The atmospheres of T Tauri stars. II - Chromospheric line fluxes and veiling

Details The atmospheres of T Tauri stars. II - Chromospheric line fluxes and veiling The atmospheres of T Tauri stars. II - Chromospheric line fluxes and veiling

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...412..363b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 412, no. 1, p. 363-374.

Astronomy and Astrophysics

Astrophysics

21

Chromosphere, Stellar Atmospheres, Stellar Spectra, T Tauri Stars, Emission Spectra, H Alpha Line, Spectral Line Width, Stellar Activity, Stellar Luminosity, Stellar Mass Accretion, Stellar Models

Scientific paper

A set of high-resolution calibrated spectra of southern T Tauri Stars (TTS), comprising objects with H-alpha equivalent widths ranging from 3 to 40 A are used to derive one-component plane-parallel chromospheric models. Our motivation is to discover how much emission activity can truly be ascribed to stellar activity, using real calibrated stellar data. We find that simple models can reproduce the Ca II line at 8542 A for most of the stars. The chromospheric enhancements are comparable to the ones found among active main-sequence stars of similar spectral type. These models cannot account for the veiling observed in TTS. Likewise, realistic TTS chromospheres are unable to create the observed Balmer jumps. The targets have a range of H-alpha strength that allow us to study possible correlations among narrow symmetric emission lines, and H-alpha which probes nonstellar regions. On the basis of their stellar vs systemic luminosities, Sz 77, Sz 82, and Sz 19 present signatures of disk accretion, in addition to the previously reported case of Sz 98. By correlating the fluxes of the Ca II IR line, H-alpha and the near-IR excess, we conclude that disk accretion may enhance the luminosity of typical chromospheric emission lines.

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