2005A&A...431..165S


Query : 2005A&A...431..165S

2005A&A...431..165S - Astronomy and Astrophysics, volume 431, 165-174 (2005/2-3)

Mid-IR observations of circumstellar disks. I. Pre-main sequence objects.

SCHUETZ O., MEEUS G. and STERZIK M.F.

Abstract (from CDS):

We present new N-band photometry and spectroscopy for a sample of eight pre-main sequence stars including T Tauri, Herbig Ae/Be stars and FU Ori objects using the ESO TIMMI2 camera at the La Silla observatory (Chile). For some objects this is their first N-band spectroscopic observation ever. The FU Ori stars V346 Nor, V883 Ori and Z CMa show a broad absorption band which we attribute to silicates, while for BBW 76 we find silicate emission. A comparison with ISO-SWS spectra of V346 Nor and Z CMa taken in 1996/1997 reveals no differences in spectral shape. All T Tauri and Herbig Ae/Be stars possess N-band emission features. We model the emission spectra with a mixture of silicates consisting of different grain sizes and composition. The Herbig Ae star HD 34282 shows strong features of PAHs but none of silicate, while the emission spectrum of the Herbig Ae star HD 72106 resembles those of solar-system comets and known Herbig sources of evolved dust. We demonstrate that HD 72106 is host to highly processed silicates and find evidence for enstatite, which is not common in young objects. Evolved dust is also seen in the T Tauri stars HD 98800 and MP Mus. We further detected MP Mus at 1200µm with the bolometer array SIMBA at the SEST in La Silla. The findings of our analysis are given in the context of previous dust studies of young stellar objects.

Abstract Copyright:

Journal keyword(s): stars: circumstellar matter - stars: planetary systems: protoplanetary disks - stars: pre-main sequence - infrared: stars - techniques: spectroscopic

Simbad objects: 16

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Number of rows : 16
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 V* AB Aur Ae* 04 55 45.8458932216 +30 33 04.292077032 7.20 7.16 7.05 6.96 6.70 A0Ve 1060 2
2 V* V1366 Ori Ae* 05 16 00.4765181328 -09 48 35.393784012 10.19 10.16 9.84 9.77 9.63 B9.5V 208 0
3 V* V883 Ori Or* 05 38 18.1018261392 -07 02 26.017707120           F:I: 211 0
4 V* Z CMa Ae* 07 03 43.1599411656 -11 33 06.209065836 10.51 9.99 8.80     B5/8eq+F5/7 575 3
5 V* V646 Pup Or* 07 50 35.5923145848 -33 06 23.905800180   13.96 12.65 12.04   ~ 69 0
6 HD 72106 ** 08 29 34.89852 -38 36 21.1321       9.32   A0IV 71 0
7 Hen 3-545 Or* 10 59 06.9715593000 -77 01 40.309233240   12.91 11.136   9.596 K4Ve 216 0
8 V* VW Cha Or* 11 08 01.502064 -77 42 28.87524 13.91 14.165 12.761 12.653 10.69 K7+M0 187 0
9 HD 98800 TT* 11 22 05.28975 -24 46 39.7571   10.20 9.28 9.26 7.386 K5V(e) 372 0
10 HD 100453 Ae* 11 33 05.5766482920 -54 19 28.547100696   8.09 7.79     A9Ve 279 1
11 HD 100546 Be* 11 33 25.4408872296 -70 11 41.241297948   6.71 6.30   6.64 A0VaekB8_lB 798 1
12 CPD-68 1894 TT* 13 22 07.5421944624 -69 38 12.219391716   11.38 10.393   9.117 K1Ve 156 0
13 HBC 645 Em* 16 32 27.22 -44 55 36.0           ~ 25 0
14 IRAS 16289-4449 Or* 16 32 32.19264 -44 55 30.6552       15.95   ~ 135 1
15 HD 179218 Ae* 19 11 11.2538919456 +15 47 15.636008472 7.55 7.476 7.39 7.25 7.21 A0Ve 254 0
16 HD 184738 PN 19 34 45.2337620448 +30 30 58.950651240   10.41 10.44     [WC9] 950 0

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