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{{Context|date=October 2009}} | |||
'''Frequency separation''' is a term used in [[Helioseismology|Helio]] and [[Asteroseismology]] for the spacing in frequency between adjacent modes of oscillation having the same [[angular degree]] (l) but different [[radial order]] (n). | |||
For a sun-like star the frequency can be further described using the 'large frequency spacing' between modes of different radial order (136 μHz in the sun), and the 'small frequency spacing' between modes of even and odd angular degree within the same radial order (9.0 μHz in the sun). The period corresponding to the large frequency spacing can be shown to be approximately the same as the time required for a sound wave to travel to the centre of the sun and return, confirming the global nature of the oscillations seen.<ref name="sunmusic">{{cite book | |||
| last = Chaplin | |||
| first = William J. | |||
| title = Music of the Sun: The story of Helioseismology | |||
| publisher = Oneworld | |||
| year = 2006 | |||
| isbn = 1-85168-451-4 | |||
}}</ref> | |||
A further frequency separation, the rotational splitting can be seen in high-resolution solar data between modes of the same angular degree, but different azimuthal order (m). This gives information | |||
{| class="wikitable" | |||
|- | |||
! Star | |||
! Large Frequency Separation | |||
! Small Frequency Separation | |||
|- | |||
| The [[Sun]] | |||
| 136 μHz | |||
| 9.0 μHz <ref name="sunmusic" /> | |||
|- | |||
| [[Arcturus]] | |||
| 0.825 <math>\pm</math> 0.049 μHz | |||
| Not Present <ref>{{cite journal | |||
| last = Retter | |||
| first = A | |||
| coauthors = Bedding, T; Buzasi, D; Kjeldsen, H; Kiss L | |||
| title = Oscillations in Arcturus from WIRE Photometry | |||
| journal = Astrophysical Journal, Letters | |||
| volume = 591 | |||
| issue = 2 | |||
| pages = L151–L154 | |||
| date = July 2003 | |||
| doi = 10.1086/377211 |arxiv = astro-ph/0306056 |bibcode = 2003ApJ...591L.151R }}</ref> | |||
|} | |||
== References == | |||
<references/> | |||
[[Category:Seismology measurement]] | |||
[[Category:Astrophysics]] | |||
Revision as of 06:11, 25 December 2013
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Frequency separation is a term used in Helio and Asteroseismology for the spacing in frequency between adjacent modes of oscillation having the same angular degree (l) but different radial order (n).
For a sun-like star the frequency can be further described using the 'large frequency spacing' between modes of different radial order (136 μHz in the sun), and the 'small frequency spacing' between modes of even and odd angular degree within the same radial order (9.0 μHz in the sun). The period corresponding to the large frequency spacing can be shown to be approximately the same as the time required for a sound wave to travel to the centre of the sun and return, confirming the global nature of the oscillations seen.[1]
A further frequency separation, the rotational splitting can be seen in high-resolution solar data between modes of the same angular degree, but different azimuthal order (m). This gives information
| Star | Large Frequency Separation | Small Frequency Separation |
|---|---|---|
| The Sun | 136 μHz | 9.0 μHz [1] |
| Arcturus | 0.825 0.049 μHz | Not Present [2] |
References
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