scholarly journals Bisector Velocities of Hα in the roAp Star α Cir: Probing the Principal Pulsation Mode

1998 ◽  
Vol 185 ◽  
pp. 309-310
Author(s):  
I. K. Baldry ◽  
T. R. Bedding ◽  
M. Viskum ◽  
H. Kjeldsen ◽  
S. Frandsen
Keyword(s):  
Dipole Mode ◽  
Principal Mode ◽  
Pulsation Mode ◽  
Roap Star

α Circini is the brightest of the known rapidly oscillating Ap (roAp) stars. Previous observations of this star in photometry (Kurtz et al. 1994) have shown that it has one dominant pulsation mode, which is a pure oblique dipole mode (ℓ = 1) with a frequency of 2442 μHz (P = 6.825 min). Kurtz et al. (1994) measured the amplitude of the principal mode to be 2.55 mmag (Strömgren v).

scholarly journals A tidally tilted sectoral dipole pulsation mode in the eclipsing binary TIC 63328020

2021 ◽  
Author(s):  
S A Rappaport ◽  
D W Kurtz ◽  
G Handler ◽  
D Jones ◽  
L A Nelson ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Orbital Period ◽  
Mode Frequency ◽  
Prior History ◽  
Dipole Mode ◽  
Eclipsing Binary ◽  
Pulsation Mode ◽  
The Third ◽  
History Of ◽  
Binary Evolution

Abstract We report the discovery of the third tidally tilted pulsator, TIC 63328020. Observations with the TESS satellite reveal binary eclipses with an orbital period of 1.1057 d, and δ Scuti-type pulsations with a mode frequency of 21.09533 d−1. This pulsation exhibits a septuplet of orbital sidelobes as well as a harmonic quintuplet. Using the oblique pulsator model, the primary oscillation is identified as a sectoral dipole mode with l = 1, |m| = 1. We find the pulsating star to have M1 ≃ 2.5 M⊙, R1 ≃ 3 R⊙, and Teff, 1 ≃ 8000 K, while the secondary has M2 ≃ 1.1 M⊙, R2 ≃ 2 R⊙, and Teff, 2 ≃ 5600 K. Both stars appear to be close to filling their respective Roche lobes. The properties of this binary as well as the tidally tilted pulsations differ from the previous two tidally tilted pulsators, HD74423 and CO Cam, in important ways. We also study the prior history of this system with binary evolution models and conclude that extensive mass transfer has occurred from the current secondary to the primary.

scholarly journals Radial Pulsation of the roAp Star HD 122970?

2000 ◽  
Vol 176 ◽  
pp. 490-491
Author(s):  
G. Handler ◽  
E. Paunzen ◽  
R. Garrido ◽  
J. A. Guzik ◽  
T. E. Beach ◽  
...  
Keyword(s):  
Frequency Analysis ◽  
Asymptotic Theory ◽  
Radial Mode ◽  
Radial Pulsation ◽  
Dipole Mode ◽  
Roap Star

AbstractWe acquired multisite observations of the newly discovered rapidly oscillating Ap star HD 122970. A frequency analysis shows the presence of two independent modes, one singlet and one equally spaced triplet. By applying the oblique pulsator model and asymptotic theory we infer that the triplet originates from a distorted dipole mode and that the singlet most probably corresponds to a radial mode.

Measurement of losses in multiconductor cable transmitting in the dipole-mode

1980 ◽  
Vol 127 (5) ◽  
pp. 270
Author(s):  
E. Sugimoto ◽  
H.M. Barlow ◽  
J.B. Davies
Keyword(s):  
Dipole Mode

Dipole-mode optical vector solitons

2002 ◽  
Author(s):  
Y.S. Kivshar ◽  
E.A. Ostrovskaya ◽  
J.J. Garcia-Ripoll ◽  
V.M. Perez-Garcia ◽  
W. Krolikowski ◽  
...  
Keyword(s):  
Dipole Mode

scholarly journals KIC 7582608: a new Kepler roAp star with frequency variability

2014 ◽  
Vol 443 (3) ◽  
pp. 2049-2062 ◽  
Author(s):  
Daniel L. Holdsworth ◽  
B. Smalley ◽  
D. W. Kurtz ◽  
J. Southworth ◽  
M. S. Cunha ◽  
...  
Keyword(s):  
Roap Star

ProgramCRYC3Dfor geometric computing in crystallography

2008 ◽  
Vol 41 (2) ◽  
pp. 479-480 ◽  
Author(s):  
Ludmila Urzhumtseva ◽  
Alexandre Urzhumtsev
Keyword(s):  
Computer Program ◽  
Three Dimensional ◽  
Teaching Tool ◽  
Online Help ◽  
Principal Mode ◽  
Geometric Characteristics ◽  
Simple Program ◽  
Or Groups ◽  
Geometric Objects ◽  
Everyday Work

The computer programCRYC3Dworks with three-dimensional crystallographic geometric objects or groups of them and calculates their basic geometric characteristics by a simple click in the menu. In particular, this includes vector operations in both direct and reciprocal spaces and cell transformations. Collecting basic crystallographic operations in a single and simple program helps crystallographers to avoid looking for `fast-and-dirty' scripts or using large and unwieldy packages and may be useful in everyday work. When running the program in its principal mode, macro-operations are accompanied by a list of elementary geometric operations. This feature, together with the presence of a single-command mode and online help, may be useful also as a teaching tool.

scholarly journals Spectroscopy of the roAp star   Cir - II. The bisector and equivalent width of the H  line

1999 ◽  
Vol 302 (2) ◽  
pp. 381-390 ◽  
Author(s):  
I. K. Baldry ◽  
M. Viskum ◽  
T. R. Bedding ◽  
H. Kjeldsen ◽  
S. Frandsen
Keyword(s):  
Equivalent Width ◽  
Roap Star
Sign in / Sign up

Export Citation Format

Share Document