Pre-main-sequence stars in the young open cluster NGC 1893. I. A spectroscopic search for candidates in the area photometrically surveyed

Details Pre-main-sequence stars in the young open cluster NGC 1893. I. A spectroscopic search for candidates in the area photometrically surveyed Pre-main-sequence stars in the young open cluster NGC 1893. I. A spectroscopic search for candidates in the area photometrically surveyed

Oct 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002a%26a...393..195m&link_type=abstract

Astronomy and Astrophysics, v.393, p.195-204 (2002)

Astronomy and Astrophysics

Astrophysics

13

Open Clusters And Associations: Individual: Ngc 1893, Stars: Pre-Main Sequence, Stars: Emission Line, Be Stars: Early-Type

Scientific paper

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. Based on observations obtained at the Asiago Observatory (Italy), the Isaac Newton Telescope (La Palma, Spain) and Observatoire de Haute Provence (CNRS, France).

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