1999A&AS..138..163A


Query : 1999A&AS..138..163A

1999A&AS..138..163A - Astron. Astrophys., Suppl. Ser., 138, 163-176 (1999/July-0)

Acquisition and analysis of adaptive optics imaging polarimetry data.

AGEORGES N. and WALSH J.R.

Abstract (from CDS):

The process of data taking, reduction and calibration of near-infrared imaging polarimetry data taken with the ESO Adaptive Optics System ADONIS is described. The ADONIS polarimetric facility is provided by a rotating wire grid polarizer. Images were taken at increments of 22.5° of polarizer rotation from 0 to 180°, over-sampling the polarization curve but allowing the effects of photometric variations to be assessed. Several strategies to remove the detector signature are described. The instrumental polarization was determined, by observations of stars of negligible polarization, to be 1.7% at J, H and K bands. The lack of availability of unpolarized standard stars in the IR, in particular which are not too bright as to saturate current IR detectors, is highlighted. The process of making polarization maps is described. Experiments at restoring polarimetry data, in order to reach diffraction limited polarization, are outlined, with particular reference to data on the Homunculus reflection nebula around η Carinae.

Abstract Copyright:

Journal keyword(s): instrumentation: polarimeters - instrumentation: adaptive optics - techniques: image processing - ISM: η Car nebulae

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 - 2023
#notes
1 V* R Mon Ae* 06 39 09.9542000448 +08 44 09.539482632 10.76 12.46 11.85 10.96 10.25 B8IIIe 513 0
2 OH 231.8+04.2 OH* 07 42 16.947 -14 42 50.20           M10III+A 530 0
3 HD 64299 * 07 52 25.5094475256 -23 17 46.749110748   10.27 10.11     A1V 35 0
4 NAME Homunculus Nebula ISM 10 45 03.5 -59 41 04           ~ 358 1
5 * eta Car Em* 10 45 03.5377808928 -59 41 04.051599720 6.37 7.03 6.48 4.90 4.41 OBepec 2388 0
6 HD 93737 sg* 10 48 05.4067650264 -59 55 08.985023076   6.230 6.015     A0Ia/ab 55 0
7 * u Car PM* 10 53 29.6561115087 -58 51 11.413331344 5.39 4.74 3.79 3.07 2.57 K0IV 94 0
8 HD 95410 SB* 11 00 07.3235172624 -50 29 39.024789432   9.25 8.78     F5V 14 0
9 V* V1610 Cyg pA* 21 02 18.27 +36 41 37.0           F5Iae 864 1

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2023.06.03-19:33:45

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