Pre-main-sequence Brackett Emitters in the APOGEE DR17 Catalog: Line Strengths and Physical Properties of Accretion Columns

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dc.contributor.authorCampbell, Hunter, Khilfeh, Elliott, Covey, Kevin R., Kounkel, Marina, Ballantyne, Richard, Corey, Sabrina, Roman-Zuniga, Carlos G., Hernandez, Jesus, Martinez, Ezequiel Manzo, Ramirez, Karla Pena, Roman-Lopes, Alexandre, Stassun, Keivan G., Stringfellow, Guy S., Borissova, Jura, Chojnowski, S. Drew, Ramirez-Preciado, Valeria, Kim, Jinyoung Serena, Serna, Javier, Stutz, Amelia M., Lopez-Valdivia, Ricardo, Suarez, Genaro, Ybarra, Jason E., Longa-Pena, Penelope, Fernandez-Trincado, Jose G.
dc.date.accessioned2024-11-27T21:50:37Z
dc.date.available2024-11-27T21:50:37Z
dc.date.issued2023/01/01
dc.description.abstractVery young (t less than or similar to 10 Myr) stars possess strong magnetic fields that channel ionized gas from the interiors of their circumstellar disks to the surface of the star. Upon impacting the stellar surface, the shocked gas recombines and emits hydrogen spectral lines. To characterize the density and temperature of the gas within these accretion streams, we measure equivalent widths of Brackett (Br) 11-20 emission lines detected in 1101 APOGEE spectra of 326 likely pre-main-sequence accretors. For sources with multiple observations, we measure median epoch-to-epoch line strength variations of 10% in Br11 and 20% in Br20. We also fit the measured line ratios to predictions of radiative transfer models by Kwan & Fischer. We find characteristic best-fit electron densities of n ( e ) = 10(11)-10(12) cm(-3), and excitation temperatures that are inversely correlated with electron density (from T similar to 5000 K for n ( e ) similar to 10(12) cm(-3) to T similar to 12,500 K at n ( e ) similar to 10(11) cm(-3)). These physical parameters are in good agreement with predictions from modeling of accretion streams that account for the hydrodynamics and radiative transfer within the accretion stream. We also present a supplementary catalog of line measurements from 9733 spectra of 4255 Brackett emission-line sources in the APOGEE Data Release 17 data set.
dc.identifier.doihttp://dx.doi.org/10.3847/1538-4357/aca324
dc.identifier.issn0004-637X
dc.identifier.urihttps://publicacionesabiertas.userena.cl/handle/123456789/116
dc.languageEnglish
dc.publisherIOP Publishing Ltd
dc.subjectFINAL TARGETING STRATEGY, DIGITAL SKY SURVEY, T-TAURI STARS, MAGNETOSPHERIC ACCRETION, DISK ACCRETION, H-I, EMISSION, EVOLUTION, HYDROGEN, PROFILES
dc.titlePre-main-sequence Brackett Emitters in the APOGEE DR17 Catalog: Line Strengths and Physical Properties of Accretion Columns
dc.typeArticle

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