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Hγ and Hδ Absorption Features in Stars and Stellar Populations

Worthey, Guy, Ottaviani, D. L.·1997·The Astrophysical Journal Supplement Series

Abstract

The Hγ and Hδ absorption features are measured in a sample of 455 (out of an original 460) Lick/IDS stars with pseudo-equivalent width indices. For each Balmer feature, two definitions, involving a narrow (~20 A) and a wide (~40 A) central bandpass, are measured. These four new Balmer indices augment 21 indices previously determined by Worthey et al., and polynomial fitting functions that give index strengths as a function of stellar temperature, gravity, and [Fe/H] are provided. The new indices are folded into models for the integrated light of stellar populations, and predictions are given for single-burst stellar populations of a variety of ages and metallicities. Contrary to our initial hopes, the indices cannot break a degeneracy between burst age and burst strength in post-starburst objects, but they are successful mean-age indicators when used with sensitive metallicity indicators. An appendix gives data, advice, and examples of how to transform new spectra to the 25-index Lick/IDS system.

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Metadata

Authors
Worthey, G., & Ottaviani, D. L.
Venue
The Astrophysical Journal Supplement Series
Published
1997-08
Volume
111
Issue
2
Pages
377-386
ISSN
  • 0067-0049 (ISSN-L)
  • 1538-4365
OpenAlex
W2017524870
Cited by
833
References
16
FWCI
9.87
Type
journal article
Language
en
Open access
closed

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CoChat. (2026). Citation check: Hγ and Hδ Absorption Features in Stars and Stellar Populations. https://app.cochat.ai/papers/10.1086/313021
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Worthey, G., & Ottaviani, D. L. (1997). Hγ and Hδ Absorption Features in Stars and Stellar Populations. The Astrophysical Journal Supplement Series. https://doi.org/10.1086/313021

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