| Issue |
A&A
Volume 369, Number 1, April I 2001
|
|
|---|---|---|
| Page(s) | 99 - 107 | |
| Section | Interstellar and circumstellar matter | |
| DOI | https://doi.org/10.1051/0004-6361:20010031 | |
| Published online | 15 April 2001 | |
A representative sample of Be stars
IV. Infrared photometry and the continuum excess
Astrophysics Research Institute, Liverpool John Moores University, Egerton Wharf, Birkenhead CH41 1LD, UK
Corresponding author: Lee Howells, lxh@astro.livjm.ac.uk
Received:
1
September
2000
Accepted:
22
December
2000
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 
colour of a few tenths of a magnitude. We find strong correlations between a range of emission lines (Hα, Brγ, 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
© ESO, 2001
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