SIMBAD references

1999A&AS..139...29G - Astron. Astrophys., Suppl. Ser., 139, 29-41 (1999/October-1)

Empirical calibration of the λ4000 A break.

GORGAS J., CARDIEL N., PEDRAZ S. and GONZALEZ J.J.

Abstract (from CDS):

Empirical fitting functions, describing the behaviour of the λ4000 Å break, D4000, in terms of effective temperature, metallicity and surface gravity, are presented. For this purpose, the break has been measured in 392 stars from the Lick/IDS Library. We have followed a very detailed error treatment in the reduction and fitting procedures, allowing for a reliable estimation of the break uncertainties. This calibration can be easily incorporated into stellar population models to provide accurate predictions of the break amplitude for, relatively old, composite systems.

Abstract Copyright:

Journal keyword(s): stars: fundamental parameters - galaxies: stellar content - techniques: spectroscopic - stars: atmospheres

VizieR on-line data: <Available at CDS (J/A+AS/139/29): table1.dat>

Simbad objects: 404

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