Photometric and spectroscopic study of the young open cluster NGC 1893

Details Photometric and spectroscopic study of the young open cluster NGC 1893 Photometric and spectroscopic study of the young open cluster NGC 1893

2001-01-19

arxiv.org/abs/astro-ph/0101348v1

Astronomy and Astrophysics

Astrophysics

Accepted for publication in the Astronomical Journal. 55 pages, 11 figures. Uses aastex

Scientific paper

10.1086/319950

We present uvby-beta CCD photometry of the field of the open cluster NGC 1893. Our photometry is deep enough to cover the complete main sequence B spectral type. We identify ~50 very likely members of the cluster down to spectral type B9-A0, some of which have much higher reddenings than the average. We derive a color excess E(b-y) = 0.33+-0.03 and a dereddened distance modulus V_0 - M_V = 13.9+-0.2. From the beta index, we identify several candidates as emission-line stars, for which we have obtained spectroscopy. Three of them display spectra corresponding to spectral type F, but showing H-alpha in emission. Photometric measurements in this and previous studies indicate strong variability. These characteristics show them to be pre-main-sequence stars of spectral type F. We also identify two likely Herbig Be stars. These results hint at the existence of a sizable pre-main-sequence population in NGC 1893.

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