1. STELLA & RoboTel A prototype for a robotic telescope network? Exeter, 07/18/2005 T. Granzer, AIP

2. Scientific aims:  Doppler Imaging (R 47000; S/N 200:1)  RV of symbiotic stars (R 25000)  Lithium in evolved stars (R 47000; S/N 70-100:1)  CaII H&K survey (R 25,000; S/N >30:1)  Spectrum sky survey of solar-type stars with planets (R 47,000)  Early novae spectra (R 25,000)  Orbital periods of cataclysmic variables  Photometry and spectroscopy of XMM sources (R 25,000)  Follow-up of GRB (R 25,000)  Seyfert galaxies  Non-radial pulsations in B-stars (R 47 000; S/N 350:1)  Pulsations in close binary systems (R 47000; S/N >100)  Metallicity of stars (planets) (R 47000; S/N > 100)  Giant convection cells signatures  Abundances in open cluster stars (R 47000, S/N > 100) Strassmeier K. G., et al., 2002 Strassmeier K. G., et al., 2000 Baliunas et al., 1998 Sun

3. Twin-telescope STELLA  Tenerife / Teide  2400m Altitude  2x 1,2m telescopes  AIP/IAC STELLA

4. Two 1.2m & 0.8m, f/8 Alt/Az telescopes Project STELLA STELLA-I  Echelle Spectrograph, R  47000  2kx2k Marconi chip STELLA-II  Wide-field imager, 22’ FoV, Strømgren filters  4kx4k STA chip 11 26 04

5. Project RoboTel RoboTel  80cm copy of STELLA, 50% educational purpose  Delivery 03/15 to Potsdam  Wide-field imager, 30’ FoV, Strømgren filters  4kx4k STA chip

6. Current Status: Guiding & Acquisition unit installed (July) STELLA-I Echelle spectrograph first light (07/06) Dry-run of dispatch scheduler (May)

7. STELLA dispatch scheduling: Split evaluation of merit: 1)Hard constraints: Fullfilled during expected observing cycle 2)Modified merit function: ~ ts j for long-time, g i for short-time behavior.

8. Example: DI targets

9. 'Gridification' What we need:  Service providers to describe telescope capabilities  Common target description (RTML)  Billing/accounting schema

10. 'Gridification' Good to have:  Scheduling for networked resources  Schema for specifying observing sequences

11. Target description in XML Roofopen ∧ GuidingAvailable ∧ Goodweather AltTarget 2.50000 weight 1.0 Unique variable name Parameter range required Java class name Override defaults/ supply parameters Variables: AltTarget, AzTarget, Airmass, Elongation, SolZ, MoonDistance, MoonHeight, MoonPhase, Seeing, TauTarget, SiderealTime, JD, etc.

12. Target description cont‘d tgranzer@aip.de … TARGET_AMBIGUOUS TARGET_NOT_FOUND TARGET_NOT_AVAILABLE … hd3712_rad.xml hd4128_rad.xml hd12929_rad.xml hd18884_rad.xml hd29139_rad.xml calibration.xml User notification per e-mail Target re-schedule rules Choose sub-target from list This target will always follow

13.  XML-based sequence description.  Parallel and sequential execution possible.  Target data filled in at run-time.  Correct handling of unexpected delays.  Errors occurring alter the sequence. Sequence definition, details:

14. 1 2... 8 9 Task_open ∧ telescope_finished 10 MOVE_TELESCOPE 11 DONE_MOVE_TELESCOPE:main 12 13 14 on_group ∧ adapter_finished 15 FIND_ADAPTER 16 DONE_FIND_ADAPTER:main 17 18 19 20 DONE_MOVE_TELESCOPE:main ∧ DONE_FIND_ADAPTER:main+1000 21 22 ACQUIRE_ADAPTER 23 DONE_ACQUIRE_ADAPTER:main 24 25... 34 35 36 Task_guide 37 set1 38 Setup=="set1" 39 40 41 spectrograph_wavelength != Wavelength 42 SELECT_WAVELENGTH_ADAPTER 43 44 DONE_SELECT_WAVELENGTH_ADAPTER:set1 ∨ 45 spectrograph_wavelength == Wavelength 46 Reference to target type Parallel execution allowed Requirement to commence task Pure sequential execution This task is finished From target definition Update internal variables

15. Operations (envisioned):  Partner: Has time share on STELLA.  Partner Representative: Contact person, one per organization.  Principal Operator: Responsible for scientific operation.  Operator-in-charge: for all-year surveillance.  Program PI: PI of individual science program.

16. Normal Targets  PPI responsible for correct target format (XML based).  PR monitors granted time share, supplies target to PO.  PO puts target in STELLA database.  OiC monitors behaviour of new target.  Time share evaluated per season.

17. Quality control  OiC monitors status on nightly basis.  OiC might disable malevolent targets.  OiC informs PR at overboarding telescope load, initiates re-validation.  Science data quality within responsibility of PS.

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