Crystalline silicate feature of the Vega-like star HD145263 - INSPIRE

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Crystalline silicate feature of the Vega-like star HD145263

Jun, 2004

4 pages

Published in:

Astrophys.J.Lett. 610 (2004) L49-52

e-Print:

astro-ph/0406508 [astro-ph]

DOI:

10.1086/423242

View in:

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Abstract: (arXiv)

We have observed the 8-13

\mu

m spectrum (R

\sim

250) of the Vega-like star candidate HD145263 using Subaru/COMICS. The spectrum of HD145263 shows the broad trapezoidal silicate feature with the shoulders at 9.3

\mu

m and 11.44

\mu

m, indicating the presence of crystalline silicate grains. This detection implies that crystalline silicate may also be commonly present around Vega-like stars. The 11.44

\mu

m feature is slightly shifted to a longer wavelength compared to the usual 11.2-3

\mu

m crystalline forsterite feature detected toward Herbig Ae/Be stars and T Tauri stars. Although the peak shift due to the effects of the grain size can not be ruled out, we suggest that Fe-bearing crystalline olivine explains the observed peak wavelength fairly well. Fe-bearing silicates are commonly found in meteorites and most interplanetary dust particles, which originate from planetesimal-like asteroids. According to studies of meteorites, Fe-bearing silicate must have been formed in asteroidal planetesimals, supporting the scenario that dust grains around Vega-like stars are of planetesimal origin, if the observed 11.44

\mu

m peak is due to Fe-bearing silicates.

circumstellar matter
infrared: stars
planetary systems

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