2016A&A...585A.123M


C.D.S. - SIMBAD4 rel 1.7 - 2020.02.17CET13:59:51

2016A&A...585A.123M - Astronomy and Astrophysics, volume 585A, 123-123 (2016/1-1)

Origin of the long-term modulation of radio emission of LS I +61°303.

MASSI M. and TORRICELLI-CIAMPONI G.

Abstract (from CDS):

One of the most unusual aspects of the X-ray binary LS I +61°303 is that at each orbit (P1=26.4960±0.0028d) one radio outburst occurs whose amplitude is modulated with Plong, a long-term period of more than 4yr. It is still not clear whether the compact object of the system or the companion Be star is responsible for the long-term modulation. We study here the stability of Plong. Such a stability is expected if Plong is due to periodic (P2) Doppler boosting of periodic (P1) ejections from the accreting compact object of the system. On the contrary it is not expected if Plong is related to variations in the mass loss of the companion Be star. We built a database of 36.8yr of radio observations of LS I +61°303 covering more than 8 long-term cycles. We performed timing and correlation analysis. We also compared the results of the analyses with the theoretical predictions for a synchrotron emitting precessing (P2) jet periodically (P1) refilled with relativistic electrons. In addition to the two dominant features at P1 and P2, the timing analysis gives a feature at Plong=1628 ±48 days. The determined value of Plong agrees with the beat of the two dominant features, i.e. Pbeat=1/(ν12)=1626±68d. Lomb-Scargle results of radio data and model data compare very well. The correlation coefficient of the radio data oscillates at multiples of Pbeat, as does the correlation coefficient of the model data. Cycles in varying Be stars change in length and disappear after 2-3 cycles following the well-studied case of the binary system ζ Tau. On the contrary, in LS I +61°303 the long-term period is quite stable and repeats itself over the available 8 cycles. The long-term modulation in LS I +61°303 accurately reflects the beat of periodical Doppler boosting (induced by precession) with the periodicity of the ejecta. The peak of the long-term modulation occurs at the coincidence of the maximum number of ejected particles with the maximum Doppler boosting of their emission; this coincidence occurs every (1)/(ν12) and creates the long-term modulation observed in LS I +61°303.

Abstract Copyright:

Journal keyword(s): stars: emission-line, Be - gamma rays: stars - X-rays: individuals: LS I +61 303 - radio continuum: stars - stars: jets - X-rays: binaries

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 LS I +61 303 HXB 02 40 31.6641883136 +61 13 45.591138110 11.27 11.61 10.75 10.19 9.55 B0Ve 754 2

    Equat.    Gal    SGal    Ecl

C.D.S. - SIMBAD4 rel 1.7 - 2020.02.17CET13:59:51

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


Basic data :
LS I +61 303 -- High Mass X-ray 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:
gam (1AGL,1AGLR,...), X (Ref,1E,...), * (HIP,ALS,...), Rad (BWE,GT,...), Em* (EM*,HBHA,...), V* (V*,AAVSO), HXB (Ref), *iC ([VGK85]), 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) :
02 40 31.6641883136 +61 13 45.591138110 (Optical) [ 0.0285 0.0300 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) :
02 36 40.6209752983 +61 00 54.151273472 [ 0.0285 0.0300 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) :
135.6752748739358 +01.0861260688011 [ 0.0285 0.0300 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 :
-0.296 -0.079 [0.041 0.067 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) -41.41 [~] / z(~) -0.000138 [~] / cz -41.41 [~]
   D 2009ApJ...698..514A
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):
0.3801 [0.0380] 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:
B0Ve D ~
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 (9) :
U 11.27 [~] D 2003AJ....125.2531R
B 11.61 [~] D 2015A&A...574A..33R
V 10.75 [~] D 2015A&A...574A..33R
R 10.19 [~] D 2015A&A...574A..33R
G 10.3933 [0.0011] C 2018yCat.1345....0G
I 9.55 [~] D 2015A&A...574A..33R
J 8.621 [0.024] C 2003yCat.2246....0C
H 8.228 [0.021] C 2003yCat.2246....0C
K 7.917 [0.023] 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!).
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 (67) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

HIP 12469 1FGL J0240.5+6116 IGR J02403+6113 UBV M 50704
1AGL J0242+6111 1FGL J0240.5+6113 INTREF 123 V* V615 Cas
1AGLR J0240+6115 2FGL J0240.5+6113 INTREF 125 VER J0240+612
ALS 7373 3FGL J0240.5+6113 LS I +61 303 WN B0236.6+6100
BWE 0236+6101 4FGL J0240.5+6113 LS I +63 303 2XMM J024031.6+611345
1CG 135+01 1FHL J0240.2+6113 MAGIC J0240+613 [BM83] X0236+610
2CG 135+01 2FHL J0240.5+6113 2MASS J02403165+6113456 [BSF97] J024031.66+611345.6
CSI+61-02367 3FHL J0240.5+6113 NAME LS I +63 303 [CS2018] W4-I19
1E 0236.6+6100 GEN# +8.01610303 NVSS J024031+611345 [KW97] 13-1
2E 627 GEN# +6.20055754 PBC J0240.6+6114 [MPP98] 3
2E 0236.6+6101 GeV J0241+6102 RGB J0240+612 [TSA98] J024031.33+611342.71
2EG J0241+6119 GRO J0240+61 RX J0240.4+6112 [VGK85] IC 1805 +61 182
3EG J0241+6103 GRO J0241+61 1RXS J024033.5+611358 AAVSO 0234+61
EGR J0240+6112 GSC 04047-01917 SWIFT J0240.5+6118 AAVSO 0232+60
EM* VES 754 GT 0236+610 SWIFT J0240.9+6115 Gaia DR1 465645510826577280
1ES 0236+61.0 HBHA 6212-42 TeV J0240+612 Gaia DR2 465645515129855872
0FGL J0240.3+6113 HIC 12469 TYC 4047-1917-1

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References (754 between 1850 and 2020) (Total 754)
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 : 1    PM : 3    PLX : 3    MK : 1   

   

Observing logs


XMM : 6    IUE : 17   

   


External archives :

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

Data at NED - NASA/IPAC Extragalactic Database : LS I +61 303

Link by name to the catalogue in VizieR :

HIP 12469 ALS 7373 BWE 0236+6101 2E 627 3EG J0241+6103
GSC 04047-01917 HIC 12469 LS I +61 303 LS I +63 303 2MASS J02403165+6113456
NVSS J024031+611345 1RXS J024033.5+611358 TYC 4047-1917-1 V* V615 Cas WN B0236.6+6100
Gaia DR1 465645510826577280 Gaia DR2 465645515129855872

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2020.02.17-13:59:51

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