SUMMARY OF SEQUENCE NUMBER 200038

SUMMARY OF SEQUENCE NUMBER 200038

Title: FLUORESCENCE AND OPTICAL DEPTH: NEW PROBES OF CORONAL GEOMETRY

Observer: DRAKE

Subject Category: Normal Stars and WD

Seq: 200038 ObsId: 00613

Long-term Plan bin: no LTS bin

ABSTRACT

Our proposed 100ks LETG+ACIS-S observation of the X-ray bright active star sigma Gem will yield a wealth of X-ray plasma line diagnostics that will give us a giant leap forward in our understanding of its coronal densities, abundance anomalies and emission measure distribution. Unfortunately, there is one very basic unanswered question in the physics of active stellar coronae that the usual plasma diagnostics cannot address directly: What are the spatial characteristics of stellar coronae---the scale height and filling factor? What do other stellar coronae actually look like? We will provide the first direct spectroscopic answers to this question through two novel diagnostics of coronal geometry: photospheric fluorescence and resonance line optical depths.

TARGET SUMMARY

TARGET NAME RADEC TIME SI GRAT TYPE TC ROLL PRE PHASE MULTI PRI
SIGMA GEM
115.826667
28.886694
100.0000
ACIS-S
LETG
GO
yes
no
no
no
no
5

IMAGES

(NOTE: RASS images currently only available for targets LTS scheduled on or after Apr-09-2000)

Roll/Visibility

PARAMETERS

Obscat Parameters