1998A&A...336..565H


Query : 1998A&A...336..565H

1998A&A...336..565H - Astronomy and Astrophysics, volume 336, 565-586 (1998/8-2)

Infrared imaging and millimetre continuum mapping of Herbig Ae/Be and FU Orionis stars.

HENNING T., BURKERT A., LAUNHARDT R., LEINERT C. and STECKLUM B.

Abstract (from CDS):

The goal of this paper is a detailed analysis of the dusty environment of Herbig Ae/Be stars and FU Orionis objects. For this purpose we mapped 22 regions at 1.3mm wavelength containing 25 target objects. We found that it is indispensable to perform mapping in contrast to pointed On-On measurements in order to obtain the correct distribution of cold material around young stellar objects and to relate 1.3mm flux densities to individual sources. To get reliable information about the structure and shape of the dust configurations and their relation to the stellar sources, we superimposed the millimetre maps on near-infrared images. The comparison of the data demonstrated that some of the Herbig Ae/Be stars are not associated with the peak of the millimetre emission. This is obviously the case for V376 Cas/LkHα 198, MWC 137, CoD -42°11721, and V1685 Cyg/V1686 Cyg. We found two different morphologies of the dust envelopes: 6 regions show a compact structure, whereas 12 regions are characterized by a core/envelope structure. The ``disk'' objects AB Aur and HD 163296 show only a compact core and are not surrounded by an extended envelope. We did not detect HK Ori, HD 250550, LkHα 25, and V1515 Cyg which all have low IRAS luminosities. Based on the flux densities derived from the millimetre maps, we estimated characteristic physical parameters like density and mass assuming optically thin emission. The total masses of the circumstellar regions around the Herbig Ae/Be stars with core/envelope structure and with ``genuine" point-like millimetre sources are 80±60M and 0.15±0.15M, respectively. The lowest and highest masses of the circumstellar material were found around ABAur (0.03M) and CoD -42°11721 (1100M), respectively. The average densities in the cores range from 105 to 108cm–3. The densities of the extended envelopes are of the order of 104 to 105cm–3. In addition, we combined the measured millimetre flux densities with infrared and optical data and modelled the broad-band spectral energy distributions using spherically symmetric models. We found good fits for both the core sources (AB Aur, V1331 Cyg) and the core/envelope objects (VY Mon, LkHα 234) we considered for modelling. The parameters derived this way are generally in good agreement with data directly derived from the maps. However, the possibility to fit the spectral energy distribution of AB Aur which is known to be associated with a disk clearly demonstrates that a good ``spherical'' fit cannot be used as an argument against the presence of a disk.

Abstract Copyright:

Journal keyword(s): stars: formation - stars: pre-main-sequence - ISM: clouds - dust, extinction - radio continuum: ISM - circumstellar matter

