Browsing University of Hertfordshire by Author "Lyubchik, Yuri"

Now showing items 1-3 of 3

    • AlH lines in the blue spectrum of Proxima Centauri 

      Pavlenko, Yakiv V.; Tennyson, Jonathan; Yurchenko, Sergei N.; Schmidt, Mirek R.; Jones, Hugh R. A.; Lyubchik, Yuri; Mascareño, A. Suárez (2022-11-30)
      The recently-computed ExoMol line lists for isotopologues of AlH are used to analyse the blue spectrum (4000-4500 {\AA}) of Proxima Cen (M5.5 V). Comparison of the observed and computed spectra enables the identification ...

    • A blue depression in the optical spectra of M dwarfs 

      Jones, Hugh R. A.; Pavlenko, Yakiv; Lyubchik, Yuri; Bessell, Mike; Allard, Nicole; Pinfield, David J. (2023-05-12)
      A blue depression is found in the spectra of M dwarfs from 4000 to 4500A. This depression shows an increase toward lower temperatures though is particularly sensitive to gravity and metallicity. It is the single most ...

    • Values of v sin i-s for late-type stars from spectral synthesis in the K-band region. 

      Lyubchik, Yuri; Jones, H.R.A.; Pavlenko, Yakiv V.; Pinfield, D.J.; Covey, Kevin R. (2012-05)
      We analyse medium-resolution spectra (R similar to 18 000) of 19 late type dwarfs in order to determine v sin i values using synthetic rather than observational template spectra. For this purpose, observational data around ...