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• W2033996920 abstract "view Abstract Citations (110) References (79) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Line Profile Variability of SU Aurigae Johns, Christopher M. ; Basri, Gibor Abstract We analyze approximately 100 echelle spectra of the T Tauri star SU Aur. The photospheric lines appear unveiled and show little variability. We find evidence for periodic intensity variations in the blue wing of HŒ≤ between -170 < œÖ < -110 km s-1 from line center with a period of approximately 3 days, the rotation period of the star. Both the period and velocity are the same as previously reported for HŒ± in SU Aur. Furthermore, evidence for unsteady accretion is found in the presence of a variable red displaced absorption feature with a velocity of œÖ +100 km s-1 in HŒ≤. This feature is also periodic at 3 days (unlike in HŒ±). Several spectra indicate simultaneous mass inflow and outflow. The Ca II infrared and He 1 5876 lines show modest variability and imply that the structure of the chromosphere on SU Aur is very different than solar plage regions. Variations of the Ca II lines and the He I line are well correlated with each other but only poorly correlated with Balmer line variability. We use spherically symmetric radiative transfer codes to calculate the line profiles for SU Aur. The equations of statistical equilibrium are solved using the general purpose program CLOUDY. By simultaneously fitting the Balmer lines in SU Aur, we determine to what extent these lines can be produced in a spherically symmetric wind and constrain the parameters of this wind. We find that large turbulent velocities are required at the base of such a wind, where the bulk of the emission is produced. The steady absorption feature seen at œÖ ‚âç -50 km s-1 must form in the outer portions of the stellar wind, implying a terminal velocity of the wind much below the stellar escape velocity. The mass-loss rate is determined to be about 4.5 √ó 10-9 Msun yr-1. Publication: The Astrophysical Journal Pub Date: August 1995 DOI: 10.1086/176059 Bibcode: 1995ApJ...449..341J Keywords: LINE: PROFILES; STARS: INDIVIDUAL CONSTELLATION NAME: SU AURIGAE; STARS: PRE-MAIN-SEQUENCE full text sources ADS | data products SIMBAD (4)" @default.
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• W2033996920 title "The Line Profile Variability of SU Aurigae" @default.
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