IIA Institutional Repository

The evolution of the Milky Way: new insights from open clusters

Show simple item record

dc.contributor.author Reddy, A. B. S
dc.contributor.author Lambert, D. L
dc.contributor.author Giridhar, S
dc.date.accessioned 2020-11-19T13:48:15Z
dc.date.available 2020-11-19T13:48:15Z
dc.date.issued 2016-12
dc.identifier.citation Monthly Notices of the Royal Astronomical Society, Vol.463, No. 4, pp. 4366-4382 en_US
dc.identifier.issn 1365-2966.
dc.identifier.uri http://prints.iiap.res.in/handle/2248/7261
dc.description Restricted Access © Royal Astronomical Society http://dx.doi.org/10.1093/mnras/stw2287 en_US
dc.description.abstract We have collected high-dispersion echelle spectra of red giant members in the 12 open clusters (OCs) and derived stellar parameters and chemical abundances for 26 species by either line equivalent widths or synthetic spectrum analyses. We confirm the lack of an age–metallicity relation for OCs but argue that such a lack of trend for OCs arise from the limited coverage in metallicity compared to that of field stars which span a wide range in metallicity and age. We confirm that the radial metallicity gradient of OCs is steeper (flatter) for Rgc < 12 kpc (>12 kpc). We demonstrate that the sample of clusters constituting a steep radial metallicity gradient of slope −0.052 ± 0.011 dex kpc−1 at Rgc < 12 kpc are younger than 1.5 Gyr and located close to the Galactic mid-plane (| z| < 0.5 kpc) with kinematics typical of the thin disc. Whereas the clusters describing a shallow slope of −0.015 ± 0.007 dex kpc−1 at Rgc > 12 kpc are relatively old, thick disc members with a striking spread in age and height above the mid-plane (0.5 < | z| < 2.5 kpc). Our investigation reveals that the OCs and field stars yield consistent radial metallicity gradients if the comparison is limited to samples drawn from the similar vertical heights. We argue via the computation of Galactic orbits that all the outer disc clusters were actually born inwards of 12 kpc but the orbital eccentricity has taken them to present locations very far from their birthplaces. en_US
dc.language.iso en en_US
dc.publisher Oxford University Press on behalf of the Royal Astronomical Society en_US
dc.subject Stars: abundances en_US
dc.subject Galaxy: abundances en_US
dc.subject Galaxy: disc en_US
dc.subject Galaxy: kinematics and dynamics en_US
dc.subject Open clusters and associations: general en_US
dc.title The evolution of the Milky Way: new insights from open clusters en_US
dc.type Article en_US


Files in this item

This item appears in the following Collection(s)

Show simple item record

Search DSpace


Browse

My Account