2002A&A...382..124S


C.D.S. - SIMBAD4 rel 1.7 - 2020.02.29CET12:01:29

2002A&A...382..124S - Astronomy and Astrophysics, volume 382, 124-129 (2002/1-4)

Implications of the HST/FGS parallax of SS Cygni on the disc instability model.

SCHREIBER M.R. and GAENSICKE B.T.

Abstract (from CDS):

We analyse the consequences of the recently measured parallax of SS Cygni (Harrison et al., 1999ApJ...515L..93H) on the accretion disc limit cycle model. Using the observed long term light curve of SS Cyg and d=166±12pc, we obtain for the mean mass transfer rate <{dot}(M)>tr=4.2±1.7x1017g/s. In addition, we calculate the vertical structure of the accretion disc taking into account heating of the outer disc by the stream impact. Comparing the mean accretion rate derived from the observations with the calculated critical mass transfer rate, we find that the disc instability model disagrees with the observed long term light curve of SS Cyg as <{dot}(M)>tr is greater or similar to the critical mass transfer rate. The failure of the model indicated by this result can be confirmed by considering that the accretion rate at the onset of the decline should be exactly equal to the value critical for stability. In contrast to this prediction of the model, we find that the accretion rate required to explain the observed visual magnitude at the onset of the decline must be significantly higher than the critical mass transfer rate. Our results strongly suggest that either the usually assumed temperature dependence of the viscosity parameter α is not a realistic description of the disc viscosity, that the mass transfer rate in SS Cyg noticeably increases during the outbursts or, finally, that the HST distance of 166±12pc, is too high.

Abstract Copyright:

Journal keyword(s): accretion, accretion discs - binaries: close - stars: individual: SS Cygni - novae, cataclysmic variables

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 - 2020
#notes
1 V* SS Cyg DN* 21 42 42.8034554117 +43 35 09.863763484 11.07 8.2 7.70     K5V 1204 1

    Equat.    Gal    SGal    Ecl

C.D.S. - SIMBAD4 rel 1.7 - 2020.02.29CET12:01:29

Available data : Basic data  •  Identifiers  •  Plot & images  •  Bibliography  •  Measurements  •  External archives  •  Notes  •  Annotations


Basic data :
V* SS Cyg -- Dwarf Nova
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:
DN* (), * (HD,ALS,...), X (3A,1E,...), UV (Ref,2EUVE,...), SB* (SBC7,SBC9), Em* (EM*,[KW97]), PM* (Ref,PM), V* (V*,AAVSO), gam (INTEGRAL1), CV* (Ref), IR (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) :
21 42 42.8034554117 +43 35 09.863763484 (Optical) [ 0.0395 0.0449 90 ] A 2018yCat.1345....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) :
21 40 44.4442377289 +43 21 23.021433984 [ 0.0395 0.0449 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) :
090.5591599307520 -07.1105905629115 [ 0.0395 0.0449 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 :
112.373 33.589 [0.113 0.094 90] A 2018yCat.1345....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) -62.0 [10] / z(~) -0.000207 [0.000033] / cz -61.99 [10.00]
   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):
8.7242 [0.0491] A 2018yCat.1345....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:
K5V C 2002MNRAS.337.1215N
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 (7) :
U 11.07 [~] D 2003AJ....125.2531R
B 8.2 [~] E ~
V 7.70 [~] C 2002yCat.2237....0D
G 11.6889 [0.0137] C 2018yCat.1345....0G
J 10.03 [~] C 2002yCat.2237....0D
H 9.63 [~] C 2002yCat.2237....0D
K 9.39 [~] C 2002yCat.2237....0D
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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!).
Some important notes on this object about identifications and objects associations.
notes:


The link on the acronym of the identifiers give access to the information for this acronym in the dictionary of nomenclature.
Identifiers (45) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

HD 206697 GEN# +1.00206697 RE J214241+433511 WEB 19362
3A 2140+433 1H 2140+433 1RXS J214242.6+433506 [BM83] X2140+433
ALS 11959 INTEGRAL1 121 SBC7 872 [FS2003] 1134
BD+42 4189a KPD 2140+4321 SBC9 1326 [KRL2007b] 389
CSI+42 4189 1 LS III +43 24 SV* HV 84 [KW97] 59-12
1E 2140.7+4321 2MASS J21424280+4335098 SWIFT J2142.7+4337 [SPB96] 2200
2E 4511 PBC J2142.7+4334 SWIFT J2142.6+4334 AAVSO 2138+43
2E 2140.7+4321 PLX 5240 TYC 3196-723-1 Gaia DR1 1972957892448494592
EM* CDS 1268 PLX 5240.00 UBV M 50941 Gaia DR2 1972957892448494592
2EUVE J2142+43.6 PM J21427+4335 UCAC2 46852538
EUVE J2142+43.6 2RE J2142+433 USNO 568
GCRV 13641 RE J2142+433 V* SS Cyg

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References (1204 between 1850 and 2020) (Total 1204)
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


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

   

Observing logs


XMM : 2    herschel : 2    IUE : 14   

   


External archives :

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

Data at NED - NASA/IPAC Extragalactic Database : V* SS Cyg

Link by name to the catalogue in VizieR :

HD 206697 ALS 11959 BD+42 4189a 2E 4511 EUVE J2142+43.6
LS III +43 24 2MASS J21424280+4335098 PLX 5240 2RE J2142+433 1RXS J214242.6+433506
TYC 3196-723-1 UCAC2 46852538 V* SS Cyg Gaia DR1 1972957892448494592 Gaia DR2 1972957892448494592

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2020.02.29-12:01:29

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