AbstractUltraviolet spectra of β Cas (Sp F2 III–IV) were acquired with the International Ultraviolet Explorer (IUE) satellite. The observed flux level changes rapidly from F λ ≈ 2.5 · 10−13 to 2.0 · 10−10 erg/cm2/s/Å at λ = 1280 A ̊ and 3000 Å, respectively. Chromospheric emission in UV spectra is seen both in spectral lines (e.g. SiIV 1400, CIV 1550, MgII 2800 Å) and continuum (for λ < 1700 A ̊ ). To obtain the basic photospheric parameters of this star we took the mean IUE spectrum only for λ > 2300 A ̊ as well as the ground based observations in the spectral range of 3200–10800 Å. We found log Teff = 3.85, log g = 3.40, log L/L⊙ = 1.43 and θ = 2.0 mas. β Cas is a δ Scuti variable and time sequences of the low resolution SWP (1150–1950 Å) spectra and high resolution LWP (1900–3200 Å) spectra made in the large aperture allowed us to construct the light curves at selected wavelength passbands. In general, the amplitude grows with decreasing wavelength. Our results also indicate pulsational variability of the lower chromosphere, as seen at λ < 1700 A ̊ .


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Far-Ultraviolet light curves of the δ Scuti variable: β Cassiopeiae


    Beteiligte:
    Daszyńska, J. (Autor:in) / Cugier, H. (Autor:in)

    Erschienen in:

    Advances in Space Research ; 31 , 2 ; 381-386


    Erscheinungsdatum :

    01.01.2002


    Format / Umfang :

    6 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch




    Far-Ultraviolet Light Curves of the delta Scuti Variable: beta Cassiopeiae

    Daszynska, J. / Cugier, H. / The Committee on Space Research | British Library Conference Proceedings | 2002


    The ultraviolet variations of Iota Cassiopeiae

    Molnar, M. R. / Mallama, A. D. / Soskey, D. G. et al. | NTRS | 1976


    The X-ray emission of the γ Cassiopeiae stars

    Smith, Myron A | Online Contents | 2016


    The X-ray emission of the gamma Cassiopeiae stars

    Smith, Myron A | Online Contents | 2015