The Stars of the HETDEX Survey - I. Radial velocities and metal-poor stars from 
low-resolution stellar spectra

Hawkins, Keith; Zeimann, Greg; Sneden, Chris; Cooper, Erin Mentuch; Gebhardt, Karl; Bond, Howard E.; Carrillo, Andreia; Casey, Caitlin M.; Castanheira, Barbara G.; Ciardullo, Robin; Davis, Dustin; Farrow, Daniel J.; Finkelstein, Steven L.; Hill, Gary J.; Kelz, Andreas; Liu, Chenxu; Shetrone, Matthew; Schneider, Donald P.; Starkenburg, Else; Steinmetz, Matthias; Wheeler, J. Craig

doi:10.3847/1538-4357/abe9bd

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The Stars of the HETDEX Survey - I. Radial velocities and metal-poor stars from low-resolution stellar spectra

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Farrow, Daniel J.
Optical and Interpretative Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

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Citation

Hawkins, K., Zeimann, G., Sneden, C., Cooper, E. M., Gebhardt, K., Bond, H. E., et al. (2021). The Stars of the HETDEX Survey - I. Radial velocities and metal-poor stars from low-resolution stellar spectra. The Astrophysical Journal, 911(2): 22. doi:10.3847/1538-4357/abe9bd.

Cite as: https://hdl.handle.net/21.11116/0000-0008-FF36-D

Abstract

The Hobby-Eberly Telescope Dark Energy Experiment (HETDEX) is an unbiased, massively multiplexed spectroscopic survey, designed to measure the expansion history of the universe through low-resolution (R∼750) spectra of Lyman-Alpha Emitters. In its search for these galaxies, HETDEX will also observe a few 10⁵ stars. In this paper, we present the first stellar value-added catalog within the internal second data release of the HETDEX Survey (HDR2). The new catalog contains 120,571 low-resolution spectra for 98,736 unique stars between 10<G<22 spread across the HETDEX footprint at relatively high (b∼60^∘) Galactic latitudes. With these spectra, we measure radial velocities (RVs) for ∼42,000 unique FGK-type stars in the catalog and show that the HETDEX spectra are sufficient to constrain these RVs with a 1σ precision of 28.0 km/s and bias of 3.5 km/s with respect to the LAMOST surveys and 1σ precision of 27.5 km/s and bias of 14.0 km/s compared to the SEGUE survey. Since these RVs are for faint (G≥16) stars, they will be complementary to Gaia. Using t-Distributed Stochastic Neighbor Embedding (t-SNE), we also demonstrate that the HETDEX spectra can be used to determine a star's Teff, and log g and its [Fe/H]. With the t-SNE projection of the FGK-type stars with HETDEX spectra we also identify 416 new candidate metal-poor ([Fe/H] <−1~dex) stars for future study. These encouraging results illustrate the utility of future low-resolution stellar spectroscopic surveys.