2008A&A...489..195M


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.19CEST12:13:11

2008A&A...489..195M - Astronomy and Astrophysics, volume 489, 195-206 (2008/10-1)

Near-IR bispectrum speckle interferometry, AO imaging polarimetry, and radiative transfer modeling of the proto-planetary nebula Frosty Leonis.

MURAKAWA K., OHNAKA K., DRIEBE T., HOFMANN K.-H., OYA S., SCHERTL D. and WEIGELT G.

Abstract (from CDS):

We combined bispectrum speckle interferometry, adaptive optics (AO) imaging polarimetry, and radiative transfer modeling of polarized light to derive various physical properties of the proto-planetary nebula Frosty Leo. We performed bispectrum K'-band speckle interferometry and H- and K-band imaging polarimetry of Frosty Leo using the ESO 3.6m telescope and the AO-equipped CIAO instrument of the 8m Subaru telescope, respectively. Two-dimensional radiative transfer modeling was carried out in order to obtain a quantitative interpretation of our observations. Our diffraction-limited speckle image shows distinct hourglass-shaped, point-symmetric bipolar lobes, an equatorial dust lane, and complex clumpy structures in the lobes. Our polarimetric data display a centro-symmetric polarization vector pattern with P∼30-50% in the bipolar lobes and a polarization disk between them. The polarization images also reveal an elongated region with low polarization along a position angle of -45°. The observations suggest that this region has a low dust density and was carved out by a jet-like outflow. Our radiative transfer modeling can simultaneously explain the observed spectral energy distribution, the intensity distribution of the hourglass-shaped lobes, and our polarization images if we use two grain species with sizes of 0.005≤a≤2.0µm at latitudes between -2° and +2°, and 0.005≤a≤0.7µm in the bipolar lobes. Assuming a distance of 3kpc, an expansion velocity of 25km/s, and a gas-to-dust mass ratio of 160, we derive a dust mass of the disk of 2.85x10–3M, a gas mass-loss rate of 8.97x10–3M/yr, and a total envelope mass of 4.23M.

Abstract Copyright:

Journal keyword(s): Stars: AGB and post-AGB - circumstellar matter - radiative transfer - polarization - method: numerical - methods: observational

Simbad objects: 8

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Number of rows : 8

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 [SSC75] M 78 11 * 05 46 45.3376288328 +00 02 40.311223654 14.08 14.05 13.09     A0II 25 1
2 HD 44179 pA* 06 19 58.2185496 -10 38 14.706068 9.51 9.33 9.02     B9Ib/II 725 0
3 OH 231.8 +4.2 OH* 07 42 16.947 -14 42 50.20           M10III+A 509 1
4 CD-37 4167 C* 08 02 04.9975166437 -38 11 52.162981073   14.1 10.3     C-J4 48 0
5 TYC 824-1188-1 * 09 35 39.0436428712 +12 16 19.393002461   11.19 10.02     ~ 1 0
6 IRAS 09371+1212 pA* 09 39 53.96 +11 58 52.6           K7II/III 159 0
7 OH 17.7 -2.0 pA* 18 30 30.703 -14 28 57.04           ~ 135 1
8 V* V1610 Cyg pA* 21 02 18.27 +36 41 37.0           F5Iae 838 1

    Equat.    Gal    SGal    Ecl

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2021.04.19-12:13:11

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