2017MNRAS.472...55P

Query : 2017MNRAS.472...55P

2017MNRAS.472...55P - Mon. Not. R. Astron. Soc., 472, 55-66 (2017/November-3)

Candidate magnetic dust structures for star light polarization.

PAPOULAR R.

Abstract (from CDS):

Rotation damping and alignment are discussed as prerequisites for polarization. An expression is derived from first principles, for the damping time of the rotation of a particle in a magnetic field, under the Faraday braking torque, provided its electrical properties are known. This makes it possible to describe mathematically, in great detail, the motion of the particle and determine its ultimate state of motion, if a steady state is possible at all. This work defines, first, the necessary condition for the Faraday braking to be effective: (a) the net electronic charge distribution should not be uniform throughout and (b) the number of vibration modes should exceed a few tens. Resonance of rotation frequency with any of these modes is not a requirement. For alignment to be possible, the ratio of gyroscopic and conservative magnetic to non-conservative (retarding) magnetic torques must be low. Either dia-, para- or ferromagnetism can do, and a small susceptibility is enough and even preferable. This opens up a wide spectrum of possible candidates. A few examples are given.

Abstract Copyright: © 2017 The Author Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): astrochemistry - ISM: dust, extinction - ISM: lines and bands - ISM: magnetic fields - ISM: molecules

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 - 2026 		#notes
1 Ass Cyg OB 2 As* 20 33.2 +41 19           ~ 1023 0

Query : 2017MNRAS.472...55P

Basic data :
Ass Cyg OB 2 -- Association of Stars
Other object types: otypes_help 		Cl* ([KPR2004b],[KPS2012],...), As* (2013A&A,Ass), X (1E)
ICRS coord. (ep=J2000) : 		20 33 12.0 +41 19 00 [ ] E 2005A&A...438.1163K
FK4 coord. (ep=B1950 eq=1950) : 		20 31 24.3 +41 08 42 [ ]
Gal coord. (ep=J2000) : 		080.2204 +00.7966 [ ]
Proper motions mas/yr : 		-1.60 -4.72 [0.26 0.24 90] D 2005A&A...438.1163K
Radial velocity / Redshift / cz : 		V(km/s) -28.00 [~] / z(~) -0.000093 [~] / cz -28.00 [~]
   D 2005A&A...438.1163K
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Hierarchy : number of linked objects
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: 3336 		Display criteria :

Identifiers (7) :
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NAME VI Cyg 1E 2031.0+4050 [KPR2004b] 490 [MWC53] VI Cyg
Ass Cyg OB 2 NAME VI Cygni [KPS2012] MWSC 3364

References (1023 between 1850 and 2026) (Total 1023)
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 Description of Measurements

Velocities : 1    Distance : 4   

   

Observing logs
Herschel : 4    XMM : 4   

   

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