2000A&A...359..635L


Query : 2000A&A...359..635L

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.

Abstract Copyright:

Journal keyword(s): stars: abundances - stars: chemically peculiar - stars: individual: HD 12767 - stars: magnetic fields

Simbad objects: 1

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Number of rows : 1
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 * nu. For a2* 02 04 29.4386071 -29 17 48.547752 4.01 4.52 4.69 4.73 4.87 B9.5IIIspSi 143 0

Query : 2000A&A...359..635L

Basic data :
* nu. For -- Variable Star of alpha2 CVn type
Origin of the objects types :

(Ref) Object type as listed in the reference "Ref"
(acronym) Object type linked to the acronym according to the original reference
() Anterior to 2007, before we can link the objet type to a reference, or given by the CDS team in some particular cases

Other object types:
* (HD,*,...), a2* (2003AstL), V* (V*), IR (2MASS), UV (TD1)
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)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
ICRS coord. (ep=J2000) :
02 04 29.4386071 -29 17 48.547752 (Optical) [ 0.19 0.16 90 ] A 2007A&A...474..653V
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)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
FK4 coord. (ep=B1950 eq=1950) :
02 02 14.9537928 -29 32 09.680552 [ 0.19 0.16 90 ]
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)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
Gal coord. (ep=J2000) :
224.8876630500 -73.7780194767 [ 0.19 0.16 90 ]
Syntax of proper motions is : "pm-ra pm-dec [error ellipse] quality bibcode"
  • pm-ra : mu-ra*cos(dec) (expressed in the ICRS system in mas/yr)
  • pm-dec : mu-dec (expressed in the ICRS system in mas/yr)
  • [error ellipse] : error major axis and minor axis (in mas), orientation angle (in deg)
  • quality : flag of quality (A=best quality -> E=worst quality, {� } =unknown quality)
  • bibcode : bibcode of the proper motion reference
Proper motions mas/yr :
12.79 8.48 [0.20 0.17 90] A 2007A&A...474..653V
Syntax of radial velocity (or/and redshift) is : "value [error] (wavelength) quality bibcode"
  • value : radial velocity or/and redshift (Heliocentric frame) according to your Output Options
    (redshift may be not displayed if the data value is <0 and the database inside value is a radial velocity)
  • [error] : error of the corresponding value displayed before
  • (wavelength) : wavelength range of the measurement : Rad, mm, IR, Opt, UV, Xray, Gam or  '∼'(unknown)
  • quality : flag of quality ( A=best quality -> E=worst quality, {� } =unknown quality)
  • bibcode : bibcode of the value's origin
Radial velocity / Redshift / cz :
V(km/s) 18.5 [2] / z(~) 0.000062 [0.000007] / cz 18.50 [2.00]
   E 1953GCRV..C......0W
Syntax of parallax is : 'value quality [error] bibcode'
  • value : parallax value
  • quality : flag of quality (A=best quality -> E=worst quality, {� } =unknown quality)
  • [error] : mean error
  • bibcode : bibcode of the parallax reference
Parallaxes (mas):
8.79 [0.26] A 2007A&A...474..653V
Spectral type is made of 3 parts: %coding is composed of 4 parts :
  • the spectral type, which is made of a temperature class, eventually a luminosity class (roman number) and/or spectral peculiarities;
  • a quality letter: A=best quality→E=worst quality, {� } =unknown quality %
  • a quality letter: A=best quality -> E=worst quality, {� } =unknown quality
  • bibcode : bibcode of the spectral type reference
Spectral type:
B9.5IIIspSi C 1995ApJS...99..135A
Syntax of fluxes (or magnitudes) is : "filter-name (System) flux-value [error] quality MultVarFlags bibcode"
  • filter-name : U, B, V, R, I, G, J, H, K, u, g, r, i, z
  • (System) : may be AB (default is Vega)
  • flux-value : value of flux or magnitude
  • [error] : error value
  • quality : flag of quality of the flux value ( A=best quality -> E=worst quality, {� } =unknown quality)
  • MultVarFlags : Mult is zero or one char (J) for joined photometry ; Var can be zero or two chars (V[0-4])
  • bibcode : bibcode of the flux reference
Fluxes (9) :
U 4.01 [~] C 2002yCat.2237....0D
B 4.52 [~] C 2002yCat.2237....0D
V 4.69 [~] C 2002yCat.2237....0D
R 4.73 [~] C 2002yCat.2237....0D
G 4.6383 [0.0059] C 2018yCat.1345....0G
I 4.87 [~] C 2002yCat.2237....0D
J 5.00 [~] C 2002yCat.2237....0D
H 5.048 [0.031] C 2003yCat.2246....0C
K 5.015 [0.023] C 2003yCat.2246....0C
SIMBAD within arcmin
', {sourceSize:12, color:'#30a090'})); aladin.on('objectClicked', function(object) { var objName=object.data.MAIN_ID; aladin.showPopup(object.ra,object.dec,'',''+ objName+''); });" title="Show Simbad objects"> Overlay Simbad points in this preview
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within arcsec The VizieR photometry tool allows for easy visualization of photometry points extracted around the Simbad position from photometry-enabled catalogues in VizieR.
The search radius has to be specified by the user. It is currently limited to a maximum of 30 arcsec. It depends mostly on the precision or quality of the coordinates (SIMBAD and VizieR catalogs), the resolution of the images from which the sources were extracted, source extent, and source crowding.
Suggestions are: crowded field: 0.5 to 1.5 arcsec, 3 arcsec otherwise; uncertain coordinates (SIMBAD quality E or coordinates without reference): 5 to 30 arsec (risky!).
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Hierarchy : number of linked objects
whatever the membership probability is (see description here ) :

: 1 : 289 Display criteria :

The link on the acronym of the identifiers give access to the information for this acronym in the dictionary of nomenclature.
Identifiers (34) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

HD 12767 HIC 9677 ROT 291 UBV M 8671
* nu. For HIP 9677 SACS 43 uvby98 100012767
CD-29 706 HR 612 SAO 167532 V* nu. For
CPD-29 225 JP11 584 SKY# 3048 WEB 2031
FK5 1055 2MASS J02042943-2917484 SRS 31055 YZ 119 778
GC 2506 N30 428 TD1 1210 [PS72] 362
GCRV 1146 PMC 90-93 693 TIC 72586907 Gaia DR2 5021010046848175616
GEN# +1.00012767 PPM 244617 TYC 6432-2329-1
GSC 06432-02329 Renson 3260 UBV 2107

References (143 between 1850 and 2022) (Total 143)
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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Collections of Measurements


velocities : 6    diameter : 1    distance : 1    ROT : 3    Fe_H : 2    PLX : 3    PM : 5    MK : 7   

   


External archives :

Archive data at HEASARC - High-Energy Astrophysics Science Archive Research Center

Link by name to the catalogue in VizieR :

HD 12767 CD-29 706 CPD-29 225 FK5 1055 GSC 06432-02329
HIC 9677 HIP 9677 HR 612 2MASS J02042943-2917484 PPM 244617
SAO 167532 TD1 1210 TYC 6432-2329-1 uvby98 100012767 V* nu. For
Gaia DR2 5021010046848175616

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2022.05.22-21:38:02

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