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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
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:
FileName Lrecl Records Explanations
ReadMe 80 . This file list.dat 78 4 List of stars maps/* 0 8 Individual FITS images
Byte-by-byte Description of file: list.dat
Bytes Format Units Label Explanations
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
Acknowledgements: Jeremie Boissier, boissier(at)ira.inaf.it
(End) Patricia Vannier [CDS] 05-May-2011
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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