The Open UniversitySkip to content

A representative sample of Be stars. II. K band spectroscopy

Clark, J. S. and Steele, I. A. (2000). A representative sample of Be stars. II. K band spectroscopy. Astronomy and Astrophysics Supplement Series, 141(1) pp. 65–77.

Full text available as:
PDF (Version of Record) - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader
Download (434kB)
DOI (Digital Object Identifier) Link:
Google Scholar: Look up in Google Scholar


We present K band (2.05 μm - 2.22 μm) spectra of 66 isolated Be stars of spectral types O9-B9 and luminosity classes III, IV & V. We find that objects with He I features either in emission or absorption are B3 or earlier. Objects with Mg II emission but no He I are B2 to B4, while objects with Brγ emission but no evidence of He I or Mg II are B5 or later. Na I emission in the spectra of 4 objects appears to indicate that regions of the circumstellar envelopes of these stars must be shielded from direct stellar radiation. Systematic trends in the line strength and profile of Brγ are seen from early to late spectral types which can be understood in terms of differences in the disc temperature and density. 30 per-cent of the stars do not currently show evidence for line emission. Compared to the emission line stars these objects have a significantly lower mean rotational velocity and a distribution of spectral types that is significantly earlier. This can be explained either as the original misidentification of these objects as Be stars (i.e. they never had line emission), or as evidence that stars with lower rotational velocities may be more prone to changes between the Be and B phases.

Item Type: Journal Item
Copyright Holders: 2000 ESO
ISSN: 1286-4846
Keywords: stars; emission-line stars; Be stars; infrared stars
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Related URLs:
Item ID: 14919
Depositing User: Astrid Peterkin
Date Deposited: 19 Feb 2009 12:02
Last Modified: 09 Dec 2018 22:06
Share this page:


Altmetrics from Altmetric

Citations from Dimensions

Download history for this item

These details should be considered as only a guide to the number of downloads performed manually. Algorithmic methods have been applied in an attempt to remove automated downloads from the displayed statistics but no guarantee can be made as to the accuracy of the figures.

Actions (login may be required)

Policies | Disclaimer

© The Open University   contact the OU