The Stars of the HETDEX Survey. I. Radial Velocities and Metal-poor Stars from Low-resolution Stellar Spectra
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- Univ. of Texas at Austin, TX (United States). Department of Astronomy
- University of Texas, Austin TX (United States). Hobby Eberly Telescope
- The Pennsylvania State University, PA (United States). Department of Astronomy & Astrophysics; Space Telescope Science Institute, Baltimore, MD (United States).
- Baylor University, Waco, TX (United States). Department of Physics; The University of Texas at Austin, Austin, TX (United States). McDonald Observatory
- The Pennsylvania State University, PA (United States). Department of Astronomy & Astrophysics; The Pennsylvania State University, University Park, PA (United States). Institute for Gravitation and the Cosmos
- Max-Planck-Institut für extraterrestrische Physik, Germany
- Leibniz-Institut für Astrophysik Potsdam (AIP), Germany
- UC Santa Cruz, CA (United States). UC Observatories
- The Pennsylvania State University, PA (United States). Department of Astronomy & Astrophysics
- Leibniz-Institut für Astrophysik Potsdam (AIP), Germany; University of Groningen, Groningen (The Netherlands). Kapteyn Astronomical Institute
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 Lyαemitters. In its search for these galaxies, HETDEX will also observe a few times 105stars. 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 1σprecision of 28.0 km s-1and bias of 3.5 km s-1with respect to the Large Sky Area Multi-Object Fibre Spectroscopic Telescope surveys and 1σprecision of 27.5 km s-1and bias of 14.0 km s-1compared to the Sloan Extension for Galactic Understanding and Exploration survey. Since these RVs are for faint (G≥ 16) stars, they will be complementary to Gaia. Using t-Distributed Stochastic Neighbor Embedding (tSNE), we also demonstrate that the HETDEX spectra can be used to determine a star’sTeff, and loggand its [Fe/H]. With the tSNE 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.
- Research Organization:
- Univ. of Texas, Austin, TX (United States)
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA)
- Grant/Contract Number:
- NA0003843
- OSTI ID:
- 1850375
- Journal Information:
- The Astrophysical Journal, Vol. 911, Issue 2; ISSN 0004-637X
- Publisher:
- IOP PublishingCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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