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Issue A&A
Volume 393, Number 1, October I 2002
Page(s) 195 - 204
Section Formation, structure and evolution of stars
DOI http://dx.doi.org/10.1051/0004-6361:20020974



A&A 393, 195-204 (2002)
DOI: 10.1051/0004-6361:20020974

Pre-main-sequence stars in the young open cluster NGC 1893

I. A spectroscopic search for candidates in the area photometrically surveyed
A. Marco1 and I. Negueruela2

1  Dpto. de Física, Ingeniería de Sistemas y Teoría de la Señal, Universidad de Alicante, Apdo. de Correos 99, 03080, Alicante, Spain
2  Observatoire de Strasbourg, 11 rue de l'Université, 67000 Strasbourg, France

(Received 6 February 2002 / Accepted 28 June 2002 )

Abstract
We present low-resolution spectroscopy of the majority of the stars in the field of NGC 1893 which were classified as non-members based on the photometry of Marco et al. (2001). We separate field stars from pre-main-sequence members based on a combination of spectral type and photometric indices which allows us to determine the reddening to the objects. For candidates to pre-main-sequence objects, we present intermediate-resolution spectra. We confirm 3 F-type emission-line objects as massive T Tauri stars in NGC 1893 and find two good candidates for being absorption-line Herbig A stars. A B5 star is a very good candidate for an absorption-line Herbig B star. We also investigate the nature of emission-line B-type stars close to the cluster centre. Available evidence suggests that both classical Be stars and Herbig Be stars are present in NGC 1893 .


Key words: open clusters and associations: individual: NGC 1893 -- stars: pre-main sequence -- stars: emission line, Be -- stars: early-type

Offprint request: A. Marco, amparo@astronomia.disc.ua.es

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© ESO 2002


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