SIMBAD references

2002AJ....123..892P - Astron. J., 123, 892-904 (2002/February-0)

UBVI and Hα photometry of the young open cluster NGC 2244.

PARK B.-G. and SUNG H.

Abstract (from CDS):

New UBVI and Hα photometry has been performed for the young open cluster NGC 2244. We classified 30 OB stars as being members of the cluster using proper-motion data and spectral types from previous investigators, along with photometric diagrams obtained in this study. We measured Hα emission strength of the stars by Hα photometry and set up a selection criterion to select pre-main-sequence (PMS) stars with Hα emission. Fourteen PMS stars and seven PMS candidates were found using the criterion. In addition, six stars found near the positions of ROSAT HRI X-ray sources were assumed to be PMS stars and the optical counterparts of these X-ray sources. We determined a reddening of <E(B-V)>=0.47±0.04 for the cluster and a total-to-selective extinction ratio of RV=3.1±0.2. The distance modulus derived was V0-MV=11.1. By comparing our photometric results with theoretical evolution models, we derived a main-sequence turnoff age of 1.9 Myr and a PMS age spread of about 6 Myr. The slope of the initial mass function, Γ, calculated in the mass range 0.5≤logm≤2.0 could be flat (Γ=-0.7±0.1).

Abstract Copyright:

Journal keyword(s): open clusters and associations: individual (NGC 2244) - Stars: Pre-Main-Sequence

Nomenclature: Table 2: Cl* NGC 2244 PS NNN (Nos 1-577).

Simbad objects: 595

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