SIMBAD references

1997A&AS..122....9S - Astron. Astrophys., Suppl. Ser., 122, 9-29 (1997/April-1)

Multicolour deep CCD photometric study of the moderately young southern open star clusters NGC 3228, NGC 4103, NGC 5662 and NGC 6087.

SAGAR R. and CANNON R.D.

Abstract (from CDS):

CCD observations in the U, B, V, R and I passbands have been used to generate colour-colour and deep colour-magnitude diagrams for the young open star clusters NGC 3228, NGC 4103, NGC 5662 and NGC 6087. The sample consists of about 2000 stars reaching down to V=20mag. The interstellar extinction across the face of the imaged cluster regions seems to be uniform with average values of E(B-V)=0.31, 0.34 and 0.22mag for NGC 4103, NGC 5662 and NGC 6087 respectively. The distances to the clusters NGC 3228, NGC 4103, NGC 5662 and NGC 6087 have been estimated as 0.5±0.05, 2.0±0.3, 0.8±0.1 and 1.0±0.1kpc respectively, while the corresponding ages estimated from the theoretical stellar evolutionary isochrones fitted to the bright proper motion cluster members are ∼100, 30, 80 and 65Myr respectively. Present data are consistent with the membership of the Cepheid variable V Cen to NGC 5662 and of S Norm to NGC 6087. Heavy contamination by foreground and background field stars has unfortunately made it impossible to reach definite conclusions about the faint luminosity function, and the data do not reach faint enough limits to investigate pre-main sequence stars.

Abstract Copyright:

Journal keyword(s): HR diagram - stars: evolution - open clusters and associations: individual: NGC 3228, NGC 4103, NGC 5662, NGC 6087

VizieR on-line data: <Available at CDS (J/A+AS/122/9): table6 table7 table8 table9a table9b>

Nomenclature: Table 6: Cl* NGC 3228 SC NNN (Nos 1-408). Table 7: Cl* NGC 4103 SC NNN (Nos 1-288). Table 8: Cl* NGC 5662 SC NNN (Nos 1-502). Table 9a: Cl* NGC 6087 SC a-NNN (Nos 1-418). Table 9b: Cl* NGC 6087 SC b-NNN (Nos 1-381)

Simbad objects: 2005

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