2001A&A...376..217M


Query : 2001A&A...376..217M

2001A&A...376..217M - Astronomy and Astrophysics, volume 376, 217-223 (2001/9-2)

One-sided jet at milliarcsecond scales in LS I +61 303.

MASSI M., RIBO M., PAREDES J.M., PERACAULA M. and ESTALELLA R.

Abstract (from CDS):

We present Very Long Baseline Interferometry (VLBI) observations of the high mass X-ray binary LS I +61 303, carried out with the European VLBI Network (EVN). Over the 11 hour observing run, performed ∼10 days after a radio outburst, the radio source showed a constant flux density, which allowed sensitive imaging of the emission distribution. The structure in the map shows a clear extension to the southeast. Comparing our data with previous VLBI observations we interpret the extension as a collimated radio jet as found in several other X-ray binaries. Assuming that the structure is the result of an expansion that started at the onset of the outburst, we derive an apparent expansion velocity of 0.003c, which, in the context of Doppler boosting, corresponds to an intrinsic velocity of at least 0.4c for an ejection close to the line of sight. From the apparent velocity in all available epochs we are able to establish variations in the ejection angle which imply a precessing accretion disk. Finally we point out that LS I +61 303, like SS 433 and Cygnus X-1, shows evidence for an emission region almost orthogonal to the relativistic jet.

Abstract Copyright:

Journal keyword(s): stars: individual: LS I +61 303 - radio continuum: stars - X-rays: stars - stars: emission-line, Be - stars: variables: general

Simbad objects: 7

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Number of rows : 7
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 LS I +61 303 HXB 02 40 31.6644419688 +61 13 45.593918580 11.27 11.61 10.75 10.19 9.55 B0Ve 806 2
2 V* V1033 Sco HXB 16 54 00.137 -39 50 44.90   15.20 14.2 16.14   F5IV 1793 1
3 V* V479 Sct HXB 18 26 15.0561548880 -14 50 54.247274304 12.02 12.23 11.27 11.04   ON6V((f))z 535 2
4 SS 433 HXB 19 11 49.5647697480 +04 58 57.827127648   16.3 13.0     A7Ib: 2028 4
5 Granat 1915+105 HXB 19 15 11.55576 +10 56 44.9052           ~ 2454 0
6 HD 226868 HXB 19 58 21.6757355952 +35 12 05.784512688 9.38 9.72 8.91 8.42   O9.7Iabpvar 4123 0
7 V* V1521 Cyg HXB 20 32 25.78 +40 57 27.9           WN4/5-6/7 1869 2

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2022.08.18-00:29:13

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