2009MNRAS.392..691C


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.18CEST11:46:09

2009MNRAS.392..691C - Mon. Not. R. Astron. Soc., 392, 691-704 (2009/January-2)

An optimized Hβ index for disentangling stellar population ages.

CERVANTES J.L. and VAZDEKIS A.

Abstract (from CDS):

We have defined a new Hβ absorption index definition, Hβo, which has been optimized as an age indicator for old and intermediate age stellar populations. Rather than using stellar spectra, we employed for this purpose a library of stellar population spectral energy distributions of different ages and metallicities at moderately high resolution. Hβo provides us with improved abilities for lifting the age-metallicity degeneracy affecting the standard Hβ Lick index definition. The new index, which has also been optimized against photon noise and velocity dispersion, is fully characterized with wavelength shift, spectrum shape, dust extinction and [α/Fe] abundance ratio effects. Hβo requires spectra of similar qualities as those commonly used for measuring the standard Hβ Lick index definition. Aiming at illustrating the use and capabilities of Hβo as an age indicator we apply it to Milky Way globular clusters and to a well selected sample of early-type galaxies covering a wide range in mass. The results shown here are particularly useful for applying this index and understand the involved uncertainties.

Abstract Copyright: © 2008 The Authors. Journal compilation © 2008 RAS

Journal keyword(s): globular clusters: general - galaxies: abundances - galaxies: elliptical and lenticular, cD - galaxies: stellar content

Simbad objects: 7

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Number of rows : 7

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 M 32 IG 00 42 41.825 +40 51 54.61 9.51 9.03 8.08     ~ 2038 2
2 NGC 4365 GiG 12 24 28.228 +07 19 03.07   11.5       ~ 806 0
3 NGC 4387 GiG 12 25 41.6768872639 +12 48 37.809497625 13.42 13.01 12.12   10.87 ~ 374 1
4 NGC 4464 GiG 12 29 21.313 +08 09 23.63   13.5       ~ 219 0
5 NGC 4473 GiG 12 29 48.878 +13 25 45.55 11.60 11.16 10.20     ~ 612 1
6 NGC 4478 GiP 12 30 17.439 +12 19 42.88 12.82 12.36 11.45   10.17 ~ 474 1
7 M 59 GiG 12 42 02.322 +11 38 48.95   11.0       ~ 667 0

    Equat.    Gal    SGal    Ecl

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2021.04.18-11:46:09

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