METALLICITY GRADIENTS IN THE MILKY WAY DISK AS OBSERVED BY THE SEGUE SURVEY [PDF]
, 2011 The observed radial and vertical metallicity distribution of old stars in the Milky Way disk provides a powerful constraint on the chemical enrichment and dynamical history of the disk system.
Judy Y. Cheng +8 more
semanticscholar +1 more source
Disentangling Stellar Age Estimates from Galactic Chemodynamical Evolution
The Astrophysical Journal, 2023 Stellar ages are key for determining the formation history of the Milky Way, but are difficult to measure precisely. Furthermore, methods that use chemical abundances to infer ages may entangle the intrinsic evolution of stars with the chemodynamical ...
Jeff Shen +4 more
doaj +1 more source
Abundances of Disk Planetary Nebulae in M31 and the Radial Oxygen Gradient
, 2011 We have obtained spectra of 16 planetary nebulae in the disk of M31 and determined the abundances of He, N, O, Ne, S and Ar. Here we present the median abundances and compare them with previous M31 PN disk measurements and with PNe in the Milky Way.
Balick, B. +3 more
core +1 more source
Dense Gas in the Milky Way [PDF]
, 1996 We present a study of dense gas emission in the Milky Way in order to serve as a basis for comparison with extragalactic results. This study combines new observations of HCN, CS, and CO in individual GMCs and in the Milky Way plane with published studies
Leo Blitz, Liszt H. S., Tamara T. Helfer
core +2 more sources
The evolution of stellar metallicity gradients of the Milky Way disk from LSS-GAC main sequence turn-off stars: a two-phase disk formation history? [PDF]
, 2015 Accurate measurements of stellar metallicity gradients in the radial and vertical directions of the disk and their temporal variations provide important constraints on the formation and evolution of the Milky Way disk.
M. Xiang +10 more
semanticscholar +1 more source
Chemical abundance gradients from open clusters in the Milky Way disk: Results from the APOGEE survey [PDF]
, 2016 Metallicity gradients provide strong constraints for understanding the chemical evolution of the Galaxy. We report on radial abundance gradients of Fe, Ni, Ca, Si, and Mg obtained from a sample of 304 red-giant members of 29 disk open clusters, mostly ...
K. Cunha +25 more
semanticscholar +1 more source
Universe, 2023 Eicheon properties are discussed. It is shown that the eicheon surface allows setting a boundary condition for the vacuum polarization and obtaining a solution describing the dark matter tail in the Milky Way Galaxy. That is, the dark matter in the Milky
Sergey L. Cherkas +1 more
doaj +1 more source
The radial metallicity gradients in the Milky Way thick disk as fossil signatures of a primordial chemical distribution [PDF]
, 2014 In this letter we examine the evolution of the radial metallicity gradient induced by secular processes, in the disk of an $N$-body Milky Way-like galaxy. We assign a [Fe/H] value to each particle of the simulation according to an initial, cosmologically
Curir, A. +5 more
core +2 more sources
The evolution of carbon and oxygen in the bulge and disk of the Milky Way [PDF]
Astronomy & Astrophysics, 2009 The evolution of C and O abundances in the Milky Way can impose strong constraints on stellar nucleosynthesis and help understanding the formation and evolution of our Galaxy. The aim is to review the measured C and O abundances in the disk and bulge of the Galaxy and compare them with model predictions.
CESCUTTI, GABRIELE +3 more
openaire +3 more sources
A Bayesian Approach to the Vertical Structure of the Disk of the Milky Way [PDF]
The Open Journal of Astrophysics, 2020 This work investigates the vertical profile of the stars in the disk of the Milky Way. The models investigated are of the form $sech^{2/n}(nz/(2H))$ where, setting $ = 2/n$, the three functions of the sequence $ = 0,1,2$ correspond to exponential, $sech$, $sech^2$ functions.
Phillip S. Dobbie, Stephen J. Warren
openaire +6 more sources