Most detects g-modes in the Be star HD 163868

G. A.H. Walker; R. Kuschnig; J. M. Matthews; C. Cameron; H. Saio; U. Lee; E. Kambe; S. Masuda; D. B. Guenther; A. F.J. Moffat; S. M. Rucinski; D. Sasselov; W. W. Weiss

doi:10.1086/499362

Most detects g-modes in the Be star HD 163868

G. A.H. Walker, R. Kuschnig, J. M. Matthews, C. Cameron, H. Saio, U. Lee, E. Kambe, S. Masuda, D. B. Guenther, A. F.J. Moffat, S. M. Rucinski, D. Sasselov, W. W. Weiss

Research output: Contribution to journal › Article › peer-review

68 Citations (Scopus)

Abstract

We have extracted a 37 day light curve with a precision of 0.0012 mag per point for the Microvariability and Oscillations of Stars (MOST) guide star, HD 163868 (B5 Ve). Its rich frequency spectrum resembles that of a slowly pulsating B (SPB) star but, being a rapid rotator, we designate it SPBe. The 60 most significant periods lie in three distinct groups centered on 8 days and 14 and 7 hr. We demonstrate that the 14 and 7 hr periods can be modeled by two swarms of high-order, prograde sectorial g-modes (m = -1, -2), which are destabilized by the iron opacity bump. Our model also predicts a group of r-modes with periods near 2.3 days, which correspond to frequencies observed in the tail of the 8 day group. The remaining periodicities, between 7 and 11 days, cannot be explained by unstable modes in our model.

Original language	English
Pages (from-to)	L77-L80
Journal	Astrophysical Journal
Volume	635
Issue number	1 II
DOIs	https://doi.org/10.1086/499362
Publication status	Published - 2005 Dec 10
Externally published	Yes

Keywords

Stars: early-type
Stars: emission-line, Be - Stars: individual (HD 163868)
Stars: oscillations
Stars: rotation

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1086/499362

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title = "Most detects g-modes in the Be star HD 163868",

abstract = "We have extracted a 37 day light curve with a precision of 0.0012 mag per point for the Microvariability and Oscillations of Stars (MOST) guide star, HD 163868 (B5 Ve). Its rich frequency spectrum resembles that of a slowly pulsating B (SPB) star but, being a rapid rotator, we designate it SPBe. The 60 most significant periods lie in three distinct groups centered on 8 days and 14 and 7 hr. We demonstrate that the 14 and 7 hr periods can be modeled by two swarms of high-order, prograde sectorial g-modes (m = -1, -2), which are destabilized by the iron opacity bump. Our model also predicts a group of r-modes with periods near 2.3 days, which correspond to frequencies observed in the tail of the 8 day group. The remaining periodicities, between 7 and 11 days, cannot be explained by unstable modes in our model.",

keywords = "Stars: early-type, Stars: emission-line, Be - Stars: individual (HD 163868), Stars: oscillations, Stars: rotation",

author = "Walker, {G. A.H.} and R. Kuschnig and Matthews, {J. M.} and C. Cameron and H. Saio and U. Lee and E. Kambe and S. Masuda and Guenther, {D. B.} and Moffat, {A. F.J.} and Rucinski, {S. M.} and D. Sasselov and Weiss, {W. W.}",

year = "2005",

month = dec,

day = "10",

doi = "10.1086/499362",

language = "English",

volume = "635",

pages = "L77--L80",

journal = "Astrophysical Journal",

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TY - JOUR

T1 - Most detects g-modes in the Be star HD 163868

AU - Walker, G. A.H.

AU - Kuschnig, R.

AU - Matthews, J. M.

AU - Cameron, C.

AU - Saio, H.

AU - Lee, U.

AU - Kambe, E.

AU - Masuda, S.

AU - Guenther, D. B.

AU - Moffat, A. F.J.

AU - Rucinski, S. M.

AU - Sasselov, D.

AU - Weiss, W. W.

PY - 2005/12/10

Y1 - 2005/12/10

N2 - We have extracted a 37 day light curve with a precision of 0.0012 mag per point for the Microvariability and Oscillations of Stars (MOST) guide star, HD 163868 (B5 Ve). Its rich frequency spectrum resembles that of a slowly pulsating B (SPB) star but, being a rapid rotator, we designate it SPBe. The 60 most significant periods lie in three distinct groups centered on 8 days and 14 and 7 hr. We demonstrate that the 14 and 7 hr periods can be modeled by two swarms of high-order, prograde sectorial g-modes (m = -1, -2), which are destabilized by the iron opacity bump. Our model also predicts a group of r-modes with periods near 2.3 days, which correspond to frequencies observed in the tail of the 8 day group. The remaining periodicities, between 7 and 11 days, cannot be explained by unstable modes in our model.

AB - We have extracted a 37 day light curve with a precision of 0.0012 mag per point for the Microvariability and Oscillations of Stars (MOST) guide star, HD 163868 (B5 Ve). Its rich frequency spectrum resembles that of a slowly pulsating B (SPB) star but, being a rapid rotator, we designate it SPBe. The 60 most significant periods lie in three distinct groups centered on 8 days and 14 and 7 hr. We demonstrate that the 14 and 7 hr periods can be modeled by two swarms of high-order, prograde sectorial g-modes (m = -1, -2), which are destabilized by the iron opacity bump. Our model also predicts a group of r-modes with periods near 2.3 days, which correspond to frequencies observed in the tail of the 8 day group. The remaining periodicities, between 7 and 11 days, cannot be explained by unstable modes in our model.

KW - Stars: early-type

KW - Stars: emission-line, Be - Stars: individual (HD 163868)

KW - Stars: oscillations

KW - Stars: rotation

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U2 - 10.1086/499362

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SP - L77-L80

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1 II

ER -

Most detects g-modes in the Be star HD 163868

Abstract

Keywords

ASJC Scopus subject areas

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