  We present an analysis of the dispersed spectral data from 11 epochs (March
2011 to September 2018) of supernova remnant (SNR) 1987A observations performed
with Chandra. These observations were performed with the High Energy
Transmission Grating (HETG) as part of our ongoing Chandra monitoring campaign
of SNR 1987A, whose 1st-order dispersed spectrum provides a significantly
greater energy resolution than the previously-published 0th-order spectrum. Our
data sets with moderate exposure times of ~50-70ks per epoch cover the time
period between deep Chandra HETG observations (with individual exposures
>200ks) taken in March 2011 and March 2018. These data have a much higher
cadence than the widely-spaced deep high-resolution spectra, at the expense of
total exposure time. While statistical uncertainties are large due to low
photon count statistics in the observed 1st-order spectra, we find that
spectral model parameters are generally in line with the shock wave propagating
into the medium beyond the dense inner ring, as suggested by Frank et al. 2016.
As the reverse shock begins ionizing the heavier elements of the supernova
ejecta interior to the equatorial ring, spectral fit parameters are expected to
change as the chemical makeup and physical properties of the shocked gas
evolve. Based on our broadband spectral model fits, we find that abundance
values appear to be constant in this time period. While our results are
somewhat limited due to photon statistics, we demonstrate the utility of the
dispersed HETG spectral analysis that can be performed with our regular Chandra
monitoring observations of SNR 1987A.
