SIMBAD references

2006AJ....131..461A - Astron. J., 131, 461-472 (2006/January-0)

vbyCaHβ CCD photometry of clusters. VI. The metal-deficient open cluster NGC 2420.

ANTHONY-TWAROG B.J., TANNER D., CRACRAFT M. and TWAROG B.A.

Abstract (from CDS):

CCD photometry on the intermediate-band vbyCaHβ system is presented for the metal-deficient open cluster NGC 2420. Restricting the data to probable single members of the cluster using the CMD and the photometric indices alone generates a sample of 106 stars at the cluster turnoff. The average E(b-y)=0.035±0.003 (s.e.m.) or E(B-V)=0.050±0.004 (s.e.m.), where the errors refer to internal errors alone. With this reddening, [Fe/H] is derived from both m1 and hk, using b-y and Hβ as the temperature index. The agreement among the four approaches is reasonable, leading to a final weighted average of [Fe/H]=-0.37±0.05 (s.e.m.) for the cluster, on a scale where the Hyades has [Fe/H]=+0.12. When combined with the abundances from DDO photometry and from recalibrated low-resolution spectroscopy, the mean metallicity becomes [Fe/H]=-0.32±0.03. It is also demonstrated that the average cluster abundances based on either DDO data or low-resolution spectroscopy are consistently reliable to 0.05 dex or better, contrary to published attempts to establish an open cluster metallicity scale using simplistic offset corrections among different surveys.

Abstract Copyright:

Journal keyword(s): Galaxy: Open Clusters and Associations: Individual: NGC Number: NGC 2420 - Techniques: Photometric

VizieR on-line data: <Available at CDS (J/AJ/131/461): table1.dat>

Nomenclature: Table 1: Cl* NGC 2420 ATC NNNN N=531 among (Nos 82-6447).

Status at CDS:   could be processed
// All or part of tables of objects could be ingested in SIMBAD with priority 2.

Simbad objects: 13

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