Volume 372, Number 2, June III 2001
|Page(s)||644 - 650|
|Published online||15 June 2001|
Determination of RV towards galactic O stars
CAISMI/CNR, Largo E. Fermi 5, 50125 Firenze, Italy
2 Dipartimento di Astronomia e Scienza dello Spazio, Universitá di Firenze, Largo E. Fermi 5, 50125 Firenze, Italy
3 Dipartimento di Astronomia, Universitá di Padova, Vicolo dell'Osservatorio 5, 35122 Padova, Italy
Corresponding author: P. Patriarchi, email@example.com
Accepted: 2 April 2001
We present new measurements of the interstellar reddening parameter towards 35 O stars. The results are combined with measurements from the literature for 60 stars to study the behaviour of RV with heliocentric distance. RV is the single basic parameter which characterizes the interstellar extinction from the near-infrared to the far-UV spectral region. The absolute extinction AV, from which RV is derived, is best determined by optical and near-infrared photometry (Cardelli et al. [CITE]). We consider important the derivation of RV with the same technique in the direction of as many as possible galactic O stars.
Key words: interstellar medium: dust, extinction
© ESO, 2001
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