uu.seUppsala University Publications
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Basic parameters and properties of the rapidly rotating magnetic helium-strong B star HR 7355
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
Show others and affiliations
2013 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 429, no 1, 177-188 p.Article in journal (Refereed) Published
Abstract [en]

The spectral and magnetic properties and variability of the B2Vnp emission-line magnetosphere star HR 7355 were analysed. The object rotates at almost 90 per cent of the critical value, meaning it is a magnetic star for which oblateness and gravity darkening effects cannot be ignored any longer. A detailed modelling of the photospheric parameters indicates that the star is significantly cooler than suggested by the B2 spectral type, with T-eff = 17 500 K atypically cool for a star with a helium-enriched surface. The spectroscopic variability of helium and metal lines due to the photospheric abundance pattern is far more complex than a largely dipolar, oblique magnetic field of about 11-12 kG may suggest. Doppler imaging shows that globally the most He-enriched areas coincide with the magnetic poles and metal-enriched areas with the magnetic equator. While most of the stellar surface is helium enriched with respect to the solar value, some isolated patches are depleted. The stellar wind in the circumstellar environment is governed by the magnetic field, i. e. the stellar magnetosphere is rigidly corotating with the star. The magnetosphere of HR 7355 is similar to the well known sigma Ori E: the gas trapped in the magnetospheric clouds is fairly dense, and at the limit to being optically thick in the hydrogen emission. Apart from a different magnetic obliquity, HR 7355 and the more recently identified HR 5907 have virtually identical stellar and magnetic parameters.

Place, publisher, year, edition, pages
2013. Vol. 429, no 1, 177-188 p.
Keyword [en]
stars: chemically peculiar, stars: early-type, stars: individual: HR 7355, stars: magnetic field
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:uu:diva-201882DOI: 10.1093/mnras/sts323ISI: 000318238300038OAI: oai:DiVA.org:uu-201882DiVA: diva2:630068
Available from: 2013-06-18 Created: 2013-06-17 Last updated: 2017-12-06Bibliographically approved

Open Access in DiVA

fulltext(9048 kB)103 downloads
File information
File name FULLTEXT01.pdfFile size 9048 kBChecksum SHA-512
32d8ecdfad0927d7c26fd3aa8e6fdc1121d389a4dbd41f838d3e19e9a3aea6c31729e2b802c6033d17c2889397f360feafb8fac2be6d59ae27284b3eb91b86e5
Type fulltextMimetype application/pdf

Other links

Publisher's full text

Authority records BETA

Kochukhov, Oleg

Search in DiVA

By author/editor
Kochukhov, Oleg
By organisation
Department of Physics and Astronomy
In the same journal
Monthly notices of the Royal Astronomical Society
Natural Sciences

Search outside of DiVA

GoogleGoogle Scholar
Total: 103 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 384 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf