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Issue A&A
Volume 371, Number 1, May III 2001
Page(s) 123 - 132
Section Stellar clusters and associations
DOI http://dx.doi.org/10.1051/0004-6361:20010351



A&A 371, 123-132 (2001)
DOI: 10.1051/0004-6361:20010351

A search for peculiar objects in young open clusters

II. A new Be star, the optical counterpart of IRAS 19564+3224 and a new open cluster in Vulpecula
S. Bernabei1, 2 and V. F. Polcaro3

1  Osservatorio Astronomico di Bologna, Via Ranzani 1, 40127 Bologna, Italy
2  Dipartimento de Astrofísica, Universidad de La Laguna, Avda. Astrofisico F. Sánchez sn, 30071 La Laguna, Spain
3  Istituto di Astrofisica Spaziale, CNR, Area della Ricerca di Roma Tor Vergata, V. Fosso del Cavaliere snc, 00133 Roma, Italy

(Received 24 November 2000 / Accepted 28 February 2001 )

Abstract
A serendipitous sky field in Vulpecula was observed with Johnson BVR photometry and slitless spectroscopy in the 5600-8000 Årange, looking for emission line and late spectral type stars. We discovered that the B2V star LS II +32$^{\circ}$ 9, most probably a member of the Vul OB4 association, is now an H$\alpha$ emitter. Furthermore, we identified the optical counterpart of the IRAS source IRAS 19564+3224 as a C star. Photometric study of the surrounding stellar field revealed that this object lies inside the sky area of a previously undetected open cluster of intermediate age. We discuss the possible cluster membership of the Carbon star and its implications. Some hints about the galactic structure along the line of sight of the observed field are also given


Key words: stars: carbon stars -- stars: evolution -- stars: emission-line, Be -- stars: individual (LS II+32$^{\circ}$ 9) open clusters and associations

Offprint request: V. F. Polcaro, polcaro@saturn.ias.fra.cnr.it

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© ESO 2001


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