A representative sample of Be stars

Free access article

Issue		A&A Volume 369, Number 1, April I 2001


Page(s)		99 - 107
Section		Formation, structure and evolution of stars
DOI		http://dx.doi.org/10.1051/0004-6361:20010031

A&A 369, 99-107 (2001)
DOI: 10.1051/0004-6361:20010031

IV. Infrared photometry and the continuum excess

Lee Howells, I. A. Steele, John M. Porter and J. Etherton

Astrophysics Research Institute, Liverpool John Moores University, Egerton Wharf, Birkenhead CH41 1LD, UK

(Received 1 September 2000 / Accepted 22 December 2000)

Abstract
We present infra-red (JHK) photometry of 52 isolated Be stars of spectral types O9-B9 and luminosity classes III-V. We describe a new method of reduction, enabling separation of interstellar reddening and circumstellar excess. Using this technique we find that the disc emission makes a maximum contribution to the optical (B-V) colour of a few tenths of a magnitude. We find strong correlations between a range of emission lines (H $\alpha$ , Br $\gamma$ , Br11, and Br18) from the Be stars' discs, and the circumstellar continuum excesses. We also find that stellar rotation and disc excess are correlated.

Key words: stars: emission-line, Be -- circumstellar matter -- stars: rotation -- techniques: photometric -- methods: data analysis

Offprint request: Lee Howells, lxh@astro.livjm.ac.uk

SIMBAD Objects

What is OpenURL?

The OpenURL standard is a protocol for transmission of metadata describing the resource that you wish to access. An OpenURL link contains article metadata and directs it to the OpenURL server of your choice. The OpenURL server can provide access to the resource and also offer complementary services (specific search engine, export of references...). The OpenURL link can be generated by different means.

If your librarian has set up your subscription with an OpenURL resolver, OpenURL links appear automatically on the abstract pages.
You can define your own OpenURL resolver with your EDPS Account. In this case your choice will be given priority over that of your library.
You can use an add-on for your browser (Firefox or I.E.) to display OpenURL links on a page (see http://www.openly.com/openurlref/). You should disable this module if you wish to use the OpenURL server that you or your library have defined.