SUMMARY OF SEQUENCE NUMBER 400000
SUMMARY OF SEQUENCE NUMBER 400000
Title: CHEMISTRY OF INTERSTELLAR DUST
Observer: PREDEHL
Subject Category: BH and NS Binaries
Seq: 400000 ObsId: 00087
Long-term Plan bin: no LTS bin
ABSTRACT
We propose to use Cyg X-2 as a bright 'candle' behind a sufficient dense column of interstellar matter in order to study absorption and scattering effects. Energy resolved scattering halos provide a clue to the chemistry of interstellar dust including the question if grains have a Silicate core and an organic mantle. Since haloes are not completely observable with a dispersive instrument, we will use the brightness distribution in cross dispersion direction for measuring the energy dependent scattering cross section. Cyg X-2 is the brightest among reasonably absorbed sources (NH > 10**21 cm**-2). We expect about 18 cts/s with HRC-S + LETG more than 500.000 cts within a 30ksec observation, respectively.
TARGET SUMMARY
| TARGET NAME |
RA | DEC |
TIME |
SI |
GRAT |
TYPE |
TC |
ROLL |
PRE |
PHASE |
MULTI |
PRI |
| CYG X-2 |
326.166667 | 38.320556 |
30.00000 |
HRC-I |
LETG |
GTO |
no |
no |
no |
no |
no |
5 |
IMAGES
(NOTE: RASS images currently only available for targets LTS scheduled on or after Apr-09-2000)
PARAMETERS
Obscat Parameters
