2006A&A...445.1015O


C.D.S. - SIMBAD4 rel 1.7 - 2020.08.04CEST22:30:10

2006A&A...445.1015O - Astronomy and Astrophysics, volume 445, 1015-1029 (2006/1-3)

High angular resolution N-band observation of the silicate carbon star IRAS08002-3803 with the VLTI/MIDI instrument. Dusty environment spatially resolved.

OHNAKA K., DRIEBE T., HOFMANN K.-H., LEINERT C., MOREL S., PARESCE F., PREIBISCH T., RICHICHI A., SCHERTL D., SCHOELLER M., WATERS L.B.F.M., WEIGELT G. and WITTKOWSKI M.

Abstract (from CDS):

We present the results of N-band spectro-interferometric observations of the silicate carbon star IRAS08002-3803 with the MID-infrared Interferometric instrument (MIDI) at the Very Large Telescope Interferometer (VLTI) of the European Southern Observatory (ESO). The observations were carried out using two unit telescopes (UT2 and UT3) with projected baseline lengths ranging from 39 to 47m. Our observations of IRAS08002-3803 have spatially resolved the dusty environment of a silicate carbon star for the first time and revealed an unexpected wavelength dependence of the angular size in the N band: the uniform-disk diameter is found to be constant and ∼36mas (72R*) between 8 and 10µm, while it steeply increases longward of 10µm to reach ∼53mas (106R*) at 13µm. Model calculations with our Monte Carlo radiative transfer code show that neither spherical shell models nor axisymmetric disk models consisting of silicate grains alone can simultaneously explain the observed wavelength dependence of the visibility and the spectral energy distribution (SED). We propose that the circumstellar environment of IRAS08002-3803 may consist of two grain species coexisting in the disk: silicate and a second grain species, for which we consider amorphous carbon, large silicate grains, and metallic iron grains. Comparison of the observed visibilities and SED with our models shows that such disk models can fairly - though not entirely satisfactorily - reproduce the observed SED and N-band visibilities. Our MIDI observations and the radiative transfer calculations lend support to the picture where oxygen-rich material around IRAS08002-3803 is stored in a circumbinary disk surrounding the carbon-rich primary star and its putative low-luminosity companion.

Abstract Copyright:

Journal keyword(s): infrared: stars - techniques: interferometric - stars: circumstellar matter - stars: carbon - stars: AGB and post-AGB - stars: individual: IRAS08002-3803

Simbad objects: 14

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Number of rows : 14

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 OH 127.8 -0.0 OH* 01 33 51.21 +62 26 53.2           M9III 174 0
2 * eta Eri PM* 02 56 25.6494839 -08 53 53.322099 5.97 4.99 3.87 3.08 2.50 K1+IIIb 178 0
3 * 17 Mon * 06 47 19.8294628711 +08 02 14.123889454 7.82 6.17 4.77 3.74 3.04 K4III 110 0
4 V* BM Gem C* 07 20 59.0073994507 +24 59 58.090785507     11.50     C-J5- 139 1
5 CD-37 4167 C* 08 02 04.9975166437 -38 11 52.162981073   14.1 10.3     C-J4 48 0
6 HD 67582 V* 08 06 40.3398234615 -45 15 57.649421396   6.502 5.021     K3III 27 0
7 V* RX Pup Sy* 08 14 12.3036011353 -41 42 29.086820756   12.39 9.00     M5.5 192 1
8 IRAS 09425-6040 C* 09 44 01.6685286753 -60 54 25.636690927     12.6     C 54 0
9 WRAY 16-62 Sy* 09 54 43.2843108572 -57 18 52.397916164   13.77 12.92 13.01 10.93 M5-7.5 94 0
10 HD 85951 PM* 09 54 52.2067796442 -19 00 33.608990506 8.44 6.51 4.94     K5III 47 0
11 * eps Cru PM* 12 21 21.6093625 -60 24 04.129070   5.01 3.59     K3III 82 0
12 HD 120404 * 13 51 47.4342248812 -69 24 04.515687153   7.459 5.727     K5/M0III 22 0
13 V* RR Sco Mi* 16 56 37.8414071798 -30 34 48.189816056 8.46 7.64 6.10     M6+e 145 0
14 MSB 38 C* 20 36 07.3863551706 +60 05 26.037276961   13.98 9.86 10.3   C-J4+ 116 0

    Equat.    Gal    SGal    Ecl

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2020.08.04-22:30:10

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