Full metadata record
DC Field | Value | Language |
---|---|---|
dc.contributor.author | 한상일 | * |
dc.date.accessioned | 2021-11-16T16:31:49Z | - |
dc.date.available | 2021-11-16T16:31:49Z | - |
dc.date.issued | 2021 | * |
dc.identifier.issn | 0004-6256 | * |
dc.identifier.issn | 1538-3881 | * |
dc.identifier.other | OAK-30131 | * |
dc.identifier.uri | https://dspace.ewha.ac.kr/handle/2015.oak/259533 | - |
dc.description.abstract | We performed low-resolution spectroscopy for the red giant branch stars in an intriguing globular cluster (GC) NGC 2808, which hosts subpopulations with extreme helium and light-element abundances. In order to trace N, C, and Ca abundance differences among subpopulations, we measured CN, CH, and Ca ii H&K spectral indices, respectively. We identified four subpopulations (G1, G2, G3, and G4) from CN and CH strength, with CN-weak/CH-strong G1, CN-intermediate/CH-strong G2, CN-strong/CH-intermediate G3, and CN-strong/CH-weak G4. Compared to [Na/O] from high-resolution spectroscopy, we show that CN index can more clearly separate G1 and G2. Since CN traces N abundance in a GC, it implies that G1 and G2 would show a larger difference in [N/Fe] compared to [Na/Fe], as predicted by chemical evolution models. Later generation stars G3 and G4, however, are better separated with high-resolution spectroscopy. We also found that G4 shows a stronger Ca ii H&K line strength compared to that of G1, but we suspect this to be a result of unusually strong He enhancement and/or Mg depletion in G4 of this GC. This work illustrates that combining low- and high-resolution spectroscopic studies can improve the separation of subpopulations in GCs. | * |
dc.language | English | * |
dc.publisher | IOP PUBLISHING LTD | * |
dc.title | New Subgrouping of Multiple Stellar Populations in NGC 2808 Based on Low-resolution Spectroscopy | * |
dc.type | Article | * |
dc.relation.issue | 4 | * |
dc.relation.volume | 162 | * |
dc.relation.index | SCIE | * |
dc.relation.index | SCOPUS | * |
dc.relation.journaltitle | ASTRONOMICAL JOURNAL | * |
dc.identifier.doi | 10.3847/1538-3881/ac0ce6 | * |
dc.identifier.wosid | WOS:000691741400001 | * |
dc.identifier.scopusid | 2-s2.0-85115744185 | * |
dc.author.google | Hong, Seungsoo | * |
dc.author.google | Lim, Dongwook | * |
dc.author.google | Chung, Chul | * |
dc.author.google | Kim, Jaeyeon | * |
dc.author.google | Han, Sang-Il | * |
dc.author.google | Lee, Young-Wook | * |
dc.contributor.scopusid | 한상일(55927997700;58596908800) | * |
dc.date.modifydate | 20231218162700 | * |