A Radiatively Driven Wind from the ? Tel Debris Disk

Abstract We present far- and near-ultraviolet absorption spectroscopy of the ?23 Myr edge-on debris disk surrounding A0V star ? Telescopii, obtained with Hubble Space Telescope Imaging Spectrograph. detect lines from C i , ii O Mg Al Si S Mn Fe marginally N . The show two clear components at ?22.7 ± 0.5 km s ?1 ?17.8 0.7 which we attribute to circumstellar (CS) interstellar gas, respectively. CO is not detected, find no evidence for star-grazing exocomets. CS are blueshifted by ?16.9 2.6 in star’s reference frame, indicating that they outflowing a radiatively driven wind. C/Fe ratio Tel gas significantly higher than solar ratio, as case ? Pic 49 Cet disks. Unlike those disks, however, measured C/O consistent value. Our analysis shows because an earlier type Cet, more substantial radiation pressure dominant transitions, this species cannot bind it does resulting