English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
 
 
DownloadE-Mail
 Local TagsRelease HistoryDetailsSummary
  A VLBI study of the wind-wind collision region in the massive multiple HD 167971

Sanchez-Bermudez, J., Alberdi, A., Schödel, R., Brandner, W., Galván-Madrid, R., Guirado, J. C., et al. (2019). A VLBI study of the wind-wind collision region in the massive multiple HD 167971. Astronomy and Astrophysics, 624.

Item is

 

show all hide all

Basic

show hide
Item Permalink: https://hdl.handle.net/21.11116/0000-0005-D26A-7 Version Permalink: https://hdl.handle.net/21.11116/0000-0005-D26B-6
Genre: Journal Article

Files

show Files

Locators

show
hide
Locator:
https://ui.adsabs.harvard.edu/abs/2019A&A...624A..55S (Any fulltext)
Description:
-
OA-Status:

Creators

show
hide
 Creators:
Sanchez-Bermudez, J.1, Author
Alberdi, A.1, Author
Schödel, R.1, Author
Brandner, W.1, Author
Galván-Madrid, R.1, Author
Guirado, J. C.1, Author
Herrero-Illana, R.1, Author
Hummel, C. A.1, Author
Marcaide, J. M.1, Author
Pérez-Torres, M. A.1, Author
Affiliations:
1Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners, ou_2421692              

Content

show
hide
Free keywords: radiation mechanisms: non-thermal techniques: high angular resolution techniques: interferometric binaries: general stars: massive stars: mass-loss Astrophysics - Solar and Stellar Astrophysics
 Abstract: Context. Colliding winds in massive binaries are able to accelerate particles up to relativistic speeds as the result of the interaction between the winds of the different stellar components. HD 167971 exhibits this phenomenon which makes it a strong radio source.
Aims: We aim at characterizing the morphology of the radio emission and its dependence on the orbital motion, traced independently by near- infrared (NIR) interferometry of both the spectroscopic binary and the tertiary component comprising HD 167971.
Methods: We analyze 2006 and 2016 very long baseline interferometric data at C and X bands. We complement our analysis with a geometrical model of the wind-wind collision region and an astrometric description of the system.
Results: We confirm that the detected nonthermal radio emission is associated with the wind-wind collision region of the spectroscopic binary and the tertiary component in HD 167971. The wind-wind collision region changes orientation in agreement with the orbital motion of the tertiary around the spectroscopic binary. The total intensity also changes between the two observing epochs in a way that is inversely proportional to the separation between the two components, with a negative-steep spectral index typical of an optically thin synchrotron emission possibly steepened by an inverse Compton cooling effect. The wind-wind collision bow-shock shape and its position with respect to the stars indicates that the wind momentum from the spectroscopic binary is stronger than that of the tertiary. Finally, the astrometric solution derived for the stellar system and the wind-wind collision region is consistent with independent Gaia data.

Details

show
hide
Language(s):
 Dates: 2019
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: -
 Degree: -

Event

show

Legal Case

show

Project information

show

Source 1

show
hide
Title: Astronomy and Astrophysics
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: -
Pages: - Volume / Issue: 624 Sequence Number: - Start / End Page: - Identifier: -