Evidence of Planetesimal infall on to the very young Herbig Be star LkH$_\alpha$234
作者： Suvrath Mahadevan , Jian Ge , Abhijit Chakraborty
DOI: 10.1086/421049
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摘要: We report here the first evidence for planetesimal infall onto very young Herbig Be star LkH$_\alpha$234. These results are based on observations acquired over 31 days using spectroscopy of sodium D lines, He I 5876\AA, and hydrogen H$_\alpha$ lines. find Redshifted Absorption Components (RAC) with velocities up to 200 km/s mild Blueshifted (BEC) 100 in Na No correlation is observed between appearance RAC & BEC line variability, which suggests that these (Na BEC) formed a process unrelated circumstellar gas accretion. interpret as an infalling evaporating body, greater than km diameter, able survive at distances 2.0 0.1 AU from star. The dramatic readily explained by dynamics this body making LkH$_\alpha$234 youngest (age $\sim$ Myr) system presence planetesimals.
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