English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
  Spectroscopy and photometry of the least massive Type II globular clusters: NGC 1261 and NGC 6934

Marino, A. F., Milone, A. P., Renzini, A., Yong, D., Asplund, M., Costa, G. S. D., et al. (2021). Spectroscopy and photometry of the least massive Type II globular clusters: NGC 1261 and NGC 6934. The Astrophysical Journal, 923(1): 22. doi:10.3847/1538-4357/ac282c.

Item is

Basic

show hide
Genre: Journal Article

Files

show Files
hide Files
:
Spectroscopy and photometry of the least massive Type II globular clusters NGC 1261 and NGC 6934.pdf (Any fulltext), 2MB
 
File Permalink:
-
Name:
Spectroscopy and photometry of the least massive Type II globular clusters NGC 1261 and NGC 6934.pdf
Description:
-
Visibility:
Private
MIME-Type / Checksum:
application/pdf
Technical Metadata:
Copyright Date:
-
Copyright Info:
-
License:
-

Locators

show

Creators

show
hide
 Creators:
Marino, A. F., Author
Milone, A. P., Author
Renzini, A., Author
Yong, D., Author
Asplund, M.1, Author              
Costa, G. S. Da, Author
Jerjen, H., Author
Cordoni, G., Author
Carlos, M., Author
Dondoglio, E., Author
Lagioia, E. P., Author
Jang, S., Author
Tailo, M., Author
Affiliations:
1Stellar Astrophysics, MPI for Astrophysics, Max Planck Society, ou_159882              

Content

show
hide
Free keywords: -
 Abstract: Recent work has revealed two classes of globular clusters (GCs), dubbed Type I and Type II. Type II GCs are characterized by both a blue and a red red giant branch composed of stars with different metallicities, often coupled with distinct abundances in the slow neutron-capture elements (s-elements). Here we continue the chemical tagging of Type II GCs by adding the two least massive clusters of this class, NGC 1261 and NGC 6934. Based on both spectroscopy and photometry, we find red stars in NGC 1261 to be slightly enhanced in [Fe/H] by ∼0.1 dex and confirm that red stars of NGC 6934 are enhanced in iron by ∼0.2 dex. Neither NGC 1261 nor NGC 6934 show internal variations in the s-elements, which suggests a GC mass threshold for the occurrence of s-process enrichment. We found a significant correlation between the additional Fe locked in the red stars of Type II GCs and the present-day mass of the cluster. Nevertheless, most Type II GCs retained a small fraction of Fe produced by SNe II, lower than the 2%; NGC 6273, M54, and ω Centauri are remarkable exceptions. In the Appendix, we infer for the first time chemical abundances of lanthanum, assumed as representative of the s-elements, in M54, the GC located in the nucleus of the Sagittarius dwarf galaxy. Red-sequence stars are marginally enhanced in [La/Fe] by 0.10 ± 0.06 dex, in contrast with the large [La/Fe] spread of most Type II GCs. We suggest that different processes are responsible for the enrichment in iron and s-elements in Type II GCs.

Details

show
hide
Language(s):
 Dates: 2021-12-08
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.3847/1538-4357/ac282c
 Degree: -

Event

show

Legal Case

show

Project information

show

Source 1

show
hide
Title: The Astrophysical Journal
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: Bristol; Vienna : IOP Publishing; IAEA
Pages: - Volume / Issue: 923 (1) Sequence Number: 22 Start / End Page: - Identifier: ISSN: 0004-637X
CoNE: https://pure.mpg.de/cone/journals/resource/954922828215_3