Contents of: VI/111/./abstract/HHIPPELE_M33_A.abs

The following document lists the file abstract/HHIPPELE_M33_A.abs from catalogue VI/111.
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SCIENTIFIC ABSTRACT
We propose to carry out with ISOPHOT a spatially resolved study of the
dust distribution in the disks of different archetypes of spiral galaxies,
and thereby investigate the spatial distribution of star formation -
spontaneous and triggered - in relation to the optical image and to the
spiral pattern, i.e. to the dynamical properties of the galaxy (density
waves, bars, etc.).
In order to discriminate dust components of different temperatures we
will perform the observations in several colors from 25 to 160 um.

OBSERVATION STRATEGY

The present subproposal includes the photometric observations with P2,
C100, and C200, and spectrophotometric observations of M33 with PHT-S.
Because of its large extension, complete mapping is only possible for the
central area (11'x11'), and the outer regimes are done with sparse maps.
At 25um we use AOT P03 with aperture of 52" and oversampling factor 1.
For C100 and C200 we use P32 with oversampling factors of 3/2 and 1,
respectively. Integration times are 32, 16, 16, and 16 sec for the four
filters 25, 60, 100, and 160um, respectively.
In the outer regimes of the galaxy we will do sparse maps at 20 positions,
using the AOTs P17-P19 and P37-P39, and the same integration times per
position as above.
Additional information for the HII regions in M33 is available from sparse
maps done in project ISO4.2.4 ("Star formation in disk HII regions", pro=
posed by Hippelein et al.).
Four spectra will be taken from spiral arm and from interarm regimes, with
integration times of 1024sec, each, plus one spectrum of the nucleus, with
integration time of 256 sec. The S/N ratio per wavelength channel is of
the order of 5.
M33 is also target for CAM observations by Bonoli et al..
Total integration time for this subproposal is 14048sec, total performance
time 21067sec (efficiency = 67%).

The total performance time for both subproposals (iso42map + iso42m33) is
85920sec for autumn, 85712sec for spring (efficiency  65%).



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