CDS

2006A&A...450.1157K

Query : 2006A&A...450.1157K

2006A&A...450.1157K - Astronomy and Astrophysics, volume 450, 1157-1171 (2006/5-2)

Recovery of the global magnetic field configuration of 78 Virginis from Stokes IQUV line profiles.

KHALACK V.R. and WADE G.A.

Abstract (from CDS):

The surface magnetic field configuration of the Ap star HD 118022 (78 Vir) has been reconstructed in the framework of the magnetic charge distribution (MCD) method from the analysis of Stokes IQUV spectra obtained using the MuSiCoS spectropolarimeter at Pic du Midi Observatory. Magnetically-sensitive Fe II lines were primarily employed in the analysis, supposing that iron is evenly distributed over the stellar surface. We show that the Stokes IQUV profile shapes and variations of 78 Vir can be approximately fit assuming a global magnetic field configuration described by a slightly decentered, inclined magnetic dipole of polar surface intensity approximately 3.3kG. The derived inclinations of the stellar rotational axis to the line of sight i=24±5° as well as to the magnetic dipole axis β=124±5° are in good agreement with previous estimations by other authors, whereas the sky-projected position angle of the stellar rotation axis Ω∼110° is reported here for the first time. In addition, several lines of Cr II and Ti II were studied, yielding evidence for non-uniform surface distributions of these elements, and magnetic field results similar to those derived from Fe.

Abstract Copyright: ∼

Journal keyword(s): stars: chemically peculiar - stars: magnetic fields - polarization - stars: individual: 78 Virginis (HD 118022)

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 - 2023 		#notes
1 * o Vir a2* 13 34 07.9318557 +03 39 32.273821 4.96 4.96 4.94 4.86 4.89 ApEuCrSr 336 0

Query : 2006A&A...450.1157K

Basic data :
* o Vir -- alpha2 CVn Variable
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: 		a2* (), * (*,AG,...), Pe* (2012MNRAS), PM* (2018yCat), V* (V*), UV (TD1), NIR (2MASS), IR (IRAS)
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) : 		13 34 07.9318557 +03 39 32.273821 (Optical) [ 0.15 0.13 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) : 		13 31 35.7596217 +03 54 54.562283 [ 0.15 0.13 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) : 		328.2681462261 +64.4098502997 [ 0.15 0.13 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 : 		45.51 -24.70 [0.16 0.14 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) -7.986 [0.0005] / z(spectroscopic) -0.000027 [0.000000] / cz -7.99 [0.00]
   (Opt) A 2018A&A...616A...7S
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): 		17.65 [0.20] 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: 		ApEuCrSr D 1999MSS...C05....0H
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 4.96 [~] C 2002yCat.2237....0D
B 4.96 [~] C 2002yCat.2237....0D
V 4.94 [~] C 2002yCat.2237....0D
R 4.86 [~] C 2002yCat.2237....0D
G 4.8536 [0.0038] C 2018yCat.1345....0G
I 4.89 [~] C 2002yCat.2237....0D
J 4.90 [~] C 2002yCat.2237....0D
H 4.90 [~] C 2002yCat.2237....0D
K 4.879 [0.020] 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!). sed-help-icon

The link on the acronym of the identifiers give access to the information for this acronym in the dictionary of nomenclature.
Identifiers (35) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

* o Vir HD 118022 PLX 3098.00 TYC 310-1430-1
* 78 Vir HIC 66200 PMC 90-93 943 UBV 12176
AG+03 1726 HIP 66200 PPM 159871 UBV M 19512
BD+04 2764 HR 5105 Renson 34020 uvby98 100118022
FK5 1351 IRAS 13316+0354 ROT 1973 V* CW Vir
GC 18335 JP11 2405 SAO 120004 WEB 11691
GCRV 8035 2MASS J13340794+0339324 SKY# 24965 YZ 3 4753
GEN# +1.00118022 N30 3093 TD1 16917 Gaia DR2 3712858597278688000
GSC 00310-01430 PLX 3098 TIC 365159284

References (336 between 1850 and 2023) (Total 336)
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 : 18    diameter : 1    distance : 1    ROT : 4    Fe_H : 5    PLX : 4    PM : 6    MK : 14   

   

Observing logs


IUE : 36   

   

External archives :

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

Data at NED - NASA/IPAC Extragalactic Database : * o Vir

Link by name to the catalogue in VizieR :

AG+03 1726 BD+04 2764 FK5 1351 GSC 00310-01430 HD 118022
HIC 66200 HIP 66200 HR 5105 IRAS 13316+0354 2MASS J13340794+0339324
PLX 3098 PPM 159871 SAO 120004 TD1 16917 TYC 310-1430-1
uvby98 100118022 V* CW Vir Gaia DR2 3712858597278688000

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2023.06.03-17:51:10

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