Impact of the low solar abundance on the ages of globular clusters

Research output: Contribution to journalArticle

Abstract

We present the result of our investigation on the impact of the low Solar abundance of Asplund and collaborators (2004) on the derived ages for the oldest star clusters based on isochrone fittings. We have constructed new stellar models and corresponding isochrones using this new solar mixture with a proper Solar calibration. We have found that the use of the Asplund et al. (2004) metallicity causes the typical ages for old globular clusters in the Milky Way to be increased roughly by 10%. Although this may appear small, it has a significant impact on the interpretation for the formation epoch of Milky Way globular clusters. The Asplund et al. (2004) abundance may not necessarily threaten the current concordance cosmology but would suggest that Milky Way globular clusters formed before the reionization epoch and before the main galaxy body starts to build up. This is in contrast to the current understanding on the galaxy formation.

Original languageEnglish
Pages (from-to)135-139
Number of pages5
JournalJournal of the Korean Astronomical Society
Volume43
Issue number4
DOIs
Publication statusPublished - 2010 Aug 1

Fingerprint

globular clusters
cosmology
time measurement
stellar models
star clusters
galactic evolution
calibration
metallicity
galaxies
causes

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

@article{2304f8ef7a47459d8c17f9fd96b59f51,
title = "Impact of the low solar abundance on the ages of globular clusters",
abstract = "We present the result of our investigation on the impact of the low Solar abundance of Asplund and collaborators (2004) on the derived ages for the oldest star clusters based on isochrone fittings. We have constructed new stellar models and corresponding isochrones using this new solar mixture with a proper Solar calibration. We have found that the use of the Asplund et al. (2004) metallicity causes the typical ages for old globular clusters in the Milky Way to be increased roughly by 10{\%}. Although this may appear small, it has a significant impact on the interpretation for the formation epoch of Milky Way globular clusters. The Asplund et al. (2004) abundance may not necessarily threaten the current concordance cosmology but would suggest that Milky Way globular clusters formed before the reionization epoch and before the main galaxy body starts to build up. This is in contrast to the current understanding on the galaxy formation.",
author = "Yi, {Sukyoung K.} and Kim, {Yong Cheol}",
year = "2010",
month = "8",
day = "1",
doi = "10.5303/JKAS.2010.43.4.135",
language = "English",
volume = "43",
pages = "135--139",
journal = "Journal of the Korean Astronomical Society",
issn = "1225-4614",
publisher = "Korean Astronomical Society",
number = "4",

}

Impact of the low solar abundance on the ages of globular clusters. / Yi, Sukyoung K.; Kim, Yong Cheol.

In: Journal of the Korean Astronomical Society, Vol. 43, No. 4, 01.08.2010, p. 135-139.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Impact of the low solar abundance on the ages of globular clusters

AU - Yi, Sukyoung K.

AU - Kim, Yong Cheol

PY - 2010/8/1

Y1 - 2010/8/1

N2 - We present the result of our investigation on the impact of the low Solar abundance of Asplund and collaborators (2004) on the derived ages for the oldest star clusters based on isochrone fittings. We have constructed new stellar models and corresponding isochrones using this new solar mixture with a proper Solar calibration. We have found that the use of the Asplund et al. (2004) metallicity causes the typical ages for old globular clusters in the Milky Way to be increased roughly by 10%. Although this may appear small, it has a significant impact on the interpretation for the formation epoch of Milky Way globular clusters. The Asplund et al. (2004) abundance may not necessarily threaten the current concordance cosmology but would suggest that Milky Way globular clusters formed before the reionization epoch and before the main galaxy body starts to build up. This is in contrast to the current understanding on the galaxy formation.

AB - We present the result of our investigation on the impact of the low Solar abundance of Asplund and collaborators (2004) on the derived ages for the oldest star clusters based on isochrone fittings. We have constructed new stellar models and corresponding isochrones using this new solar mixture with a proper Solar calibration. We have found that the use of the Asplund et al. (2004) metallicity causes the typical ages for old globular clusters in the Milky Way to be increased roughly by 10%. Although this may appear small, it has a significant impact on the interpretation for the formation epoch of Milky Way globular clusters. The Asplund et al. (2004) abundance may not necessarily threaten the current concordance cosmology but would suggest that Milky Way globular clusters formed before the reionization epoch and before the main galaxy body starts to build up. This is in contrast to the current understanding on the galaxy formation.

UR - http://www.scopus.com/inward/record.url?scp=78149312274&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=78149312274&partnerID=8YFLogxK

U2 - 10.5303/JKAS.2010.43.4.135

DO - 10.5303/JKAS.2010.43.4.135

M3 - Article

AN - SCOPUS:78149312274

VL - 43

SP - 135

EP - 139

JO - Journal of the Korean Astronomical Society

JF - Journal of the Korean Astronomical Society

SN - 1225-4614

IS - 4

ER -