2016MNRAS.458.1733A

Query : 2016MNRAS.458.1733A

2016MNRAS.458.1733A - Mon. Not. R. Astron. Soc., 458, 1733-1741 (2016/May-2)

Temporal decorrelation of optical turbulence as a function of altitude in the atmosphere.

AVILES J.L., AVILA R., CARRASCO E., SANCHEZ L.J., CHUN M., BUTTERLEY T., WILSON R. and URBIOLA F.J.

Abstract (from CDS):

Here, we propose a new method to evaluate the Taylor's frozen-flow hypothesis with the Generalized SCIntillation Detection And Ranging technique (G-SCIDAR). Unlike the work previously reported in the literature, we take into consideration the wind-speed fluctuation effects when examining the spatiotemporal cross-covariance functions computed according to the G-SCIDAR method. We show that under the assumption of having turbulent layers driven by fluctuating wind-velocity vectors, it is correct examining the encircled volume of smeared cross-covariance peaks. The method was used to process 60 spatiotemporal cross-covariance functions of the stellar scintillation patterns retrieved at the 2.2 m telescope of the University of Hawaii along a two hours observation run. We found that most of the time the structure of atmospheric refraction-index inhomogeneities decorrelates linearly with time for individual turbulent layers. Moreover, contrary to the behaviour expected under the assumption of having a slowly evolving structure of turbulent eddies, being translated by a much greater wind-velocity vector, which should strengthen the hypothesis of a frozen flow, we found that the temporal decorrelation of such structure increases as the overall layer displacement velocity increases.

Abstract Copyright: © 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): turbulence - atmospheric effects - instrumentation: high angular resolution - techniques: image processing

CDS comments: © 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

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 * gam Ari a2* 01 53 31.81479 +19 17 37.8790           kA0hA3(IV)SiSr+B9.5IV 63 0

Query : 2016MNRAS.458.1733A

Basic data :
* gam Ari -- alpha2 CVn Variable
Other object types: otypes_help 		* (*,BD,...), ** (**,ADS,...), a2* (2003AstL), V* (V*), UV (CEL), NIR (2MASS), IR (IRAS)
ICRS coord. (ep=J2000) : 		01 53 31.81479 +19 17 37.8790 (Optical) [ 11.50 6.33 90 ] A 2007A&A...474..653V
FK4 coord. (ep=B1950 eq=1950) : 		01 50 46.86287 +19 02 58.2097 [ 11.50 6.33 90 ]
Gal coord. (ep=J2000) : 		142.54807357 -41.20072874 [ 11.50 6.33 90 ]
Proper motions mas/yr : 		79.20 -97.63 [1.31 0.72 0] A 2007A&A...474..653V
Radial velocity / Redshift / cz : 		V(km/s) -0.60 [1.78] / z(~) -0.000002 [0.000006] / cz -0.60 [1.78]
   B 2007AN....328..889K
Parallaxes (mas): 		19.88 [0.96] A 2007A&A...474..653V
Spectral type: 		kA0hA3(IV)SiSr+B9.5IV C 1987ApJS...65..581G
Fluxes (2) :
J 3.628 [1.294] D 2003yCat.2246....0C
H 3.850 [1.114] D 2003yCat.2246....0C
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Hierarchy : number of linked objects
whatever the membership probability is (see description here ) :

: 2 		Display criteria :

Identifiers (23) :
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* gam Ari CEL 179 IDS 01480+1848 AB PLX 391.00
* 5 Ari CSI+18 243 4 IRAS 01507+1902 TIC 91329515
** STF 180AB GEN# +1.00011503 JP11 548 UBV 1885
ADS 1507 AB HIC 8832 2MASS J01533181+1917420 V* gam Ari
AKARI-IRC-V1 J0153318+191741 HIP 8832 NAME Mesarthim WDS J01535+1918AB
BD+18 243 IDS 01483+1849 AB PLX 391

References (63 between 1850 and 2026) (Total 63)
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    Plx : 3    PM : 2   

   

External archives :

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

Data at NED - NASA/IPAC Extragalactic Database : * gam Ari

Link by name to the catalogue in VizieR :

AKARI-IRC-V1 J0153318+191741 BD+18 243 CEL 179 HIC 8832 HIP 8832
IRAS 01507+1902 2MASS J01533181+1917420 PLX 391 V* gam Ari WDS J01535+1918AB

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