Hubble imaging of V1331 Cygni: Proper motion study of its circumstellar structures

Abstract

The young star V1331 Cyg received previous attention because it is surrounded by an optical, arc-like reflection nebula. V1331 Cyg is commonly considered to be a candidate for an object that has undergone an FU-Ori (FUOR) the outbreak in the past. This in turn could lead to a time-varying appearance of the dusty arcs that may be revealed by multi-epoch imaging. In particular, a radial colour analysis of the dust arcs can then be attempted to check whether radial grain size distribution was modified by a previous FUOR wind. Second-epoch imaging of V1331 Cyg was obtained by us in 2009 using the Hubble Space Telescope (HST). By comparing this to archival HST data from 2000, we studied the time evolution of the circumstellar nebulae. After a point spread function subtraction using model point spread functions, we used customised routines to perform a proper motion analysis. The nebula expansion was first derived by deconvolving and correlating the two-epoch radial brightness profiles. Additional data from other facilities TLS, UKIDSS, SPITZER, and HERSCHEL were also incorporated to improve our understanding of the star in terms of environment, viewing angle, bipolar outflow length, and the FUOR phenomenon. The derived radial colour profiles do not indicate a spatial separation of the dust grain sizes. The HERSCHEL 160 micron images show for the time thermal emission from dust probably residing in the outer arc. By viewing V1331 Cyg almost pole-on, the length of the bipolar outflow exceeds previous estimates by far. The outer arc expansion timescale is consistent with the implantation time of the CO torus, which supports the hypothesis of an outburst that occurred a few thousand years ago. The azimuthal colour variation of the outer arc is probably due to changes of the scattering angle, imposed by a tilt or helical geometry of the dust configuration.

References in corpus (32)

• The Infrared Array Camera (IRAC) for the Spitzer Space Telescope
• Herschel Space Observatory - An ESA facility for far-infrared and submillimetre astronomy
• The UKIRT Infrared Deep Sky Survey (UKIDSS)
• The SIMBAD astronomical database
• The Photodetector Array Camera and Spectrometer (PACS) on the Herschel Space Observatory
• The VizieR database of Astronomical Catalogues
• Astrometry.net: Blind astrometric calibration of arbitrary astronomical images
• The Wavelength Dependence of Interstellar Extinction from 1.25 to 8.0 microns Using GLIMPSE Data
• Drizzle: A Method for the Linear Reconstruction of Undersampled Images
• The UKIRT Infrared Deep Sky Survey ZYJHK Photometric System: Passbands and Synthetic Colours
• Scattering by Interstellar Dust Grains: Optical and Ultraviolet
• The WFCAM Science Archive
• The UKIRT Wide Field Camera ZYJHK Photometric System: Calibration from 2MASS
• The SCUBA Legacy Catalogue: Continuum Objects Detected by SCUBA
• Radiative Equilibrium and Temperature Correction in Monte Carlo Radiation Transfer
• Scanamorphos: a map-making software for Herschel and similar scanning bolometer arrays
• Spiral Arms in the Asymmetrically Illuminated Disk of MWC 758 and Constraints on Giant Planets
• TASS Mark IV Photometric Survey of the Northern Sky
• Precession of collimated outflows from young stellar objects
• The first INTEGRAL-OMC catalogue of optically variable sources
• Cloudshine: New Light on Dark Clouds
• ALMA observations of a high-density core in Taurus: dynamical gas interaction at the possible site of a multiple star formation
• An Analysis of the Environments of FU Orionis Objects with Herschel
• Parsec-Scale Herbig-Haro Outflows from Intermediate Mass Stars
• The Pointing System of the Herschel Space Observatory. Description, Calibration, Performance and Improvements
• Warm H2O and OH disk emission in V1331 Cyg
• Facing the wind of the pre-FUor V1331 Cyg
• Millimeter interferometric observations of FU Orionis-type objects in Cygnus
• Dust rings and filaments around the isolated young star V1331 Cygni
• Optical and Near-Infrared Shocks in the L988 Cloud Complex
• Long-term evolution of FU Ori-type stars at infrared wavelengths
• SED analysis of class I and class II FU Orionis stars

Cited by in corpus (1)

• Line-dependent veiling in very active T Tauri Stars