AKARI/FIS Mapping of the ISM-Wind Bow Shock around Alpha Ori

Abstract

We present 10' x 50' scan maps around an M supergiant Alpha Ori at 65, 90, 140 and 160 microns obtained with the AKARI Infrared Astronomy Satellite. Higher spatial resolution data with the exact analytic solution permit us to fit the de-projected shape of the stellar wind bow shock around Alpha Ori to have the stand-off distance of 4.8', position angle of 55 degrees and inclination angle of 56 degrees. The shape of the bow shock suggests that the peculiar velocity of Alpha Ori with respect to the local medium is v_* = 40 (n_H)^(-1/2), where n_H is the hydrogen nucleus density at Alpha Ori. We find that the local medium is of n_H = 1.5 to 1.9 cm^(-3) and the velocity of the local flow is at 11 km s^(-1) by using the most recent astrometric solutions for Alpha Ori under the assumption that the local medium is moving away from the Orion OB 1 association. AKARI images may also reveal a vortex ring due to instabilities on the surface of the bow shock as demonstrated by numerical models. This research exemplifies the potential of AKARI All-Sky data as well as follow-up observations with Herschel Space Telescope and Stratospheric Observatory for Infrared Astronomy for this avenue of research in revealing the nature of interaction between the stellar wind and interstellar medium.

8 pages, 2 figures, to be published in PASJ Vol. 60 Special Issue on Recent Results from AKARI

References in corpus (4)

• The Infrared Astronomical Mission AKARI
• The Far-Infrared Surveyor (FIS) for AKARI
• Detection of a Far-Infrared Bow-Shock Nebula Around R Hya: the First MIRIAD Results
• Vortices in the wakes of AGB stars

Cited by in corpus (42)

• Runaway stars as progenitors of supernovae and gamma-ray bursts
• A far-infrared survey of bow shocks and detached shells around AGB stars and red supergiants
• MESS (Mass-loss of Evolved StarS), a Herschel Key Program
• The enigmatic nature of the circumstellar envelope and bow shock surrounding Betelgeuse as revealed by Herschel. I. Evidence of clumps, multiple arcs, and a linear bar-like structure
• Computing the dust distribution in the bowshock of a fast moving, evolved star
• The close circumstellar environment of Betelgeuse - V. Rotation velocity and molecular envelope properties from ALMA
• Interacting supernovae from photoionization-confined shells around red supergiant stars
• 3D Simulations of Betelgeuse's Bow Shock
• Evolutionary tracks for Betelgeuse
• The close circumstellar environment of Betelgeuse - II. Diffraction-limited spectro-imaging from 7.76 to 19.50 microns with VLT/VISIR
• An independent distance estimate to CW Leo
• An Infrared Nebula Associated with Delta Cephei: Evidence of Mass Loss?
• Double bow shocks around young, runaway red supergiants: application to Betelgeuse
• New Evidence for Mass Loss from delta Cephei from HI 21-cm Line Observations
• Large-scale environments of binary AGB stars probed by Herschel - I. Morphology statistics and case studies of R Aquarii and W Aquilae
• Discovery of a detached HI gas shell surrounding alpha Orionis
• Herschel PACS and SPIRE imaging of CW Leo
• Can the magnetic field in the Orion arm inhibit the growth of instabilities in the bow shock of Betelgeuse?
• Infrared Photometric Properties of 709 Candidate Stellar Bowshock Nebulae
• X Her and TX Psc: Two cases of ISM interaction with stellar winds observed by Herschel
• Late Stages of Stellar Evolution - Herschel's contributions
• An HI Imaging Survey of Asymptotic Giant Branch Stars
• The interface between the stellar wind and interstellar medium around R Cassiopeiae revealed by far-infrared imaging
• FOREST Unbiased Galactic Plane Imaging Survey with the Nobeyama 45-m Telescope (FUGIN) IV: Galactic Shock Wave and Molecular Bow Shock in the 4-kpc Arm of the Galaxy
• The astrosphere of the Asymptotic Giant Branch star CIT 6
• The rebrightening of planetary nebulae through ISM interaction
• Exploring the multifaceted circumstellar environment of the Luminous Blue Variable HR Carinae
• A Review of AGB Mass Loss Imaging Techniques
• Polarization simulations of stellar wind bow shock nebulae. I. The case of electron scattering
• Differential Proper-Motion Study of the Circumstellar Dust Shell of the Enigmatic Object, HD 179821
• Dusty shells surrounding the carbon variables S Scuti and RT Capricorni
• Polarization simulations of stellar wind bow shock nebulae. II. The case of dust scattering
• Study of X-ray emission from the S147 nebula by SRG/eROSITA: supernova-in-the-cavity scenario
• A Galactic Dust Devil: far-infrared observations of the Tornado Supernova Remnant candidate
• Faint but not forgotten. I. First results from a search for astrospheres around AGB stars in the far-ultraviolet
• Spitzer and Herschel studies of dust in supernova remnants in the Small Magellanic Cloud
• Surface Brightness Correction for Compact Extended Sources Observed by the AKARI Far-Infrared Surveyor (FIS) in the Slow-Scan Mode
• Using numerical models of bow shocks to investigate the circumstellar medium of massive stars
• AKARI Mission Program: Excavating Mass Loss History in Extended Dust Shells of Evolved Stars (MLHES) I. Far-IR Photometry
• Pulsation and Mass Loss Across the HR Diagram: From OB stars to Cepheids to Red Supergiants
• 3D Smoothed Particle Hydrodynamics Models of Betelgeuse's Bow Shock
• Numerical models for the circumstellar medium around Betelgeuse