EDP Sciences
Free Access
Volume 372, Number 2, June III 2001
Page(s) 644 - 650
Section Diffuse matter in space
DOI https://doi.org/10.1051/0004-6361:20010496
Published online 15 June 2001

A&A 372, 644-650 (2001)
DOI: 10.1051/0004-6361:20010496

Determination of RV towards galactic O stars

P. Patriarchi1, L. Morbidelli1, M. Perinotto2 and G. Barbaro3

1  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

(Received 22 May 2000 / Accepted 2 April 2001)

We present new measurements of the interstellar reddening parameter RV=AV/E(B-V) 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. 1989). 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

Offprint request: P. Patriarchi, pat@arcetri.astro.it

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© ESO 2001

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