2002A&A...392.1039M


Query : 2002A&A...392.1039M

2002A&A...392.1039M - Astronomy and Astrophysics, volume 392, 1039-1046 (2002/9-4)

The absence of the 10 µm silicate feature in the isolated Herbig Ae star HD 100453.

MEEUS G., BOUWMAN J., DOMINIK C., WATERS L.B.F.M. and DE KOTER A.

Abstract (from CDS):

We analyse the optical and IR spectra, as well as the spectral energy distribution (UV to mm) of the candidate Herbig Ae star HD 100453. 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 10µm, as is shown in Meeus et al. (2001A&A...365..476M). We confirm the HAEBE nature of HD 100453 through an analysis of its optical spectrum and derived location in the H-R diagram. The IR spectrum of HD 100453 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 et al. (2001ApJ...560..957D), and discuss both possibilities.

Abstract Copyright:

Journal keyword(s): circumstellar matter - stars: pre-main sequence - individual: HD 100453 - ISM: lines and bands

Errata: erratum vol. 402, p. 767 (2003)

Simbad objects: 4

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Number of rows : 4
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 HD 100453 Ae* 11 33 05.5765928993 -54 19 28.543792679   8.09 7.79     A9Ve 224 1
2 HD 100546 Be* 11 33 25.4404858122 -70 11 41.239343121   6.71 6.30   6.64 A0VaekB8_lB 682 1
3 HD 142527 Ae* 15 56 41.8888096574 -42 19 23.245384377   9.04 8.34     F6III 524 1
4 HD 163296 Ae* 17 56 21.2882188601 -21 57 21.872343282 7.00 6.93 6.85 6.86 6.67 A1Vep 879 0

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2021.08.05-13:53:10

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