2000A&A...359..635L -
Astronomy and Astrophysics, volume 359, 635-638 (2000/7-2)
A spectroscopic study of the magnetic chemically peculiar star νFornacis.
LEONE F., CATANZARO G. and MALARODA S.
Abstract (from CDS):
The magnetic chemically peculiar star ν Fornacis is known to be a periodic magnetic and luminosity variable. In the framework of the Oblique Rotator Model, ν For presents a mainly dipolar magnetic field, whose symmetry axis is tilted with respect to the rotational axis, non solar abundances and a non homogeneous distribution of elements on the stellar surface. The variability period is the stellar rotational period. Thus, spectral variabilities are also expected for this star. By analysing the Hipparcos photometry and data from the literature, the luminosity period of ν For has been found equal to 1.89232 days. This value also represents the variability of the effective magnetic field measurements available in the literature. To investigate the, up to now unknown, spectroscopic behaviour of ν For, we have performed time-resolved spectroscopy of this star in the 400-600nm range. The equivalent widths are found to be also variable with the previous period and have been used to derive abundances. Phase relations, between light, spectral and magnetic variabilities have been established. According to the hypothesis that light variations are due to a non-homogeneous distribution of elements on the stellar surface and high metallicity regions are responsible for blocking of ultraviolet flux and its redistribution towards the visible wavelengths, iron is the main origin of the light variability.
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Journal keyword(s):
stars: abundances - stars: chemically peculiar - stars: individual: HD 12767 - stars: magnetic fields
(Ref) Object type as listed in the reference "Ref"
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ra dec : right ascension and declination (unit and frame defined according to your Output Options)
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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 (148 between 1850 and 2024) (Total 148)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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