dc.description.abstract | Recent observational work has indicated mechanisms for accretion and out
ow in Herbig Ae/Be
star-disk systems may di er from magnetospheric accretion as it is thought to occur in T Tauri
star-disk systems. In this work, we assess the temporal evolution of spectral lines probing accretion
and mass loss in Herbig Ae/Be systems and test for consistency with the magnetospheric accretion
paradigm. For two Herbig Ae/Be stars, HD 98922 (B9e) and V1295 Aql (A2e), we have gathered multi-
epoch ( years) and high cadence ( minutes) high resolution optical spectra to probe a wide range
of kinematic processes. Employing a line equivalent width evolution correlation metric introduced
here, we identify species co-evolving (indicative of common line origin) via novel visualization. We
interferometrically constrain often problematically degenerate parameters, inclination and inner disk
radius, allowing us to focus on the structure of the wind, magnetosphere, and inner gaseous disk in
radiative transfer models. Over all timescales sampled, the strongest variability occurs within the
blueshifted absorption components of the Balmer series lines; the strength of variability increases
with the cadence of the observations. Finally, high resolution spectra allow us to probe substructure
within the Balmer series' blueshifted absorption components: we observe static, low-velocity features
and time-evolving features at higher velocities. Overall we nd the observed line morphologies and
variability are inconsistent with a scaled-up T Tauri magnetospheric accretion scenario. We suggest
that as magnetic eld structure and strength change dramatically with increasing stellar mass from
T Tauri to Herbig Ae/Be stars, so too may accretion and out
ow processes. | en_GB |