High-resolution polarimetry of Parsamian 21: revealing the structure of an edge-on FU Ori disc★

摘要: We present the first high spatial resolution near-infrared direct and polarimetric observations of Parsamian 21, obtained with Nasmyth Adaptive Optics System-CONICA instrument at Very Large Telescope (VLT). complemented these measurements archival infrared observations, such as Hubble Space (HST)/Wide Field Planetary Camera 2 (WFPC2) imaging, HST/Near Infrared Multi-Object Spectrometer (NICMOS) polarimetry, photometry Spitzer Telescope’s Array (IRAC) Multiband Imaging Photometer (MIPS), spectroscopy Spitzer’s Spectrograph (IRS), well Observatory (ISO) photometry. Our main conclusions are follows: (1) we argue that 21 is probably an FU Orionis-type object (FUor); (2) not associated any rich cluster young stars; (3) our reveal a circumstellar envelope, polar cavity edge-on disc; disc seems to be geometrically flat extends from approximately 48 360 au star; (4) spectral energy distribution (SED) can reproduced simple model envelope; (5) within framework evolutionary sequence FUors proposed by Green et al. Quanz al., classified intermediate-aged object.