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Possible evidence of surface vibration of strange stars from stellar observations

Authors

  • Subharthi Ray,

    Corresponding author
    1. Inter University Centre for Astronomy and Astrophysics, Post Bag 4, Pune 411007, India
    2. The Abdus Salam International Center for Theoretical Physics, 34100 Trieste, Italy
    3. Instituto di Fisica, Universidade Federal Fluminense, Niteroi 24210-340, Rio de Janeiro, Brazil
      E-mail: sray@iucaa.ernet.in
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  • Jishnu Dey,

    1. Inter University Centre for Astronomy and Astrophysics, Post Bag 4, Pune 411007, India
    2. UGC Research Professor, Department of Physics, Maulana Azad College, 8 Rafi Ahmed Kidwai Road, Kolkata 700 013, India
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  • Mira Dey,

    1. Inter University Centre for Astronomy and Astrophysics, Post Bag 4, Pune 411007, India
    2. Department of Physics, Presidency College, 86/1 College Street, Kolkata 700 073, India
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  • Siddhartha Bhowmick

    1. Inter University Centre for Astronomy and Astrophysics, Post Bag 4, Pune 411007, India
    2. Department of Physics, Barasat Government College, Barasat, North 24 Paraganas, W. Bengal, India
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E-mail: sray@iucaa.ernet.in

ABSTRACT

Emission lines in the eV and keV range by certain stellar candidates from their recent analysis invoke the question of their possible origin. The stars under consideration are 4U 0614+091 (0.65, 0.86 and 1.31 keV), 2S 0918−549 (0.8 keV with width 55 eV), 4U 1543−624 (0.7 keV), 4U 1850 −087 (0.7 keV) and 4U 1820−30 (0.6 and 0.9 keV) and also the 0.6-keV excess emission in RX J170930.2−263927. Recently, it has been suggested that the resonance absorption at ∼ 0.7, 1.4, 2.1 and 2.8 keV in 1E1207−5209 and 0.35, 0.7 and 1.4 keV in RX J1856.5−3754 are due to harmonic surface vibrations in strange stars. We propose that these harmonic vibrations may also be responsible for emission lines in the above mentioned compact stellar candidates.

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