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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Search for Northern Hemisphere Rapidly Oscillating Ap stars

V, Girish 04 1900 (has links)
Rapidly oscillating Ap (roAp) stars are cool, magnetic, chemically peculiar A-F type stars which exhibit high frequency oscillations similar to that of the famous five minute oscillations of Sun. These oscillations are interpreted as low degree (l<3), high order (n >10-30), non-radial p-mode oscillations. The periods of these pulsations lie in the range of 4-16 minutes with typical amplitudes of few milli-magnitudes (< 8mmag) in the Johnson-B filter. More than a dozen roAp stars are multiperiodic, making them suitable for asteroseismology. The presence of high magnetic fields (of the order of few kG) in these stars gives us a chance to study the effects of magnetic fields on pulsations. The thesis presents the efforts to search for new roAp stars in the northern hemisphere and its results.

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