2002A&A...396..911M -
Astronomy and Astrophysics, volume 396, 911-916 (2002/12-4)
Line profile variations in the δ Scuti star FG Virginis: A high number of axisymmetric modes.
MANTEGAZZA L. and PORETTI E.
Abstract (from CDS):
Five consecutive nights of high resolution spectroscopic observations of the δ Scuti star FG Vir allowed us to analyze the radial velocity and line profile variations induced by non-radial multi-mode pulsations. Ten modes were detected. All of them have a photometric counterpart (Breger et al., 1998A&A...331..271B). Preliminary identifications have been performed by means of the simultaneous fit of line-profile and light variations. Most of these modes have an axisymmetric character (m=0), one is retrograde (9.20c/d, m=1) and one is prograde with a relatively high order (21.55c/d, l=3, m=-1). The more accurate results regard the dominant mode (12.72c/d) which is axisymmetric with l=1. In this case we were able to obtain reliable estimates of its physical characteristics. The analysis of our data tends to support the idea that the stellar rotation axis probably has a rather low inclination (about 15°): this is probably the reason for the high number of observed axisymmetric modes. Hence, since the measured vsin i is 20.7km/s, we deduce that the rotation velocity should be around 80km/s and the rotational period about 1.5d.
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Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
ra dec : right ascension and declination (unit and frame defined according to your Output Options)
Grey values are increasing the original precision due to the computation of frame transformations
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Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
ra dec : right ascension and declination (unit and frame defined according to your Output Options)
Grey values are increasing the original precision due to the computation of frame transformations
(wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
[error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
position angle (in degrees North celestial pole to East)
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
ra dec : right ascension and declination (unit and frame defined according to your Output Options)
Grey values are increasing the original precision due to the computation of frame transformations
(wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
[error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
position angle (in degrees North celestial pole to East)
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References (216 between 1850 and 2024) (Total 216)
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