CDS

2009A&A...507.1531S

Query : 2009A&A...507.1531S

2009A&A...507.1531S - Astronomy and Astrophysics, volume 507, 1531-1539 (2009/12-1)

The origin of the supersoft X-ray-optical/UV flux anticorrelation in the symbiotic binary AG Draconis.

SKOPAL A., SEKERAS M., GONZALEZ-RIESTRA R. and VIOTTI R.F.

Abstract (from CDS):

AG Draconis produces a strong supersoft X-ray emission. The X-ray and optical/UV fluxes are in strict anticorrelation throughout the active and quiescent phases. We identify the source of the X-ray emission and reveal the nature of the observed flux anticorrelation. We used X-ray and UV observations with XMM-Newton, far-UV spectroscopy from FUSE, low- and high-resolution IUE spectra, and optical/near-IR spectroscopic and/or photometric observations. We modeled the spectral energy distribution and broad wings of the OVI λ1032, λ1038 and HeIIλ1640 lines by the electron-scattering during the maximum of the 2003 burst, and the subsequent transition and quiescent phase. The X-ray-near-IR energy distribution at different levels of the star's brightness confirmed the observed flux anticorrelation quantitatively and showed that the optical bursts are associated to an increase in the nebular component of radiation. The profile-fitting analysis revealed a significant increase in the mean particle density around the hot star from ∼2.6x1010cm–3 during quiescent phase to ∼1.1x1012cm–3 during the burst. The supersoft X-ray emission is produced by the white dwarf photosphere. The X-ray and far-UV fluxes make it possible to determine its temperature unambiguously. The supersoft X-ray-optical/UV flux anticorrelation is caused by the variable wind from the hot star. The enhanced hot star wind gives rise to the optical bursts by reprocessing high-energy photons from the Lyman continuum to the optical/UV.

Abstract Copyright: ∼

Journal keyword(s): stars: binaries: symbiotic - stars: fundamental parameters - X-rays: binaries - X-rays: individual: AG Draconis

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 - 2024 		#notes
1 V* AG Dra Sy* 16 01 41.0120557968 +66 48 10.135056672 11.50 11.06 9.74 8.52   K3IIIep 498 0

Query : 2009A&A...507.1531S

Basic data :
V* AG Dra -- Symbiotic Star
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: 		Sy* (), * (BD,AG,...), X (2E,1ES,...), V* (V*,AAVSO), UV (2012ApJS,2RE), RG* (2019ApJ), LP* (2022yCat), SB* (SBC9), C*? (2022yCat), Em* (EM*), Pe* (2020AJ), 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) : 		16 01 41.0120557968 +66 48 10.135056672 (Optical) [ 0.0148 0.0138 90 ] A 2020yCat.1350....0G
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) : 		16 01 23.2655536489 +66 56 25.530236123 [ 0.0148 0.0138 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) : 		100.2876824492777 +40.9712106525478 [ 0.0148 0.0138 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 : 		-6.934 -5.851 [0.019 0.020 90] A 2020yCat.1350....0G
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) -147.080994 [0.013585] / z(spectroscopic) -0.000490 [0.000000] / cz -147.04 [0.01]
   (NIR) A 2020AJ....160..120J
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): 		0.3411 [0.015] A 2020yCat.1350....0G
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: 		K3IIIep C 2011ARep...55...31S
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 11.50 [~] C 2002yCat.2237....0D
B 11.06 [~] C 2002yCat.2237....0D
V 9.74 [~] C 2002yCat.2237....0D
R 8.52 [~] C 2002yCat.2237....0D
G 9.172479 [0.003827] C 2020yCat.1350....0G
J 7.154 [0.023] C 2003yCat.2246....0C
H 6.365 [0.017] C 2003yCat.2246....0C
K 6.209 [0.016] 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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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 (37) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

BD+67 922 GSC 04195-00254 RX J1601.6+6648 [P2004] 22
AG+66 715 HIC 78512 1RXS J160141.2+664811 [TSA98] J160141.63+664802.73
AP J16014101+6648101 HIP 78512 SAO 16931 [ZEH2003] RX J1601.6+6648 1
BPS BS 16087-0012 IRAS 16013+6656 SBC9 884 AAVSO 1601+67
2E 3573 JP11 236 SV* SVS 1155 Gaia DR3 1642955252784454144
2E 1601.3+6656 2MASS J16014101+6648101 TIC 237100139 Gaia DR1 1642955248488167808
EM* CDS 889 PPM 19692 TYC 4195-254-1 Gaia DR2 1642955252784454144
1ES 1601+66.9 RBS 1547 UBV 13635
GCRV 9231 2RE J1601+664 V* AG Dra
GEN# +0.06700922 2RE J160133+664805 WEB 13272

References (498 between 1850 and 2024) (Total 498)
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 : 7    V* : 1    distance : 1    Fe_H : 3    PLX : 3    PM : 5    MK : 2   

   

Observing logs


ISO : 2    IUE : 169    XMM : 3   

   

External archives :

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

Data at NED - NASA/IPAC Extragalactic Database : V* AG Dra

Link by name to the catalogue in VizieR :

BD+67 922 AG+66 715 AP J16014101+6648101 2E 3573 GSC 04195-00254
HIC 78512 HIP 78512 IRAS 16013+6656 2MASS J16014101+6648101 PPM 19692
2RE J1601+664 2RE J160133+664805 1RXS J160141.2+664811 SAO 16931 TYC 4195-254-1
V* AG Dra Gaia DR3 1642955252784454144 Gaia DR1 1642955248488167808 Gaia DR2 1642955252784454144

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2023.11.29-19:51:19

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