tests:astropars https://astrowiki.surrey.ac.uk/ 2026-04-30T16:29:58+00:00 https://astrowiki.surrey.ac.uk/ https://astrowiki.surrey.ac.uk/lib/tpl/dokuwiki/images/favicon.ico text/html 2022-10-24T12:26:58+00:00 Anonymous (anonymous@undisclosed.example.com) Second workshop stellar parameters https://astrowiki.surrey.ac.uk/doku.php?id=tests:astropars:astroparsii&rev=1666614418&do=diff Second workshop stellar parameters The purpose of these exercises is to simulate finding astrophysical parameters from Gaia data. We will focus on using the low resolution BP/RP data for this, but will include the information from astrometry and possibly also high-resolution RVS data. The exact aim depends on which challenges are suggested and which are popular. There may arise some constraints connected to our ability to simulate particular datasets. text/html 2022-10-24T12:26:58+00:00 Anonymous (anonymous@undisclosed.example.com) Third workshop stellar parameters https://astrowiki.surrey.ac.uk/doku.php?id=tests:astropars:astroparsiii&rev=1666614418&do=diff Third workshop stellar parameters Organizers: Melissa Ness, Kester Smith (ness AT mpia.de, smith AT mpia.de) Participants text/html 2022-10-24T12:26:58+00:00 Anonymous (anonymous@undisclosed.example.com) Challenge 1: Moving groups https://astrowiki.surrey.ac.uk/doku.php?id=tests:astropars:challenge1&rev=1666614418&do=diff Challenge 1: Moving groups Objectives * Test our ability to identify known young moving groups in velocity space as a function of distance and RVS precision. * Investigate Gaia-like data, to quantify the expected errors and reveal new methods for identifying groups with accurate distance information text/html 2022-10-24T12:26:58+00:00 Anonymous (anonymous@undisclosed.example.com) Challenge 2: Reference stars https://astrowiki.surrey.ac.uk/doku.php?id=tests:astropars:challenge2&rev=1666614418&do=diff Challenge 2: Reference stars Objectives * Employ high-resolution spectra from X-shooter archive to investigate how the Gaia spectra will look like. * Investigate GSP-Phot performance on X-shooter spectra. Comparison to RVS and BP/RP spectra * text/html 2022-10-24T12:26:58+00:00 Anonymous (anonymous@undisclosed.example.com) Challenge 3: Fit BP/RP and RVS simultaneously https://astrowiki.surrey.ac.uk/doku.php?id=tests:astropars:challenge3&rev=1666614418&do=diff Challenge 3: Fit BP/RP and RVS simultaneously Objectives * Compare performance of GSP-Phot to Andy's SICK code when fitting only BP/RP. * Investigate fitting BP/RP alone, RVS alone, and BP/RP+RVS simultaneously with Andy's SICK code. * Is this a route to beat APSIS? text/html 2022-10-24T12:26:58+00:00 Anonymous (anonymous@undisclosed.example.com) Challenge 4: Build test data with realistic HR diagram https://astrowiki.surrey.ac.uk/doku.php?id=tests:astropars:challenge4&rev=1666614418&do=diff Challenge 4: Build test data with realistic HR diagram Objectives * GSP-Phot draws its training data from a synthetic HR diagram. This synthetic HR diagram currently lacks giants. In particular, it lacks significant numbers of red-clump stars, BHB stars, RR Lyraes and other important stars. Consequently, GSP-Phot cannot perform very well on such stars.