Hostname: page-component-f554764f5-nqxm9 Total loading time: 0 Render date: 2025-04-11T00:10:38.260Z Has data issue: false hasContentIssue false
  • English
  • Français

On the Excitation Mechanism for the Nonradial Pulsations in ϵ Persei

Published online by Cambridge University Press:  12 April 2016

Eiji Kambe ,
Hideyuki Saio  and
Umin Lee
Eiji Kambe
Affiliation:
Dept. of Geoscience, Nat’l Defence Acad., Yokosuka, Kanagawa 239-8686, Japan
Hideyuki Saio
Affiliation:
Astron.Inst., School of Sci., Tohoku Univ. Sendai980-8578, Japan
Umin Lee
Affiliation:
Astron.Inst., School of Sci., Tohoku Univ. Sendai980-8578, Japan

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

We have examined whether the kappa-mechanism at the ”Z” opacity bump can excite overstable nonradial pulsation (NRP) modes such as those responsible for the line-profile variations (lpv) observed for ϵ Persei (Gies et al. 1999).

From the lpv modeling with realistic stellar parameters and the state-of-the-art codes, we confirmed that the observed lpv can generally be explained by the modes with l values suggested by Gies et al. (1999). We have also found that some tesseral modes, which have smaller m than those of sectoral modes, can reproduce the observed lpv well for the periods of 3.51hr/3.84 hr and 4.06hr/4.54 hr. Our linear non-adiabatic nonradial pulsation analysis applied to massive (13M⊙––14M⊙) stars shows that the periods of higher |m| values in the co-rotating frame are too long to be excited by the Z-bump kappa-mechanism while the smaller |m| values give marginal consistency.

Type
3. Periodic Variations
Information
International Astronomical Union Colloquium , Volume 175: The Be Phenomenon in Early-Type Stars , 2000 , pp. 284 - 287
Copyright
Copyright © Astronomical Society of the Pacific 2000

References

Caughlan, G.R., & Fowler, W.A. 1988, Atomic Data Nuclear Data Tables 40, 283 Google Scholar
Gautschy, A., & Saio, H. 1993, MNRAS 262, 213 Google Scholar
Gies, D.R., & Kullavanijaya, A. 1988, ApJ 326, 813 Google Scholar
Gies, D.R. et al 1999, ApJ, in pressGoogle Scholar
Iglesias, C.A., & Rogers, F.J. 1996, ApJ 464, 943 Google Scholar
Kambe, et al. 1999, this proceedingsGoogle Scholar
Smith, M.A., Fullerton, A.W., & Percy, J.R. 1987, ApJ 320, 768 Google Scholar
Spruit, H.C. 1992, A&A 253, 131 Google Scholar
Tarasov, A.E. et al. 1995, A&AS 110, 59 Google Scholar
Townsend, R.H.D. 1997, Ph D thesis, Univ. College London Google Scholar