2003A&A...405..223L


Query : 2003A&A...405..223L

2003A&A...405..223L - Astronomy and Astrophysics, volume 405, 223-226 (2003/7-1)

The magnetic field of the β Lyrae system: Orbital and longer time-scale variability.

LEONE F., PLACHINDA S.I., UMANA G., TRIGILIO C. and SKULSKY M.

Abstract (from CDS):

The presence of a magnetic field in βLyrae was firstly suggested by Babcock in 1958 and then confirmed by Skulsky in 1982. This kG-order large-scale organized magnetic field has been neglected in interpreting and modeling the large variety of phenomena presented by βLyrae. Here, we present circular spectropolarimetry of βLyrae showing that its magnetic field is variable with the orbital period and that it has changed in sign and strength between 1980 and 2000. Unfortunately, there are not enough data to conclude if a longer-time variability is super-imposed on the orbital period variability or if the field changes abruptly. This magnetic field, to our knowledge, is unique. Since we measured the magnetic field in metal lines of the brightest star of the system, we can conclude that this is the first magnetic B-type giant star. In this case, the magnetic field is significantly different from that of Magnetic Chemically Peculiar stars and the long-time-scale variability suggests the presence of a dynamo. However, we cannot rule out that the magnetic field measured on the brightest star is generated by the accretion disk, or that the magnetic field of the embedded star is so elongated in the orbital plane by the disk that it still has a significant strength even at the companion distance. In any case, the accretion disk is certainly related to the magnetic field of the β Lyrae system. We found that variations of the field in sign and strength corresponded to variations in the disk structure, as it is inferred from photometry and spectroscopy. Also, a magnetized disk explains the observed jet-like outflow from the β Lyrae system.

Abstract Copyright:

Journal keyword(s): stars: individual: HD 174638 - stars: magnetic fields - stars: binaries: spectroscopic - stars: binaries: eclipsing - stars: chemically peculiar

Simbad objects: 1

goto Full paper

goto View the reference in ADS

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 - 2021
#notes
1 * bet Lyr EB* 18 50 04.7952472 +33 21 45.609978 2.85 3.42 3.42 3.31 3.29 B8.5Ib-II 897 0

    Equat.    Gal    SGal    Ecl

Query : 2003A&A...405..223L

Basic data :
* bet Lyr -- Eclipsing binary
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:
* (*,AG,...), ** (**,ADS,...), IR (IRAS,IRC,...), V* (V*,AAVSO), X (2E,1RXS), SB* (SBC7,SBC9), bL* (2003AstL), EB* (2009AJ), Em* (EM*), Rad (RORF), UV (CEL)
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) :
18 50 04.7952472 +33 21 45.609978 (Optical) [ 0.12 0.15 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) :
18 48 13.9404172 +33 18 12.460322 [ 0.12 0.15 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) :
063.1876119048 +14.7834605414 [ 0.12 0.15 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 :
1.90 -3.53 [0.12 0.20 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) 2.20 [0.7] / z(~) 0.000007 [0.000002] / cz 2.20 [0.70]
   A 2004A&A...424..727P
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):
3.39 [0.17] 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:
B8.5Ib-II C 1986ApJ...304..688A
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 (8) :
U 2.85 [~] C 2002yCat.2237....0D
B 3.42 [~] C 2002yCat.2237....0D
V 3.42 [~] C 2002yCat.2237....0D
R 3.31 [~] C 2002yCat.2237....0D
I 3.29 [~] C 2002yCat.2237....0D
J 3.35 [~] C 2002yCat.2237....0D
H 3.31 [~] C 2002yCat.2237....0D
K 3.11 [~] C 2002yCat.2237....0D
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
Back
All CDSPortal (CDSPortal)

Send to sendBySAMP sendBySAMP

sedIcon
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 (55) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

* bet Lyr EM* MWC 306 2MASS J18500479+3321455 SBC9 1092
* 10 Lyr FK5 705 N30 4183 SKY# 34642
** STF 4039A GC 25847 NAME Sheliak SRS 30705
** BU 293A GCRV 11294 PLX 4353 TIC 28569279
** RBR 11 GEN# +1.00174638A PMC 90-93 500 TYC 2642-2929-1
ADS 11745 A GSC 02642-02929 PMSC 18464+3314Aab UBV 21442
AG+33 1690 HD 174638 PPM 81887 UBV M 23269
ALS 19761 HIC 92420 RAFGL 5305S V* bet Lyr
BD+33 3223 HIP 92420 Renson 48890 WDS J18501+3322Aa,Ab
CCDM J18501+3322A HR 7106 RORF 1848+333 WDS J18501+3322A
CEL 4657 IDS 18464+3315 A 1RXS J185006.6+332123 WEB 15967
CSI+33 3223 1 IRAS 18482+3318 SAO 67452 [HFE83] 1239
2E 4146 IRC +30343 SAO 67451 AAVSO 1846+33
2E 1848.2+3318 JP11 3029 SBC7 710

References (897 between 1850 and 2021) (Total 897)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
Follow new references on this object
                Reference summaries :

                from: to:

                 or select by : (not exhaustive, explanation here)


Collections of Measurements


velocities : 18    V* : 1    ROT : 1    Fe_H : 3    PLX : 2    PM : 5    MK : 5   

   

Observing logs


ISO : 3    IUE : 156   

   


External archives :

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

Data at NED - NASA/IPAC Extragalactic Database : * bet Lyr

Link by name to the catalogue in VizieR :

AG+33 1690 ALS 19761 BD+33 3223 CCDM J18501+3322A CEL 4657
2E 4146 FK5 705 GSC 02642-02929 HD 174638 HIC 92420
HIP 92420 HR 7106 IRAS 18482+3318 IRC +30343 2MASS J18500479+3321455
PLX 4353 PPM 81887 RAFGL 5305S 1RXS J185006.6+332123 SAO 67452
SAO 67451 TYC 2642-2929-1 V* bet Lyr WDS J18501+3322Aa,Ab WDS J18501+3322A

Search by coordinates in Vizier (radius: 5 arcsec)


Annotations :
Annotations allow a user to add a note or report an error concerning the astronomical object and its data. It requires registration to post a note. See description .
Please, have a look at Best practices. The list of all annotations to SIMBAD objects can be found here .

Currently no annotations available

add an annotation to this object

report an error concerning the data of this object


To bookmark this query, right click on this link: simbad:objects in 2003A&A...405..223L and select 'bookmark this link' or equivalent in the popup menu


2021.07.24-12:45:21

© Université de Strasbourg/CNRS

    • Contact