EDP Sciences
Free access
Volume 405, Number 2, July II 2003
Page(s) 585 - 590
Section Formation, structure and evolution of stars
DOI http://dx.doi.org/10.1051/0004-6361:20030599

A&A 405, 585-590 (2003)
DOI: 10.1051/0004-6361:20030599

Interstellar extinction in the direction of the Aquila Rift

V. Straizys1, K. Cernis1 and S. Bartasiute1, 2

1  Institute of Theoretical Physics and Astronomy, Vilnius University, Gostauto 12, Vilnius 2600, Lithuania
    e-mail: cernis@itpa.lt
2  Astronomical Observatory of Vilnius University, Ciurlionio 29, Vilnius 2009, Lithuania
    e-mail: stanislava.bartasiute@ff.vu.lt

(Received 28 February 2003 / Accepted 14 April 2003)

The distance dependence of interstellar extinction in the direction of the Aquila Rift is investigated using 473 stars observed in the Vilnius photometric system. The front edge of the dark clouds in the area is found to be at  $225\pm55$ pc and the thickness of the cloud system is about 80 pc. The maximum extinction  AV in the clouds is close to 3.0 mag. Two stars with larger extinction are found and discussed. Since the new distance of the clouds is larger than the previously accepted distance, the cloud system mass should be increased to  $2.7\times10^5~M_{\odot}$ which is close to the virial mass estimated from the CO velocity dispersion. Additional arguments are given in favor of the genetic relation between the Serpens and the Scorpio-Ophiuchus dark clouds.

Key words: stars: fundamental parameters -- ISM: dust, extinction -- ISM: clouds -- ISM: individual objects: Aquila Rift -- ISM: individual objects: Serpens molecular cloud

Offprint request: V. Straizys, straizys@itpa.lt

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