| | |
| | |
Stat |
Members: 3645 Articles: 2'501'711 Articles rated: 2609
20 April 2024 |
|
| | | |
|
Article overview
| |
|
The Identification of Blue Horizontal Branch Stars in the Integrated Spectra of Globular Clusters | Ricardo P. Schiavon
; James A. Rose
; Stephane Courteau & Lauren MacArthur
; | Date: |
29 Apr 2004 | Journal: | Astrophys.J. 608 (2004) L33-L36 | Subject: | astro-ph | Affiliation: | University of Virginia), James A. Rose (University of North Carolina), Stephane Courteau (Queens University) & Lauren MacArthur (University of British Columbia | Abstract: | A major uncertainty in the spectroscopic dating of extragalactic globular clusters concerns the degenerate effect that age and horizontal branch morphology have on the strength of Balmer lines. In this Letter we show that the ratio between the equivalent widths of Hdelta and Hbeta is far more sensitive to horizontal branch morphology than to age, thus making it possible to break the degeneracy. We show that it is possible to distinguish intermediate-age globular clusters from those whose Balmer lines are strengthened by the presence of blue horizontal branch stars, purely on the basis of the clusters’ integrated spectra. The degeneracy between age and horizontal branch morphology can be lifted with Hbeta and Hdelta line strengths from spectra with S/N >= 30 per Angstrom, which is typical of current studies of integrated spectroscopy of extragalactic globular clusters. | Source: | arXiv, astro-ph/0404592 | Services: | Forum | Review | PDF | Favorites |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
|
| |
|
|
|
| News, job offers and information for researchers and scientists:
| |