CDS

2003A&A...403..155G

Query : 2003A&A...403..155G

2003A&A...403..155G - Astronomy and Astrophysics, volume 403, 155-171 (2003/5-3)

Tomography of a stellar X-ray corona: alpha Coronae Borealis.

GUEDEL M., ARZNER K., AUDARD M. and MEWE R.

Abstract (from CDS):

We interpret the X-ray light curve obtained by XMM-Newton during a total X-ray eclipse in the nearby binary star alpha Coronae Borealis. This system consists of a G5 V main-sequence star orbiting an X-ray dark A0 star. The secondary G star is a young, active solar analog with an age of a few 100Myr. As the primary A star eclipses active regions on the X-ray bright companion, the light curve drops in consecutive steps to zero; as individual active regions reappear during egress, the flux rises in similar steps. The ingress and egress light curves are combined to reconstruct the 2D distribution of X-ray brightness on and around the G star. Three different methods are applied, and variations due to statistical noise and uncertainties in the binary system parameters are discussed. Although the solutions are non-unique, all reconstructions reveal a similar distribution of X-ray bright regions and large areas with little flux. We present plausible estimates of (lower limits to) the electron densities in the bright regions, obtaining characteristic values between 109-3x1010cm–3.

Abstract Copyright: ∼

Journal keyword(s): stars: activity - stars: coronae - stars: individual: alpha CrB - X-rays: stars

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 * alf CrB EB* 15 34 41.26800 +26 42 52.8940 2.19 2.22 2.24 2.21 2.25 A1IV 475 0

Query : 2003A&A...403..155G

Basic data :
* alf CrB -- 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,...), SB* (SBC7,SBC9), EB* (2012MNRAS), X (RX,1RXS), UV (EUVE,TD1), IR (IRAS,IRC), PM* (LSPM), V* (V*), NIR (2MASS)
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) : 		15 34 41.26800 +26 42 52.8940 (Optical) [ 1.76 1.67 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) : 		15 32 34.14003 +26 52 54.7297 [ 1.76 1.67 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) : 		041.86974095 +53.77233188 [ 1.76 1.67 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 : 		120.27 -89.58 [0.19 0.20 0] 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) 1.7 [0.9] / z(~) 0.000006 [0.000003] / cz 1.70 [0.90]
   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): 		43.46 [0.28] 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: 		A1IV C 2003AJ....126.2048G
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 2.19 [~] C 2002yCat.2237....0D
B 2.22 [~] C 2002yCat.2237....0D
V 2.24 [~] C 2002yCat.2237....0D
R 2.21 [~] C 2002yCat.2237....0D
I 2.25 [~] C 2002yCat.2237....0D
J 2.25 [0.24] D 2003yCat.2246....0C
H 2.394 [0.202] D 2003yCat.2246....0C
K 2.206 [0.362] D 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 (50) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

* alf CrB GSC 02029-01690 PLX 3519 TIC 274945059
* 5 CrB HD 139006 PLX 3519.00 TYC 2029-1690-1
* alf CrB A HGAM 637 PMC 90-93 410 UBV 21417
* alf CrB B HIC 76267 PPM 104146 UBV M 20847
AG+26 1496 HIP 76267 ROT 2204 USNO-B1.0 1167-00260913
ASCC 690485 HR 5793 RX J1534.6+2642 uvby98 100139006
BD+27 2512 IRAS 15325+2652 1RXS J153441.5+264252 V* alf CrB
EUVE J1534+26.7 IRC +30275 SAO 83893 WEB 12948
FK5 578 JP11 2622 SBC7 545 [HFE83] 1115
GC 20947 LSPM J1534+2642 SBC9 850 [ZEH2003] RX J1534.6+2642 1
GCRV 8990 2MASS J15344125+2642529 SKY# 28165 Gaia DR3 1222646935698492160
GEN# +1.00139006 N30 3502 SRS 30578
GJ 9524 NAME Alphecca TD1 18384

References (475 between 1850 and 2023) (Total 475)
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 : 12    V* : 4    diameter : 1    ROT : 7    Fe_H : 5    PLX : 3    PM : 6    MK : 31   

   

Observing logs


herschel : 4    ISO : 6    IUE : 14    XMM : 1   

   

External archives :

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

Data at NED - NASA/IPAC Extragalactic Database : * alf CrB

Link by name to the catalogue in VizieR :

AG+26 1496 BD+27 2512 EUVE J1534+26.7 FK5 578 GJ 9524
GSC 02029-01690 HD 139006 HIC 76267 HIP 76267 HR 5793
IRAS 15325+2652 IRC +30275 LSPM J1534+2642 2MASS J15344125+2642529 PLX 3519
PPM 104146 1RXS J153441.5+264252 SAO 83893 TD1 18384 TYC 2029-1690-1
USNO-B1.0 1167-00260913 uvby98 100139006 V* alf CrB Gaia DR3 1222646935698492160

Search by coordinates in Vizier (radius: 5 arcsec)

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2023.03.27-10:09:20

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