2011A&A...526A..44L


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.13CEST07:32:42

2011A&A...526A..44L - Astronomy and Astrophysics, volume 526A, 44-44 (2011/2-1)

Doppler images of the RS CVn binary II Pegasi during the years 1994-2002.

LINDBORG M., KORPI M.J., HACKMAN T., TUOMINEN I., ILYIN I. and PISKUNOV N.

Abstract (from CDS):

We publish 16 Doppler imaging temperature maps for the years 1994-2002 of the active RS CVn star II Peg. The six maps from 1999-2002 are based on previously unpublished observations. Through Doppler imaging we want to study the spot evolution of the star and in particular compare this with previous results showing a cyclic spot behaviour and persistent, active longitudes. The observations were collected with the SOFIN spectrograph at the Nordic Optical Telescope. The temperature maps were calculated using a Doppler imaging code based on Tikhonov regularization. During 1994-2001, our results show a consistent trend in the derived longitudes of the principal and secondary temperature minima over time such that the magnetic structure appears to rotate somewhat more rapidly than the orbital period of this close binary. A sudden phase jump in the active region occurred between the observing seasons of 2001 and 2002. No clear trend over time is detected in the derived latitudes of the spots, indicating that the systematic motion could be related to the drift of the spot-generating mechanism rather than to differential rotation. The derived temperature maps are quite similar to the ones obtained earlier with different methods and the main differences occur in the spot latitudes and relative strength of the spot structures. We observe both longitude and latitude shifts in the spot activity of II Peg. However, our results are not consistent with the periodic behaviour presented in previous studies.

Abstract Copyright:

Journal keyword(s): stars: individual: HD 224085 - stars: activity - stars: imaging - starspots

VizieR on-line data: <Available at CDS (J/A+A/526/A44): table1.dat>

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 HD 224085 RS* 23 55 04.0516465022 +28 38 01.248194500 8.88 8.20   6.9   K2+IVeFe-1 680 0

    Equat.    Gal    SGal    Ecl

C.D.S. - SIMBAD4 rel 1.7 - 2020.07.13CEST07:32:42

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


Basic data :
HD 224085 -- Variable of RS CVn type
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:
RS* (), * (HD,AG,...), X (1A,3A,...), PM* (Ref,2016ApJS..224...36K,...), SB* (CABS,CCABS,...), IR (IRAS,2MASS,...), UV (2EUVE,EUVE,...), Ae* (Ref), V* (V*)
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) :
23 55 04.0516465022 +28 38 01.248194500 (Optical) [ 0.0245 0.0213 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) :
23 52 29.0886862680 +28 21 17.778437208 [ 0.0245 0.0213 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) :
108.2326595755176 -32.6239638905320 [ 0.0245 0.0213 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 :
575.150 34.245 [0.044 0.034 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) -20.50 [0.1] / z(~) -0.000068 [0.000000] / cz -20.50 [0.10]
   A 2004MNRAS.349.1069K
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):
25.4046 [0.0393] 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:
K2+IVeFe-1 C 1989ApJS...71..245K
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 8.88 [~] C 2002yCat.2237....0D
B 8.20 [~] C 2002yCat.2237....0D
R 6.9 [~] E 2003AJ....125..984M
G 7.0988 [0.0042] C 2018yCat.1345....0G
J 5.485 [0.029] C 2003yCat.2246....0C
H 4.952 [0.029] C 2003yCat.2246....0C
K 4.724 [0.027] C 2003yCat.2246....0C
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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!).

The link on the acronym of the identifiers give access to the information for this acronym in the dictionary of nomenclature.
Identifiers (66) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

HD 224085 GC 33168 PM 23525+2821 UBV 20529
1A 0000+28 GCRV 14960 PPM 115949 USNO-B1.0 1186-00604211
3A 2355+284 GEN# +1.00224085 RBS 2059 uvby98 100224085
AG+28 2842 G 130-24 2RE J235503+283806 V* II Peg
ASCC 738952 GJ 4375 2RE J2355+283 WEB 20737
AT 2355+284 HIC 117915 RE J235503+283803 WISEA J235504.49+283801.5
1AXG J235504+2837 HIP 117915 RE J2355+283 WISE J235504.53+283801.5
BD+27 4642 IRAS 23525+2821 RE J235503+283806 1XRS 00000+278
CABS 206 LAL 46867 RX J2355.0+2838 XSS J23556+2848
CCABS 168 LFT 1838 RX J2355.0+2837 YZC 24 14346
Ci 20 1461 LHS 4044 1RXS J235503.5+283802 YZ 28 14346
Ci 19 3131 LSPM J2355+2838 SAO 91578 [BM83] X2352+283
2E 4789 LTT 17045 SBC7 971 [ZEH2003] RX J2355.0+2838 1
2E 2352.5+2821 2MASS J23550404+2838010 SBC9 1462 Gaia DR2 2855095251072482432
1ES 2352+28.3 NLTT 58392 SKY# 45126 Gaia DR1 2855095246776191744
2EUVE J2355+28.6 PLX 5777 TYC 2258-1427-1
EUVE J2355+28.6 PLX 5777.00 UBV M 27327

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References (680 between 1850 and 2020) (Total 680)
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 : 1    diameter : 1    velocities : 7    PM : 11    PLX : 5    MK : 10   

   

Observing logs


ISO : 3    herschel : 3    IUE : 167   

   


External archives :

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

Data at NED - NASA/IPAC Extragalactic Database : HD 224085

Link by name to the catalogue in VizieR :

HD 224085 AG+28 2842 BD+27 4642 CABS 206 2E 4789
EUVE J2355+28.6 G 130-24 GJ 4375 HIC 117915 HIP 117915
IRAS 23525+2821 LHS 4044 LSPM J2355+2838 2MASS J23550404+2838010 NLTT 58392
PLX 5777 PPM 115949 2RE J235503+283806 2RE J2355+283 1RXS J235503.5+283802
SAO 91578 TYC 2258-1427-1 USNO-B1.0 1186-00604211 uvby98 100224085 V* II Peg
WISEA J235504.49+283801.5 WISE J235504.53+283801.5 YZC 24 14346 Gaia DR2 2855095251072482432 Gaia DR1 2855095246776191744

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2020.07.13-07:32:42

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