Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...291..546h&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 291, no. 2, p. 546-556
Astronomy and Astrophysics
Astronomy
73
Cosmic Dust, Pre-Main Sequence Stars, Radiative Transfer, Stellar Envelopes, Stellar Luminosity, Astronomical Models, Emission Spectra, Infrared Radiation, Radio Spectra, Sky Surveys (Astronomy), Spectral Energy Distribution
Scientific paper
The results of a 1.3 millimeter continuum pilot search for cold dust around southern Herbig Ae/Be stars are presented. Significant millimeter flux was detected from 17 of the 33 target objects. The data show no significant correlation between the infrared spectral index and the circumstellar dust mass. However, the Lada class II objects have in the average lower masses compared with the class I objects pointing to an evolutionary effect. Analyzing the relation between fluxes scaled to a fixed distance and luminosities, we find a linear dependence in agreement with a relation found for less luminous young stellar objects. We use a radiative transfer code for spherically symmetric envelopes with different dust components to model the spectra of selected objects and to deduce the dust mass. The spherical model fails to account for the high millimeter flux in the flat spectrum of the class II object HD 163296 even if amorphous carbon and fractal dust particles are considered. In this case, we applied a thin disk model which results in a flat energy distribution and can explain the 1.3 mm flux. In addition, we discuss the R Coronae Australis region in more detail. We show that the strongest millimeter source in this area is not R CrA or T CrA but the deeply embedded infrared source IRS 7 which shares a number of properties with the well-known source L 1551-IRS5.
Henning Th
Launhardt Ralf
Steinacker Juergen
Thamm E.
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