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Search for Northern Hemisphere Rapidly Oscillating Ap stars

Electronic Theses of Indian Institute of Science

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Title Search for Northern Hemisphere Rapidly Oscillating Ap stars
 
Creator V, Girish
 
Subject Physics
Astronomy and Astrophysics
Asteroseismology of roAp stars
 
Description 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 (l10-30), 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.
 
Publisher Indian Institute of Science
 
Contributor Seetha, S
Choudhuri, Arnab Rai
 
Date 2005-04-20T09:53:43Z
2005-04-20T09:53:43Z
2005-04-20T09:53:43Z
2005-04
 
Type Electronic Thesis and Dissertation
 
Format 2846881 bytes
application/pdf
 
Identifier http://etd.iisc.ernet.in/handle/2005/101
113198532
 
Language en
 
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