2001A&A...365...78A


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.26CET06:09:47

2001A&A...365...78A - Astronomy and Astrophysics, volume 365, 78-89 (2001/1-2)

HST/NICMOS2 coronagraphic observations of the circumstellar environment of three old PMS stars: HD 100546, SAO 206462 and MWC 480.

AUGEREAU J.-C., LAGRANGE A.-M., MOUILLET D. and MENARD F.

Abstract (from CDS):

The close environment of four old Pre-Main Sequence stars has been observed thanks to the coronagraphic mode of the HST/NICMOS2 camera at λ=1.6µm. In the course of this program, a circumstellar annulus around HD 141569 was detected and has already been presented in Augereau et al. (1999A&A...350L..51A). In this paper, we report the detection of an elliptical structure around the Herbig Be star HD 100546 extending from the very close edge of the co mask (∼50AU) to 350-380AU (3.5-3.8") from the star. The axis ratio gives a disk inclination of 51°±3° to the line-of-sight and a position angle of 161°±5°, measured east of north. At 50AU, the disk has a surface brightness between 10.5 and 11mag/arcsec2, then follows a -2.92±0.04 radial power law up to 250-270AU and finally falls as r–5.5±0.2. The inferred optical thickness suggests that the disk is at least marginally optically thick inside 80AU and optically thin further out. Combined with anisotropic scattering properties, this could explain the shape of a brightness asymmetry observed along the minor axis of the disk. This asymmetry needs to be confirmed. The circumstellar disks around SAO 206462 and MWC 480 are not resolved, leading to constraints on the dust distribution. A tight binary system separated by only 0.32"±0.04" is nevertheless detected in the close vicinity of SAO 206462.

Abstract Copyright:

Journal keyword(s): stars: circumstellar matter - stars: individual: HD 100546, SAO 206462, MWC 480 - stars: pre-main sequence

Nomenclature: Table 3, Fig.1: [ALM2001] HD 100546 A (Nos B, C, D).

CDS comments: close binary near SAO 206462 not in SIMBAD.

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 HD 29646 * 04 41 19.7607530516 +28 36 53.962169646   5.736 5.729     A2V 66 0
2 HD 31648 Ae* 04 58 46.2654165113 +29 50 36.990341242 7.84 7.78 7.62 7.76 7.43 A5Vep 399 0
3 * bet Pic PM* 05 47 17.0876901 -51 03 59.441135 4.13 4.03 3.86 3.74 3.58 A6V 1668 1
4 DCld 296.2-07.9 DNe 11 32 47 -69 42.4           ~ 16 0
5 [GPH2001] J113325.17-701145.6 * 11 33 25.17 -70 11 45.6   19.00 18.11   17.14 K4V 5 0
6 HD 100546 Be* 11 33 25.4404858122 -70 11 41.239343121   6.71 6.30   6.64 A0VaekB8_lB 658 1
7 [AGK2007] 5 * 11 33 25.86 -70 11 45.9   19.37 18.42   17.44 K4V 5 0
8 HD 106797 * 12 17 06.3093124011 -65 41 34.651365063   6.073 6.054     A0V 49 0
9 HD 109573 PM* 12 36 01.0317721349 -39 52 10.222698506   5.786 5.774 7.25 5.81 A0V 560 1
10 CPD-36 6759 Y*O 15 15 48.4459023859 -37 09 16.026315179   9.21 8.708     F8V 361 1
11 HD 135344 * 15 15 48.9457954324 -37 08 55.727525343   7.84 7.76     A0V 128 1
12 HD 141569 pr* 15 49 57.7484743862 -03 55 16.344023102 7.22 7.20 7.12 7.00 7.04 A2VekB9mB9(_lB) 474 0
13 HD 163296 Ae* 17 56 21.2882188601 -21 57 21.872343282 7.00 6.93 6.85 6.86 6.67 A1Vep 818 0
14 [ALM2001] HD 100546 C * ~ ~           ~ 2 0

    Equat.    Gal    SGal    Ecl

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2020.10.26-06:09:47

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