2000A&A...362..281T


Query : 2000A&A...362..281T

2000A&A...362..281T - Astronomy and Astrophysics, volume 362, 281-288 (2000/10-1)

Coherent radio emission from the magnetic chemically peculiar star CU Virginis.

TRIGILIO C., LETO P., LEONE F., UMANA G. and BUEMI C.

Abstract (from CDS):

Radio observations of the magnetic chemically peculiar star CU Vir, carried out with the VLA in three different days, show that the radio emission at 20 cm is characterized by a strong enhancement at particular rotational phases. This radio emission is found to be right hand polarized with a degree of polarization close to 100%. As common for this class of stars, the magnetic axis of CU Vir is oblique with respect to the rotational axis. By comparing the 20 cm radio light curve with the effective magnetic field available from the literature, a coincidence of the main peaks of the radio emission with the magnetic nulls has been found. This happens when the magnetic axis lies in the plane of the sky. We suggest that the high degree of polarization, together with the high directivity of the radiation, can be explained in terms of coherent radio emission. The data have been interpreted on the basis of the Electron Cyclotron Maser Emission from electrons accelerated in current sheets out of the Alfven radius toward the stellar surface and eventually reflected outward by magnetic mirroring.

Abstract Copyright:

Journal keyword(s): polarization - masers - stars: chemically peculiar - stars: individual: CU Vir - stars: magnetic fields - radio continuum: stars

Simbad objects: 9

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Number of rows : 9
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 HD 21699 Ro* 03 32 08.6084197968 +48 01 24.528548676 4.81 5.355 5.461     B9III 200 0
2 V* HZ Aur a2* 05 06 08.3584818960 +33 55 07.279039380   7.03 7.07     B9p 179 0
3 V* V1046 Ori SB* 05 35 21.8667428568 -04 29 39.024375324 5.66 6.43 6.56 6.61 6.74 B2/3V 289 0
4 * sig Ori E Y*O 05 38 47.2050040320 -02 35 40.521424812 5.66 6.38 6.46 6.84 7.08 B2IV-Vp_He 424 0
5 V* U Vir Mi* 12 51 05.7376280088 +05 33 11.548496016   10.87 7.40     M2-8:e 73 0
6 3C 286 Sy1 13 31 08.2883506368 +30 30 32.960091564   17.51 17.25     ~ 4059 2
7 V* CU Vir a2* 14 12 15.8054758 +02 24 33.953395 4.46 4.90 5.02 5.10 5.23 ApSi 371 0
8 V* HR Lup a2* 15 08 12.1238757000 -40 35 02.155417224 5.25 5.65 5.79     B8IVSi 161 1
9 V* V686 CrA a2* 18 56 40.4859327624 -37 20 35.701261512 4.53 5.24 5.38     B3V 199 0

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2022.05.20-18:35:50

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