J/A+A/531/A50 1.3mm and 3mm emission maps or 4 Ae/Be stars (Boissier+, 2011)
Massive young disks around Herbig Ae stars.
Boissier J., Alonso-Albi T., Fuente A., Berne O., Bachiller R., Neri R.,
Ginard D.
<Astron. Astrophys. 531, A50 (2011)>
=2011A&A...531A..50B 2011A&A...531A..50B
ADC_Keywords: Stars, pre-main sequence ; Stars, emission ;
Millimetric/submm sources ; Radio continuum
Keywords: stars: individual: BD+61154 - stars: individual: RR Tau -
stars: pre-main sequence - stars: individual: VY Mon -
protoplanetary disks - stars: individual: LkHα 198
Abstract:
Herbig Ae stars (HAe) are the precursors of Vega-type systems and,
therefore, crucial objects in planet formation studies. Thus far, only
a few disks associated with HAe stars have been studied using
millimetre interferometers. Our aim is to determine the dust evolution
and the lifetime of the disks associated with Herbig Ae stars.
We imaged the continuum emission at ∼3mm and ∼1.3mm of the Herbig
Ae/Be stars BD+61154, RR Tau, VY Mon and LkHα 198 using the
Plateau de Bure Interferometer (PdBI). These stars are in the upper
end of the stellar mass range of the Herbig Ae stars (M*>3M☉).
Our measurements were used to complete the Spectral Energy
Distribution (SED). The modelling of the SED, in particular the FIR-mm
part, allow us to determine the masses and dust properties of these
disks. We detected the disks associated with BD+61154, RR Tau and
VY Mon with disk masses of 0.35M☉, 0.05M☉ and 0.40M☉
respectively. The disk around LkHα 198 was not detected with an
upper limit to the disk mass of 0.004M☉. We detected, however,
the disks associated with the younger stellar objects LkHα
198--IR and LkHα 198--mm that are located in the vicinity of
LkHα 198. The fitting of the mm part of the SED reveal that the
grains in the mid-plane of the disks around BD+61154, RR Tau and VY
Mon have sizes of ∼1-1000um. Therefore, grains have not grown to
centimetre sizes in these disks yet.
These massive (M*>3M☉) and young (∼1Myr) HAe stars are
surrounded by massive (≳0.04M☉) disks with grains of
micron-millimetre sizes.
Although grain growth is proceeding in these disks, their evolutionary
stage is prior to the formation of planetesimals. These disks are less
evolved than those detected around T Tauri and Herbig Be stars.
Description:
We carried out interferometric observations in the continuum around
1.3mm and 3.0mm toward 4 stars: BD+61 654, LkHa 198, RR Tau, VY Mon.
These objects are HAeBe stars with stellar masses of 3 to 7 solar
masses located at distances of 600-800pc from the Sun. All the
sources were observed in 2008-2009 using the PdBI (Plateau de Bure
interferometer, see Cat. B/iram) in different configurations. We make
available here the deconvolved (clean) maps constructed from these
observations. The units of the map are Jy per Beam. The data reduction
was performed using the GILDAS software package. The continuum maps
were built summing all the channels free of line emission in the data.
Natural weighting has been applied to the measured visibilities.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 78 4 List of stars
maps/* . 8 Individual FITS images
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Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Name Simbad name
10- 11 I2 h RAh Simbad Hour of Right Ascension (J2000.0)
13- 14 I2 min RAm Simbad Minute of Right Ascension (J2000.0)
16- 19 F4.1 s RAs Simbad Second of Right Ascension (J2000.0)
21 A1 --- DE- Simbad Sign of the Declination (J2000.0)
22- 23 I2 deg DEd Simbad Degree of Declination (J2000.0)
25- 26 I2 arcmin DEm Simbad Arcminute of Declination (J2000.0)
28- 29 I2 arcsec DEs Simbad Arcsecond of Declination (J2000.0)
31- 35 F5.2 mag Bmag Simbad B band magnitude
37- 41 F5.2 mag Vmag ? Simbad V band magnitude
43- 51 A9 --- SpType Simbad MK spectral type
54- 65 A12 --- 1mm Name of the fits file with 1mm image (512/512,
0.1arcsec/pix) in maps subdirectory
67- 78 A12 --- 3mm Name of the fits file with 3mm image (512/512,
0.1arcsec/pix) in maps subdirectory
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Acknowledgements:
Jeremie Boissier, boissier(at)ira.inaf.it
(End) Patricia Vannier [CDS] 05-May-2011