Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-11-25
Mon.Not.Roy.Astron.Soc.367:1441-1449,2006
Astronomy and Astrophysics
Astrophysics
10 paginas, 11 eps figures, accepted for publication in MNRAS
Scientific paper
10.1111/j.1365-2966.2006.09985.x
Based on a deep optical CCD (UBV(RI)_C) photometric survey and on the Two-Micron All-Sky-Survey (2MASS) data we derived the main parameters of the open cluster NGC 2401. We found this cluster is placed at 6.3 $\pm$ 0.5 kpc (V_O - M_V = 14.0 \pm 0.2) from the Sun and is 25 Myr old, what allows us to identify NGC 2401 as a member of the young population belonging to the innermost side of the extension of the Norma-Cygnus spiral--arm in the Third Galactic Quadrant. A spectroscopic study of the emission star LSS 440 that lies in the cluster area revealed it is a B0Ve star; however, we could not confirm it is a cluster member. We also constructed the cluster luminosity function (LF) down to $V \sim 22$ and the cluster initial mass function (IMF) for all stars with masses above $M \sim 1-2 M_{\sun}$. It was found that the slope of the cluster IMF is $x \approx 1.8 \pm 0.2$. The presence of a probable PMS star population associated to the cluster is weakly revealed.
Baume Gustavo
Carraro Giovanni
Moitinho Andre
Solivella Gladys
Vazquez Ruben
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