APOGEE Net: An expanded spectral model of both low mass and high mass stars

Abstract

We train a convolutional neural network, APOGEE Net, to predict $T_{\mathrm{eff}}$, $\log g$, and, for some stars, [Fe/H], based on the APOGEE spectra. This is the first pipeline adapted for these data that is capable of estimating these parameters in a self-consistent manner not only for low mass stars, (such as main sequence dwarfs, pre-main sequence stars, and red giants), but also high mass stars with $T_{\mathrm{eff}}$ in excess of 50,000 K, including hot dwarfs and blue supergiants. The catalog of ~650,000 stars presented in this paper allows for a detailed investigation of the star forming history of not just the Milky Way, but also of the Magellanic clouds, as different type of objects tracing different parts of these galaxies can be more cleanly selected through their distinct placement in $T_{\mathrm{eff}}$-$\log g$ parameter space than in previous APOGEE catalogs produced through different pipelines.

19 pages, 11 figures. Accepted to AJ. Data are available through https://www.sdss.org/dr17/data_access/value-added-catalogs/?vac_id=apogee-net:-a-unified-spectral-model Code is available through https://github.com/hutchresearch/ApogeeNet2

References in corpus (11)

• The 2.5 m Telescope of the Sloan Digital Sky Survey
• The Apache Point Observatory Galactic Evolution Experiment (APOGEE) Spectrographs
• Target Selection for the SDSS-IV APOGEE-2 Survey
• Quantitative Spectroscopy of 24 A supergiants in the Sculptor galaxy NGC 300: Flux weighted gravity luminosity relationship, metallicity and metallicity gradient
• APOGEE Chemical Abundance Patterns of the Massive Milky Way Satellites
• The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets
• Final Targeting Strategy for the SDSS-IV APOGEE-2S Survey
• A spectroscopic investigation of the O-type star population in four Cygnus OB associations. II. Determination of the fundamental parameters
• Spectroscopic evolution of massive stars on the main sequence
• Lithium abundance in atmospheres of F- and G-type supergiants and bright giants
• Early-type objects in NGC6611 and Eagle Nebula

Cited by in corpus (12)

• A blue depression in the optical spectra of M dwarfs
• A gravitational and dynamical framework of star formation: The Orion Nebula
• Stellar Properties for a Comprehensive Collection of Star Forming Regions in the SDSS APOGEE-2 Survey
• Measurement of the angular momenta of pre-main-sequence stars: early evolution of slow and fast rotators and empirical constraints on spin-down torque mechanisms
• ABYSS I: Targeting strategy for APOGEE & BOSS young star survey in SDSS-V
• NGTS clusters survey $-$ V: Rotation in the Orion Star-forming Complex
• Spectral energy distributions of classical cepheids in the Magellanic Clouds
• Exploring Be phenomena in OBA stars: a Mid-infrared search
• Toward more accurate RR Lyrae metallicities
• tonalli: an asexual genetic code to characterise APOGEE-2 stellar spectra. I. Validation with synthetic and solar spectra
• Constraints on star formation in Orion A from Gaia
• Multicolour Validation of Two Temperate Mini-Neptunes Around M-dwarf Habitable Zones