2023 SDSS-V Collaboration Meeting

Session

Session 14

Aug 3, 2023, 4:00 PM

Gerald D. Fischbach Auditorium/2-GDFA (160 5th Avenue)

Conveners

Session 14

• Thavisha Dharmawardena

78. Tonalli: characterizing young and main sequence stars with an asexual genetic algorithm.

Lucía Adame Villanueva (REMOTE)

8/3/23, 4:00 PM

We present the code tonalli (“heat of the sun” in Náhuatl), a python implementation of an asexual GA (Cantó et al. 2009) to solve the optimization problem of finding the best-fit synthetic spectrum for a given APOGEE-2 observed spectrum, thus effectively obtaining the stellar parameters that best characterize the spectrum.
The observed spectrum is randomly and efficiently contrasted with an...

79. Iron abundance in the Orion star-forming complex

Ricardo López-Valdivia (REMOTE)

8/3/23, 4:12 PM

In this talk, I will present an ongoing project on determining the chemical abundance of young stars with DR17. As a first approach, we selected a sample of nearly 200 fiducial members of the Orion Complex.

We used the Brussels Automatic Code for Characterizing High accUracy Spectra (BACCHUS) code and DR17 atmospheric parameters to determine the abundance of 16 iron (Fe) lines. We then...

81. An “Old” Spectroscopic Analysis Learns Some New Tricks

Rachael Beaton

8/3/23, 4:24 PM

At the conclusion of SDSS-IV, the APOGEE Stellar Parameters and Chemical Abundance Pipeline (ASPCAP) still had a few limitations that impacted the ability to use its results for some scientific applications. In this talk, I will summarize progress investigating and finding solutions for two of these limitations: (1) measurement of weak lines, like Ce and Nd (Hayes et al. 2022) and (2) the...

82. Milky Way Stars as Probes of Heavy-Element Enrichment

Shivani Shah

8/3/23, 4:36 PM

The 5 million stars that the SDSS-V Milky Way Mapper program is designed to study, will be probed for signatures of mostly light elements, up to the iron-peak, to understand the enrichment history of the Milky Way (MW). However, our understanding of the MW’s chemical enrichment will remain incomplete without the study of heavier elements, formed via neutron-capture processes. In this talk, I...

80. Closing the loop: observing Gaia white dwarfs with SDSS V

Nicola Pietro Gentile Fusillo

Over 95% of all stars in the Galaxy share the same fate: to become a white dwarf.
These small, slowly cooling stellar remnants not only encode the stellar formation history of the Milky Way, but are also unique tools with application spanning a wide range of disciplines from stellar evolution to the study of exoplanets, from exotic physics in extreme environments to the origin of type Ia...