SIMBAD references

1999A&AS..140..135B - Astron. Astrophys., Suppl. Ser., 140, 135-143 (1999/December-1)

Stroemgren photometry of the open clusters NGC 6134 and. NGC 3680.

BRUNTT H., FRANDSEN S., KJELDSEN H. and ANDERSEN M.I.

Abstract (from CDS):

We present Stroemgren photometry of the two southern open clusters NGC 6134 and NGC 3680. The field of NGC 6134 was observed with different shifts of the telescope and rotations of the CCD camera in order to detect and remove any large scale flat field errors using the technique described by Andersen et al. (1995, Eso Conf. & Work. Proc., 53, 87). By using calibrations of the Stroemgren indices we find the metallicity and interstellar reddening of the clusters: For NGC 6134 the results are [Fe/H]=0.28±0.02 and E(b-y)=0.263±0.004 and for NGC 3680 we find [Fe/H]=0.09±0.02 and E(b-y)=0.048±0.011. When comparing the observed colour-magnitude diagrams theoretical isochrones we find that models which include overshooting in the convective cores agree with the extended hook after the turnoff. From the isochrone fit we find ages of 0.69±0.10Gyr and 1.45±0.15Gyr for NGC 6134 and NGC 3680 respectively. Stroemgren photometry of six known δ Scuti stars in NGC 6134 is presented.

Abstract Copyright:

Journal keyword(s): techniques: photometric - open clusters and associations: individual: NGC 6134, NGC 3680 - δ Sct

VizieR on-line data: <Available at CDS (J/A+AS/140/135): ngc6134* ngc3680*>

Nomenclature: Table NGC 3680, col(1): Cl* NGC 3680 BFK NNN N=169 among (Nos 2-269). Table NGC 6134, col(1): Cl* NGC 6134 BFK NNNN N=606 among (Nos 4-1518). Table NGC 6134, col(2): Cl* NGC 6134 FBV NNN N=100 added.

CDS comments: Table NGC 3680, col(2): Cl* NGC 3680 NAA NNNN.

Simbad objects: 773

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