A5000914398- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Gamma-ray bursts and supernovae
- Adaptive optics and wavefront sensing
- Astronomical Observations and Instrumentation
- Astro and Planetary Science
Museu de Astronomia e Ciências Afins
2021
Universidade de São Paulo
2021
We identified 8 additional stars as members of the Helmi stream (HStr) in combined GALAH+ DR3 and $Gaia$ EDR3 catalog. By consistently reevaluating claimed from literature, we consolidate a sample 22 HStr with parameters determined high-resolution spectroscopy spanning considerably wider (by $\sim$0.5 dex) metallicity interval ($-2.5 \lesssim \rm[Fe/H] < -1.0$) than previously reported. Our study focuses on $\alpha$ (Mg Ca) neutron-capture (Ba Eu) elements. find that chemistry is typical...
We present an updated sample of blue horizontal-branch (BHB) stars selected from the photometric and spectroscopic data Sloan Digital Sky Survey its associated project Extension for Galactic Understanding Exploration (SEGUE). With this data, we candidates A-type in color-color space then a mixture modeling technique was implemented order to distinguish between BHB main-sequence/blue-straggler based on their surface gravity values ($\log \rm{g}$) estimated by SEGUE Stellar Parameter Pipeline....
We present an updated sample of blue horizontal-branch (BHB) stars selected from the photometric and spectroscopic data Sloan Digital Sky Survey its associated project Extension for Galactic Understanding Exploration (SEGUE). With this data, we candidates A-type in color-color space then a mixture modeling technique was implemented order to distinguish between BHB main-sequence/blue-straggler based on their surface gravity values ($\log \rm{g}$) estimated by SEGUE Stellar Parameter Pipeline....