2009A&A...502..175B


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.17CEST03:39:48

2009A&A...502..175B - Astronomy and Astrophysics, volume 502, 175-187 (2009/7-4)

A spatial study of the mid-IR emission features in four Herbig Ae/Be stars.

BOERSMA C., PEETERS E., MARTIN-HERNANDEZ N.L., VAN DER WOLK G., VERHOEFF A.P., TIELENS A.G.G.M., WATERS L.B.F.M. and PEL J.W.

Abstract (from CDS):

Infrared (IR) spectroscopy and imaging provide a prime tool to study the characteristics of polycyclic aromatic hydrocarbon (PAH) molecules and the mineralogy in regions of star formation. Herbig Ae/Be stars are known to have varying amounts of natal cloud material present in their vicinity. Our aim is to study the characteristics of the mid-IR emission originating in Herbig Ae/Be stars, especially the extent of the emission and how this relates to the (proto-)stellar characteristics.Today's powerful ground- and space-based telescopes provide images and spectra at unprecedented spectral and spatial resolution. We analyse the images and spectra from four Herbig Ae/Be stars (IRAS 06084-0611, CD-42 11721, TY CrA, and HD176386), as obtained with TIMMI2 on the ESO 3.6 m telescope and VISIR on the VLT. These observations are supplemented with data from ISO-SWS and Spitzer-IRAC. We find evidence for large-scale structure and extended emission in all four sources, except for HD176386, which only shows silicate emission, all sources show PAH emission in their spectra. In addition, a spatially resolved silicate and PAH spectrum could be extracted for TY CrA.The variety in emission scales distinguishes two classes. In the first, the morphology and spectral characteristics resemble those of reflection nebulae. In the second, the characteristics are in-line with Herbig A stars. This separation simply reflects a difference in stellar characteristics (e.g. luminosity). In Herbig B stars, dust emission from the surroundings dominates, where for Herbig A stars, the disk dominates the emission. In this scheme, IRAS 06084-0611 and CD-42 11721 resemble reflection nebulae and HD176386 a more typical Herbig Ae/Be star. TY CrA shows characteristics common to both genuine reflection nebulae and Herbig B stars. We propose a geometry for TY CrA, with most notably, a ∼70AU inner gap in the 340AU circumtertiary disk cleared by a fourth stellar companion.

Abstract Copyright:

Journal keyword(s): techniques: spectroscopic - infrared: ISM - ISM: molecules - astrochemistry

Simbad objects: 19

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Number of rows : 19

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 HD 17386 ** 02 46 59.222760 -09 52 03.00504   10.12 9.65 9.88   F3/6(V) 7 0
2 NGC 2023 RNe 05 41 37.9 -02 15 52           ~ 559 1
3 * gam Pic PM* 05 49 49.6618144 -56 09 59.980752   5.589 4.494     K1III 63 0
4 NGC 2183 HII 06 10 50.2 -06 12 01           ~ 70 0
5 [GRG2000] VLA 4 Rad 06 10 50.30 -06 11 57.4           ~ 7 0
6 [HWJ85] 4 IR 06 10 50.5 -06 11 49           ~ 2 0
7 [GRG2000] VLA 1 HII 06 10 50.52 -06 11 49.8           ~ 11 0
8 * nu.02 CMa PM* 06 36 41.0375756 -19 15 21.165905 5.96 5.011 3.91 3.13 2.61 K1.5III-IVFe1 235 1
9 HD 97048 Ae* 11 08 03.3105687971 -77 39 17.491180130 9.03 8.76 9.00   8.64 A0Vep 435 0
10 * eta Ara * 16 49 47.1565275 -59 02 28.957499   5.306 3.744     K5III 60 0
11 CD-42 11721 Be* 16 59 06.7622892572 -42 42 08.404916931 12.16 12.28 11.00     B0IVe 152 1
12 NGC 6726 RNe 19 01 38 -36 53.5           ~ 33 0
13 HD 176386 Y*O 19 01 38.93200 -36 53 26.5615 7.28 7.33 7.21     B9V 110 0
14 HD 176386B Y*O 19 01 39.1676654527 -36 53 29.460027237           K7: 14 1
15 V* TY CrA Ae* 19 01 40.8312189956 -36 52 33.801844387 10.03 9.92 9.39     B9e 266 0
16 * bet CrA * 19 10 01.7558032 -39 20 26.864359   5.281 4.095     K0II/IIICNIb 49 0
17 NAME CrA Complex reg 19 15 00.0 -37 30 00           ~ 101 1
18 BD+40 4124 Ae* 20 20 28.2415737117 +41 21 51.527810947 11.11 11.36 10.62 10.510   B2Ve 271 1
19 NGC 7023 BNe 21 01 36.9 +68 09 48   7.20       ~ 604 0

    Equat.    Gal    SGal    Ecl

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2019.10.17-03:39:48

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