HRS Pipeline

Two versions of HRS pipeline products are distributed automatically every day to PIs, one based on PyHRS  (Crawford et al. 2016) and the other on MIDAS (Kniazev et al. 2016a, 2016b).

There are slight complementary differences in the two approaches, and PIs should feel free to use either or both of the results. Please cite the references above when you use the data products in your publications.

Further documentation for the PyHRS version, about how it works and what the various data products are, is available at https://github.com/saltastro/pyhrs    Note also that PyHRS can  be run by HRS users themselves using the software distribution available under this link.

Further documentation for MIDAS version, about how it works and what the various data products are, is available at http://www.saao.ac.za/~akniazev/pub/HRS_MIDAS/  See also list of documents below.

Note that neither pipeline currently includes the High Stability (HS) mode.  However, HS mode data can be reduced by running tasks available for the PIs as part of the PyHRS software distribution.

Astro Ops is very grateful for all feedback regarding the pipeline products.  Please do not hesitate to send suggestions and criticism to salthelp.  While the dedicated development work has been completed we anticipate further improvements and tweaks, especially after user feedback.

Accuracy of the pipeline

We have found that the radial velocity accuracy of the automatic pipeline products is <300 m/s for the LR, MR, HR modes using the default calibrations (i.e. nothing extra requested by the PIs, arcs and RV standards not taken in the same night necessarily).  More information is available under the MIDAS documentation.

Better accuracy might well be achieved with more involved calibrations and analysis methods.

Which data are reduced

Currently all data from the beginning of 2016-2 are reduced and available for HRS PIs.   Most of 2016-1 has also been run, and parts of 2015-2.   If not already included in the daily deliveries, pipeline data-sets can be accessed simply by using the “Request data” box on the relevant block item on your program’s Web Manager page.

Older data-sets can in principle be run as well, but we request PIs needing specific dates to request them from salthelp, for us to prioritise running past sets through the pipelines.   Please note that due to limited resources we cannot promise immediate response; also, some datasets from early 2015, and especially from before October 2014 may prove difficult to reduce accurately.

In summary, if you cannot find the pipeline products of your HRS data after requesting it on the WM, do contact salthelp to inquire about the chances to get them done.

Selected documentation

HRS MIDAS Pipeline by Alexei Kniazev:

HRS_pipeline.pdf – general description for the MIDAS HRS pipeline
RSS_HRS_LRr.pdf  – general description of the reduction
RSS_HRS_LRb.pdf  – its extension to the HRS LR blue arm
RSS_HRS_HRr.pdf  – its extension to HRS HR red arm
RSS_HRS_MRr.pdf  – its extension to HRS MR red arm
HRS_RV.pdf       – velocities accuracy with MIDAS HRS pipeline