouds. Using models, we explore in...
  • M67 variable stars from Kepler/K2-Campaign-5

    We examine the photometric variability of stars in the M 67 field using Kepler/K2-Campaign-5 light curves. Variabilities and periods were determined for 639 stars. The mean...
  • Oxygen abundance in Galactic disc Cepheids

    We performed a non-local thermodynamic equilibrium (NLTE) analysis of the infrared oxygen triplet for a large number of Cepheid spectra obtained with the Hobby-Eberly Telescope....
  • Variability of the PGa star HD 19400

    The aim of this study is to carry out an abundance determination, to search for spectral variability and for the presence of a weak magnetic field in the typical PGa star...
  • IR photometry of NGC 1893 variables

    In this paper, we present time series photometry of 104 variable stars in the cluster region NGC 1893. The association of the present variable candidates to the cluster NGC 1893...
  • Variable stars in M4 primary field

    We present the results of a photometric search for variable stars in the core of the Galactic globular cluster Messier 4 (M 4). The input data are a large and unprecedented set...
  • Mid-infrared study of RR Lyrae stars

    We present a group of 3740 previously identified RR Lyrae variables well observed with the Wide-field Infrared Survey Explorer (WISE). We explore how the shape of the generic RR...
  • SMC RR Lyrae Fourier decomposition

    We have performed the Fourier decomposition analysis of 8- and 13-yr V-band light curves of a carefully selected sample of 454 fundamental-mode RR Lyrae variables (RRab type),...
  • RR Lyrae in M32

    We present time series photometry of two fields near M32 using archival observations from the Advanced Camera for Surveys Wide Field Channel on-board the Hubble Space Telescope....
  • Variable stars in NGC 5024 (M53)

    We have performed a careful investigation of the 74 candidate variable stars presented by Safonova & Stalin (2011AJ....142..179S) . For this purpose we used our data base of...
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