English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/213849
Share/Impact:
Statistics
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:

Title

Asymmetric spatial distribution of subsolar metallicity stars in the Milky Way nuclear star cluster

AuthorsFeldmeier-Krause, A.; Kerzendorf, W.; Do, T.; Nogueras Lara, Francisco; Neumayer, N.; Walcher, C. J.; Seth, A.; Schödel, Rainer; de Zeeuw, P. T.; Hilker, M.; Lützgendorf, N.; Kuntschner, H.; Kissler-Patig, M.
KeywordsGalaxy: centre
Infrared: stars
Stars: late-type
Issue Date2020
PublisherOxford University Press
CitationMonthly Notices of the Royal Astronomical Society 494(1): 396-410 (2020)
AbstractWe present stellar metallicity measurements of more than 600 late-type stars in the central 10 pc of the Galactic Centre. Together with our previously published KMOS data, this data set allows us to investigate, for the first time, spatial variations of the nuclear star cluster's metallicity distribution. Using the integral-field spectrograph KMOS (VLT), we observed almost half of the area enclosed by the nuclear star cluster's effective radius. We extract spectra at medium spectral resolution and apply full spectral fitting utilizing the PHOENIX library of synthetic stellar spectra. The stellar metallicities range from [M/H] = −1.25 dex to [M/H] > +0.3 dex, with most of the stars having supersolar metallicity. We are able to measure an anisotropy of the stellar metallicity distribution. In the Galactic north, the portion of subsolar metallicity stars with [M/H] < 0.0 dex is more than twice as high as in the Galactic south. One possible explanation for different fractions of subsolar metallicity stars in different parts of the cluster is a recent merger event. We propose to test this hypothesis with high-resolution spectroscopy and by combining the metallicity information with kinematic data. © 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society
Publisher version (URL)http://dx.doi.org/10.1093/mnras/staa703
URIhttp://hdl.handle.net/10261/213849
DOI10.1093/mnras/staa703
ISSN0035-8711
Appears in Collections:(IAA) Artículos
Files in This Item:
File Description SizeFormat 
IAA_2020staa703.pdf4,68 MBAdobe PDFThumbnail
View/Open
Show full item record
Review this work
 


WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.