Publication type: Refereed

  • Publication
    A stronger He II 4686 in the spectrum of the planetary nebula NGC 6572
    On a recent spectrogram of the planetary nebula NGC 6572 the authors have found He II 4686 clearly in emission. They review previous descriptions of the...
  • Publication
    A Strongly Heated Neutron Star in the Transient Z Source MAXI J0556-332
    We present Chandra, XMM-Newton, and Swift observations of the quiescent neutron star in the transient low-mass X-ray binary MAXI J0556-332. Observations of the...
  • Publication
    A Study of Activity in F-Type Main-Sequence Stars Using the D/3 Line of Hei
    We have observed the He I D3 λ 5876 Å line as a chromospheric activity indicator in 36 stars (34 F-type and 2 G-type) belonging to the Hyades open cluster, the...
  • Publication
    A study of catalogued nearby galaxy clusters in the SDSS-DR4. I. Cluster global properties
    Context: Large surveys such as the Sloan Digital Sky Survey have made large amounts of spectroscopic and photometric data of galaxies available, thereby...
  • Publication
    A study of catalogued nearby galaxy clusters in the SDSS-DR4. II. Cluster substructure
    Context. According to the current cosmological paradigm, large scale structures form hierarchically in the Universe. Clusters of galaxies grow through a...
  • Publication
    A study of correlation between the oscillation amplitude and stellar parameters of delta Scutis in open clusters. Toward selection rules for delta Scuti star oscillations
    In the present work, we study correlations between stellar fundamental parameters and the oscillation amplitude for delta Scuti stars. We present this study for...
  • Publication
    A study of emission lines variability of the active galaxy PKS 0521-365.
    Optical spectrophotometry of the active galaxy PKS 0521-365 over a period of 7 years is reported, together with the analysis of IUE archival spectra. The Hα...
  • Publication
    A study of extragalactic planetary nebulae populations based on spectroscopy. I. Data compilation and first findings
    We compile published spectroscopic data and [O III] magnitudes of almost 500 extragalactic planetary nebulae (PNe) in 13 galaxies of various masses and...
  • Publication
    A study of flares in the ultra-cool regime from SPECULOOS-South
    We present a study of photometric flares on 154 low-mass (≤0.2 M ⊙) objects observed by the SPECULOOS-South Observatory from 2018 June 1 to 2020 March 23. In...