The Disk and Environment of Herbig Ae Star HD 100453

Details The Disk and Environment of Herbig Ae Star HD 100453 The Disk and Environment of Herbig Ae Star HD 100453

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.8714c&link_type=abstract

American Astronomical Society Meeting 210, #87.14; Bulletin of the American Astronomical Society, Vol. 39, p.199

Astronomy and Astrophysics

Astronomy

Scientific paper

We present a multi-wavelength examination of the inner disk and environment of the near-ZAMS Herbig Ae star HD 100453. Chandra ACIS-S imagery shows that the Herbig Ae star has Lx=2.6x1029 erg s-1, with Lx/Lbol and a pulse height spectrum similar to β Pic Moving Group early F stars. In addition to the previously noted deficit of warm dust, the inner disk contains little molecular gas either in CO or H2. The disk also lacks the conspicuous Fe II emission and continuum seen in FUV spectra of actively accreting Herbig Ae stars. Our FUSE data suggest an accretion rate below 1x10-9 solar masses per year, while the absence of jet activity in HST ACS imagery suggests a mass loss rate below 3.5x10-11 solar masses per year. The radius of the disk wall inferred by modeling of the IR SED is sufficiently large to preclude photoevaporation of the inner disk as the sole mechanism for disk clearing, suggesting that there may be an additional body in the inner disk. The Chandra data exclude this body being a star of any mass.
KC is supported by a Kentucky Space Grant Consortium Fellowship under NASA National Space Grant College and Fellowship Program Grant NNG05GH07H.

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