EDP Sciences
Free access
Issue
A&A
Volume 366, Number 3, February II 2001
Page(s) 817 - 826
Section Stellar clusters and associations
DOI http://dx.doi.org/10.1051/0004-6361:20000237


A&A 366, 817-826 (2001)
DOI: 10.1051/0004-6361:20000237

A search for peculiar objects in young open clusters

I. New emission line and late spectral type stars in NGC 6871
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 17 November 1999 / Accepted 9 November 2000 )

Abstract
We present the first results of a search in young open clusters for stars of very high initial mass, carried out by means of slitless spectroscopy. A deep ($R\simeq17$) survey of the open cluster NGC 6871 reveals many new objects of late spectral type, including an S star, as well as three new emission line stars, which are classified as Be stars. The already known Be star HD 227733 is surrounded by a previously undetected reflection nebula. The star VES 145, classified as an emission line object, is actually a late-type star, without any emission feature. We argue that VES 145 is a young RSG of a very high mass ( $M_0\simeq 25 M_{\odot}$) and a cluster member.


Key words: stars: early types -- stars: emission-line, Be -- stars: evolution -- stars: individual (HD 227733, VES 145) -- stars: late-type

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

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© ESO 2001