2007A&A...469..587L


Query : 2007A&A...469..587L

2007A&A...469..587L - Astronomy and Astrophysics, volume 469, 587-593 (2007/7-2)

Resolving the B[e] star Hen 3-1191 at 10µm with VLTI/MIDI.

LACHAUME R., PREIBISCH T., DRIEBE T. and WEIGELT G.

Abstract (from CDS):

We report spatially resolved, spectrally dispersed N-band observations of the B[e] star Hen 3-1191 with the MIDI instrument of the Very Large Telescope Interferometer. The object is resolved with a 40m baseline and has an equivalent uniform disc diameter ranging from 24mas at 8µm to 36mas at 13µm. The MIDI spectrum and visibilities show a curvature which can arise from a weak silicate feature in which the object appears ≃15% larger than in the continuum, but this could result from a change in the object's geometry within the band. We then model Hen's 3-1191 spectral energy distribution (.4-60µm) and N-band visibilities. Because of the unknown nature of the object, we use a wide variety of models for objects with IR excesses. We find the observations to be consistent with a disc featuring an unusually high mass accretion and a large central gap almost void of matter, an excretion disc, and a binary made of two IR sources. We are unable to find a circumstellar shell model consistent with the data. We review the different hypotheses concerning the physical nature of the star and conclude that it is neither a Be supergiant nor a symbiotic star. However, we could not discriminate between the scenario of a young stellar object featuring an unusually strong FU Orionis-like outburst of mass accretion (4-250x10–4M/yr) and that of a protoplanetary nebula with an equatorial mass excretion rate >4x10–5M/yr. In both cases, taking the additional presence of an envelope or wind into account would result in lower mass flows.

Abstract Copyright:

Journal keyword(s): stars: emission-line, Be - stars: individual: Hen 3-1191 - planetary systems: protoplanetary disks - infrared: stars - accretion, accretion disks - technique: interferometric

Simbad objects: 12

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Number of rows : 12
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 * alf Hya * 09 27 35.24270 -08 39 30.9583 5.14 3.42 1.97 0.93 0.16 K3IIIa 419 0
2 * eta Car Em* 10 45 03.5377808928 -59 41 04.051599720 6.37 7.03 6.48 4.90 4.41 OBepec 2326 0
3 * eps Cru PM* 12 21 21.6093625 -60 24 04.129070   5.01 3.59     K3III 87 0
4 * c01 Cen PM* 14 43 39.4396190 -35 10 25.158650   5.40 4.05     K3IIIb 67 0
5 * ome Lup PM* 15 38 03.2037165 -42 34 02.444371 7.47 5.75 4.33 3.30 2.57 K3III 57 0
6 * kap Lib PM* 15 41 56.7924203448 -19 40 43.654786104 8.24 6.30 4.72 3.44 2.50 M0-IIIb 77 0
7 WRAY 15-1484 Em* 16 27 15.1097295456 -48 39 26.852709060   14.6 13.7     B[e] 55 0
8 V* V1071 Sco LP* 16 57 50.2210052016 -39 06 56.609019000   8.37 6.58     M1III 19 0
9 * G Sco * 17 49 51.4808976914 -37 02 35.794961894 5.57 4.38 3.21     K2III 79 0
10 * eta Ser PM* 18 21 18.6005560 -02 53 55.776595 4.84 4.19 3.25 2.55 2.05 K0III-IV 364 0
11 * lam Sgr PM* 18 27 58.2407185 -25 25 18.114589 4.75 3.85 2.81 2.06 1.50 K1IIIb 267 0
12 * eps Aql SB* 18 59 37.3563787320 +15 04 05.811749256 6.14 5.10 4.02 3.26 2.74 K1-IIICN0.5 184 0

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2022.05.21-11:37:31

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