Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-06-27
Astron.Astrophys. 402 (2003) 767-768
Astronomy and Astrophysics
Astrophysics
9 pages, 7 figures; accepted by A&A
Scientific paper
10.1051/0004-6361:20030404
We analyse the optical and IR spectra, as well as the spectral energy distribution (UV to mm) of the candidate Herbig Ae star HD100453. This star is particular, as it shows an energy distribution similar to that of other isolated Herbig Ae/Be stars (HAEBEs), but unlike most of them, it does not have a silicate emission feature at 10 um, as is shown in Meeus (2001). We confirm the HAEBE nature of HD100453 through an analysis of its optical spectrum and derived location in the H-R diagram. The IR spectrum of HD100453 is modelled by an optically thin radiative transfer code, from which we derive constraints on the composition, grain-size and temperature distribution of the circumstellar dust. We show that it is both possible to explain the lack of the silicate feature as (1) a grain-size effect - lack of small silicate grains, and (2) a temperature effect - lack of small, hot silicates, as proposed by Dullemond (2001), and discuss both possibilities.
Bouwman Jeroen
de Koter Alex
Dominik Carsten
Meeus Gwendolyn
Waters Laurens B. F. M.
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