Stellar Parameters for over 20 Million Stars from SAGES DR1
Publish Time:2024-01-21
We present precise photometric estimates of stellar parameters, including effective temperature, metallicity, luminosity classification, distance, and stellar age, for nearly 26 million stars using the methodology developed in the first paper of this series, based on the stellar colors from the Stellar Abundances and Galactic Evolution Survey (SAGES) Data Release 1 and Gaia Early Data Release 3. The optimal design of stellar-parameter sensitive uv filters by SAGES has enabled us to determine photometric-metallicity estimates down to -3.5, similar to our previous results with the SkyMapper Southern Survey (SMSS), yielding a large sample of over five million metal-poor ([Fe/H] ≤ -1.0) stars and nearly one million very metal-poor ([Fe/H] ≤ -2.0) stars. The typical precision is around 0.1 dex for both dwarf and giant stars with [Fe/H] > -1.0, and 0.15-0.25/0.3-0.4 dex for dwarf/giant stars with [Fe/H] < -1.0. Using the precise parallax measurements and stellar colors from Gaia, effective temperature, luminosity classification, distance, and stellar age are further derived for our sample stars. This huge data set in the Northern sky from SAGES, together with similar data in the Southern sky from SMSS, will greatly advance our understanding of the Milky Way, in particular its formation and evolution.
· Data access ·
 
INTRODUCTION
Keywords
atmospheric parameter , distance , age , line-of-sight velocity
Data volume
7288.3000 MB 1 files
Sharing method
online
Sharing scope
Public
DOI
10.12149/100878
CSTR
11379.11.100878
VO Identifier
ivo://China-VO/data/sages-dr1s
CONTACT AUTHOR
Author
SAGES Team
Email
huangyang(at)ucas.ac.cn
CONTACT PUBLISHER
Email
support(at)china-vo.org
Phone
+86-10-64807973
Institution
National Astronomical Data Center
RIGHTS
Standard acknowledgement
1. According to the "SAGES Publication Policy", please be sure to correctly use the SAGES publication standards in the article, the details are as follows: The Stellar Abundance and Galactic Evolution Survey (SAGES) is a multi-band photometric project built and managed by the Research Group of the Stellar Abundance and Galactic Evolution of the National Astronomical Observatories, Chinese Academy of Sciences (NAOC). 2. If your article uses SAGES VAC data, it is strongly recommended that you cite the following article: [1] The Stellar Abundances and Galactic Evolution Survey (SAGES) -- -- I. General Description and the First Data Release (DR1) , Fan et al. 2023, ApJS, 268, 9 [2] Beyond Spectroscopy. II. Stellar Parameters for over 20 Million Stars in the Northern Sky from SAGES DR1 and Gaia DR3, Huang et al. 2023, ApJ, 957, 65
TAGS
waveband
Optical
telescope or project
Bok 2.3m Telescope at Kitt Peak
subject
Star and Interstellar Matter
data type
Catalog Data
production age
1980-
content level
Research