Simbad objects: 43

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Number of rows : 43
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 LDN 1265 DNe 00 09.6 +58 52           ~ 15 0
2 EM* LkHA 198 Ae* 00 11 25.8495450336 +58 49 28.713961920   14.65 13.79 14.03   B9e 222 0
3 V* V376 Cas Ae* 00 11 26.5410514344 +58 50 03.929517960           A3/F2e 96 1
4 NAME [BM89] L1495 PoC 04 14 08.2 +28 09 31           ~ 170 0
5 LDN 1495 DNe 04 18.1 +27 37           ~ 327 1
6 V* V892 Tau Ae* 04 18 40.6157618376 +28 19 15.625058880   16.6 14.69 14.35   A0Ve 279 0
7 LDN 1519 DNe 04 55.7 +30 35           ~ 16 0
8 V* AB Aur Ae* 04 55 45.8458932216 +30 33 04.292077032 7.20 7.16 7.05 6.96 6.70 A0Ve 992 2
9 V* HK Ori Ae* 05 31 28.049808 +12 09 10.30212 11.82 12.235 11.716 11.632 10.56 A2?e+G0?e 184 1
10 HD 250550 Ae* 06 01 59.9892055464 +16 30 56.727549864   9.60 9.593 9.64   B9e 238 1
11 [DB2002b] G192.63-3.05 MoC 06 02 00 +16 31.0           ~ 26 0
12 Ass Gem OB 1 As* 06 09.8 +21 35           ~ 178 0
13 EM* MWC 137 Ae* 06 18 45.5220873216 +15 16 52.244494608 12.89 13.30 13.759 11.67 10.31 sgB[e]d 236 1
14 V* VY Mon Ae* 06 31 06.9271406952 +10 26 04.952351076 16.65 15.45 13.70 12.49 11.00 A5:Vep 92 0
15 LDN 1605 DNe 06 32.8 +10 38           ~ 15 0
16 NAME Mon I MoC 06 35 +10.1           ~ 227 0
17 EM* LkHA 25 Ae* 06 40 44.6376365304 +09 48 02.151653868 12.745 13.03 12.88 12.545 12.386 B4Ve 136 0
18 NGC 2264 OpC 06 40 52 +09 52.6           ~ 1682 0
19 V* Z CMa Ae* 07 03 43.1599411656 -11 33 06.209065836 10.51 9.99 8.80     B5/8eq+F5/7 553 3
20 NAME CMa R1 As* 07 08 21.3 -11 04 50           ~ 81 1
21 NAME Cha 1 MoC 11 06 48 -77 18.0           ~ 1058 1
22 HD 97048 Ae* 11 08 03.3109731720 -77 39 17.490777444 9.03 8.76 9.00   8.64 A0Vep 497 0
23 DCld 296.2-07.9 DNe 11 32 47 -69 42.4           ~ 16 0
24 HD 100546 Be* 11 33 25.4408872296 -70 11 41.241297948   6.71 6.30   6.64 A0VaekB8_lB 717 1
25 V* DK Cha Or* 12 53 17.2111480272 -77 07 10.736046012           F0 136 0
26 NAME Cha II MoC 12 54 -77.2           ~ 313 0
27 CD-42 11721 Be* 16 59 06.7629322176 -42 42 08.404228224 12.16 12.28 11.00     B0IVe 161 0
28 HD 163296 Ae* 17 56 21.2881851168 -21 57 21.871819008 7.00 6.93 6.85 6.86 6.67 A1Vep 953 0
29 NAME Aql Rift DNe 18 32 -01.0           ~ 283 1
30 Parsamian 21 Or* 19 29 00.8740757136 +09 38 42.862226208   15.18 14.07 13.93   F5Iabe 84 0
31 LDN 895 DNe 20 15.7 +42 39           ~ 5 0
32 Ass Cyg OB 1 As* 20 17.8 +37 38           ~ 259 1
33 BD+40 4124 Ae* 20 20 28.2413946720 +41 21 51.529070088 11.11 11.36 10.62 10.510   B2Ve 286 1
34 EM* LkHA 224 Ae* 20 20 29.3503944888 +41 21 28.410038964 14.82 14.08 12.93 12.05 11.08 A4:Ve 98 0
35 EM* LkHA 225 Ae* 20 20 30.5955531672 +41 21 26.370826704   18.2 19.17     A4:Ve 81 0
36 Ass Cyg OB 9 As* 20 21 +39.9           ~ 126 0
37 V* V1515 Cyg Or* 20 23 48.0158573016 +42 12 25.781279076   15.26 13.39 12.03   G0/G2Ib 226 0
38 LDN 981 DNe 21 00 15 +50 17.3           ~ 14 0
39 EM* LkHA 120 Or* 21 01 09.2070147480 +50 21 44.806779000 13.37 13.09 11.99 11.75   F0/F4-G5 189 1
40 Ass Cyg OB 7 As* 21 08 +47.6           ~ 204 0
41 EM* LkHA 234 Ae* 21 43 06.8218113480 +66 06 54.202272804 13.65 13.61 12.73 11.98 11.20 B5Ve 282 0
42 NGC 7128 OpC 21 43 58 +53 42.9   10.54 9.7     ~ 66 0
43 EM* MWC 1080 Ae* 23 17 25.5895018656 +60 50 43.444557384   13.24 11.542     B0eq 315 0

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2022.05.24-08:37:32

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