An abundance calibration for DDO photometry of Population IIG and K giants

Juan J. Clariá; Dante Minniti; Andrés E. Piatti; Emilio Lapasset

doi:10.1093/mnras/268.3.733

An abundance calibration for DDO photometry of Population IIG and K giants

Juan J. Clariá, Dante Minniti, Andrés E. Piatti, Emilio Lapasset

Resultado de la investigación: Contribución a una revista › Artículo › revisión exhaustiva

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Resumen

New photometry with the four primary filters of the DDO system is presented for a sample of metal-poor giants with abundances determined from high-dispersion spectroscopy. In addition, DDO photometry of very metal-deficient stars with photometric abundances is also given. These data, combined with published DDO photometry of field and globular cluster stars, are used to establish an abundance calibration for Population II giants. A new DDO index δ4548 is presented, which correlates very well with [Fe/H], even for extremely metal-poor red giants ([Fe/H] = - 3.0). The present abundance calibration represents an improvement over previous ones, because it exhibits less scatter and a more extended range towards lower abundances. Iso-abundance lines have been determined in the C₀(45-48) versus C₀(42-45) diagram and a new procedure for determining abundances of Population II giants is described. Finally, the DDO abundance scale established here for globular clusters is in good agreement with that of Zinn.

Idioma original	Inglés
Páginas (desde-hasta)	733-741
Número de páginas	9
Publicación	Monthly Notices of the Royal Astronomical Society
Volumen	268
N.º	3
DOI	https://doi.org/10.1093/mnras/268.3.733
Estado	Publicada - 1 ene. 1994
Publicado de forma externa	Sí

Áreas temáticas de ASJC Scopus

Astronomía y astrofísica
Ciencias planetarias y espacial

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10.1093/mnras/268.3.733

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@article{2ec83a83a6854e27a418ebbe37f03598,

title = "An abundance calibration for DDO photometry of Population IIG and K giants",

abstract = "New photometry with the four primary filters of the DDO system is presented for a sample of metal-poor giants with abundances determined from high-dispersion spectroscopy. In addition, DDO photometry of very metal-deficient stars with photometric abundances is also given. These data, combined with published DDO photometry of field and globular cluster stars, are used to establish an abundance calibration for Population II giants. A new DDO index δ4548 is presented, which correlates very well with [Fe/H], even for extremely metal-poor red giants ([Fe/H] = - 3.0). The present abundance calibration represents an improvement over previous ones, because it exhibits less scatter and a more extended range towards lower abundances. Iso-abundance lines have been determined in the C0(45-48) versus C0(42-45) diagram and a new procedure for determining abundances of Population II giants is described. Finally, the DDO abundance scale established here for globular clusters is in good agreement with that of Zinn.",

keywords = "Stars: abundances, Stars: giant, Stars: late-type, Stars: Population II, Techniques: photometric",

author = "Clari{\'a}, {Juan J.} and Dante Minniti and Piatti, {Andr{\'e}s E.} and Emilio Lapasset",

note = "Funding Information: We thank the CTIO telescope Allocation Committee and staff members, night assistants and visitors' support of CTIO for their first-class support. Thanks are also due to Dr R. Garrison for allotting observing time at the University of Toronto Las Campanas Observatory. We are very grateful to Dr W. Osborn and the referee whose valuable comments and suggestions helped us to improve the manuscript. Finally, the assistance of M. A. Bosio in the data reduction and of J. E. Laborde in the preparation of the figures is acknowledged. This research was supported by funds provided through the Argentine institutions CONICET and CONICOR.",

year = "1994",

month = jan,

day = "1",

doi = "10.1093/mnras/268.3.733",

language = "English",

volume = "268",

pages = "733--741",

journal = "Monthly Notices of the Royal Astronomical Society",

issn = "0035-8711",

publisher = "Oxford University Press",

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TY - JOUR

T1 - An abundance calibration for DDO photometry of Population IIG and K giants

AU - Clariá, Juan J.

AU - Minniti, Dante

AU - Piatti, Andrés E.

AU - Lapasset, Emilio

N1 - Funding Information: We thank the CTIO telescope Allocation Committee and staff members, night assistants and visitors' support of CTIO for their first-class support. Thanks are also due to Dr R. Garrison for allotting observing time at the University of Toronto Las Campanas Observatory. We are very grateful to Dr W. Osborn and the referee whose valuable comments and suggestions helped us to improve the manuscript. Finally, the assistance of M. A. Bosio in the data reduction and of J. E. Laborde in the preparation of the figures is acknowledged. This research was supported by funds provided through the Argentine institutions CONICET and CONICOR.

PY - 1994/1/1

Y1 - 1994/1/1

N2 - New photometry with the four primary filters of the DDO system is presented for a sample of metal-poor giants with abundances determined from high-dispersion spectroscopy. In addition, DDO photometry of very metal-deficient stars with photometric abundances is also given. These data, combined with published DDO photometry of field and globular cluster stars, are used to establish an abundance calibration for Population II giants. A new DDO index δ4548 is presented, which correlates very well with [Fe/H], even for extremely metal-poor red giants ([Fe/H] = - 3.0). The present abundance calibration represents an improvement over previous ones, because it exhibits less scatter and a more extended range towards lower abundances. Iso-abundance lines have been determined in the C0(45-48) versus C0(42-45) diagram and a new procedure for determining abundances of Population II giants is described. Finally, the DDO abundance scale established here for globular clusters is in good agreement with that of Zinn.

AB - New photometry with the four primary filters of the DDO system is presented for a sample of metal-poor giants with abundances determined from high-dispersion spectroscopy. In addition, DDO photometry of very metal-deficient stars with photometric abundances is also given. These data, combined with published DDO photometry of field and globular cluster stars, are used to establish an abundance calibration for Population II giants. A new DDO index δ4548 is presented, which correlates very well with [Fe/H], even for extremely metal-poor red giants ([Fe/H] = - 3.0). The present abundance calibration represents an improvement over previous ones, because it exhibits less scatter and a more extended range towards lower abundances. Iso-abundance lines have been determined in the C0(45-48) versus C0(42-45) diagram and a new procedure for determining abundances of Population II giants is described. Finally, the DDO abundance scale established here for globular clusters is in good agreement with that of Zinn.

KW - Stars: abundances

KW - Stars: giant

KW - Stars: late-type

KW - Stars: Population II

KW - Techniques: photometric

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DO - 10.1093/mnras/268.3.733

M3 - Article

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SN - 0035-8711

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JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

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An abundance calibration for DDO photometry of Population IIG and K giants

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