SIMBAD references

2021A&A...649A..83F - Astronomy and Astrophysics, volume 649A, 83-83 (2021/5-1)

A KMOS survey of the nuclear disk of the Milky Way. I. Survey design and metallicities.

FRITZ T.K., PATRICK L.R., FELDMEIER-KRAUSE A., SCHODEL R., SCHULTHEIS M., GERHARD O., NANDAKUMAR G., NEUMAYER N., NOGUERAS-LARA F. and PRIETO M.A.

Abstract (from CDS):


Context. In the central few degrees of the bulge of the Milky Way there is a flattened structure of gas, dust, and stars, known as the central molecular zone, that is similar to nuclear disks in other galaxies. As a result of extreme foreground extinction, we possess only sparse information about the (mostly old) stellar population of the nuclear disk.
Aims. In this work we present our KMOS spectroscopic survey of the stars in the nuclear disk reaching the old populations. To obtain an unbiased data set, we sampled stars in the full extinction range along each line of sight.
Methods. We also observed reference fields in neighboring regions of the Galactic bulge. We describe the design and execution of the survey and present first results.
Results. We obtain spectra and five spectral indices of 3113 stars with a median S/N of 67 and measure radial velocities for 3051 stars. Of those, 2735 sources have sufficient S/N to estimate temperatures and metallicities from indices.
Conclusions. We derive metallicities using the CO 2-0 and NaI K-band spectral features, where we derive our own empirical calibration using metallicities obtained with higher-resolution observations. We use 183 giant stars for calibration spanning in metallicity from -2.5 to 0.6dex and covering temperatures of up to 5500K. The derived index based metallicities deviate from the calibration values with a scatter of 0.32dex. The internal uncertainty of our metallicities is likely smaller. We use these metallicity measurements, together with the CO index, to derive effective temperatures using literature relations. We publish the catalog in this paper. Our data set complements Galactic surveys such as Gaia and APOGEE for the inner 200pc radius of the Milky Way, which is not readily accessible by those surveys owing to extinction. We will use the derived properties in future papers for further analysis of the nuclear disk.

Abstract Copyright: © ESO 2021

Journal keyword(s): Galaxy: nucleus - Galaxy: abundances - Galaxy: kinematics and dynamics - catalogs - infrared: stars - techniques: spectroscopic

VizieR on-line data: <Available at CDS (J/A+A/649/A83): tabled1.dat tablee1.dat>

Nomenclature: Table E1: [FPF2021] NNN NN N N=3065.

Simbad objects: 3242

goto Full paper

goto View the references in ADS

To bookmark this query, right click on this link: simbad:2021A&A...649A..83F and select 'bookmark this link' or equivalent in the popup menu