<=== observer ===>
"ESEDLMAY",\
"Sedlmayr, E.",\
"Institut fuer Astronomie und Astrophysik",\
"Technische Universitaet Berlin",\
"Hardenbergstrasse 36",\
"Sekr. PN 8-1",\
"10623",\
"Berlin",\
"Germany",\
" 49 30 31423736",\
" 49 30 31424885",\
"jmw00434@mailszrz.zrz.TU-Berlin.DE"
<=== proposal ===>
"VACDSLPV",1,3,\
{"AGB stars","circumstellar envelopes","stellar winds"},\
{"J.M. Winters", "A.J. Fleischer", "A. Gauger", "I. Heinrichsen"}
<=== title ===>
Variability of Circumstellar Dust Shells
around Long-Period Variables
<=== abstract ===>
SCIENTIFIC ABSTRACT
Long-period and Mira variables are important stages in the late stellar
evolution of low and intermediate mass stars. In fact, they are the main
sources of galactic dust production and of a large variety of chemical
species originating from their circumstellar shells.
A reliable quantitative diagnostic and interpretation of these objects demands
both, appropriate theoretical models and specific detailed observations,
in particular in the infrared regime.
We propose periodic ISOPHOT observations of long--period variables (LPVs) at
different wavelengths in the mid-- and far--infrared range.
These measurements will yield informations about the temporal variation
of the physical conditions in different spatial regions of the circumstellar
dust shells and will allow a comparison with detailed dynamical model
calculations.
It is the aim of this project to study the wavelength--dependence of certain
structures appearing in already observed near--infrared lightcurves and in
theoretical lightcurves as well.
The data obtained with this investigation, combined with ground-based
monitoring, will also allow an interpretation of the long--term behaviour of
Miras and LPVs in different wavelength regimes.
OBSERVATION SUMMARY
**** IMPORTANT NOTE: ****
Photometric observations will be performed for only two objects from the
list given below.
We use 3 filters for PHT03 AOT at 25 microns (52'' aperture),
60 microns (120'' aperture), and 100 microns (180'' aperture).
Each observation is concatenated to a background measurement with the same
instrument setting in order to get a proper reference level. All
observations will be performed in staring mode, because the
source--to--background contrast is high and because the reference
position must be independent of the S/C roll angle. Using 32 s
integration time per filter allows to measure our objects with S/N > 100
so that brightness variations on a few percent level can be sufficiently
well assessed. Both sources will be
observed periodically in the 3 proposed filter bands at 6 fixed dates
(three times during two observation periods).
The decision as to which 2 objects will be observed can only be made
once the satallite has been launched, since it depends on the visibility
of the objects at the time required for the observations and we
anticipate that it will be possible for only 2 from the list to be
observable. These specialised fixed time observations should not
preclude more general photometry proposals being accepted.
The calculations of the time required for the
observations were performed using phtaot v1.3.
<=== scientific_justification ===>
The first date, time interval and number of times the observations should be
repeated are: (the 'first date' may vary within the interval +- 5d around
the given date)
===========================================================================
AUTUMN LAUNCH TARGETS
OBJECT FIRST DATE TIME INTERVAL [d] NO OF TIMES
Y CVn 09-Apr 1996 8 3
Y CVn 19-May 1996 8 3
V Aql 02-Mar 1996 17 3
V Aql 29-Aug 1996 17 3
T Dra 11-Feb 1996 20 3
T Dra 09-Aug 1996 20 3
VX And 09-Mar 1996 18 3
VX And 05-Nov 1996 18 3
IRC+10401 19-Mar 1996 29 3
IRC+10401 15-Sep 1996 29 3
V Cyg 02-May 1996 21 3
V Cyg 29-Oct 1996 21 3
V CrB 30-Dec 1995 18 3
V CrB 27-Jun 1996 18 3
R Scl 30-Jun 1996 18 3
R Scl 27-Dec 1996 18 3
AFGL 1235 21-Nov 1996 28 3
AFGL 1235 20-May 1997 28 3
OH/IR 300.93-0.03 24-Dec 1995 23 3
OH/IR 300.93-0.03 21-Jun 1996 23 3
SPRING LAUNCH TARGETS
OBJECT FIRST DATE TIME INTERVAL [d] NO OF TIMES
Y CVn 07-Nov 1996 8 3
Y CVn 17-Dec 1996 8 3
R Scl 30-Jun 1996 18 3
R Scl 27-Dec 1996 18 3
AFGL 1235 21-Nov 1996 28 3
AFGL 1235 20-May 1997 28 3
AFGL 935 04-Oct 1996 25 3
AFGL 935 02-Apr 1997 25 3
S Cep 17-Dec 1996 24 3
S Cep 15-Jun 1997 24 3
IRC -30050 30-Oct 1996 17 3
IRC -30050 28-Apr 1997 17 3
AFGL 799 01-Mar 1997 18 3
AFGL 799 28-Aug 1997 18 3
AFGL 1085 07-Aug 1996 36 3
AFGL 1085 03-Feb 1997 36 3
R For 24-Oct 1996 19 3
R For 22-Apr 1996 19 3
R Lep 28-May 1997 21 3
R Lep 24-Nov 1997 21 3
===========================================================================
Time distribution for autumn launch targets:
Team top 40% second 30% last 30%
PHT : ----- 11832 -----
total : ----- 11832 -----
Time distribution for spring launch targets:
Team top 40% second 30% last 30%
PHT : ----- 11832 -----
total : ----- 11832 -----
The priorities are chosen according to the expected chance, that the objects
are visible at all at the requested date. Within each priority class the
objects are listed in the order of importance. Y CVn and V Aql are high
priority objects as agreed by H. Walker. Both of these objects also have a
good chance to be observable at the reqested dates.
<=== autumn_launch_targets ===>
1, "PHT03", 2.0, "N", "Y CVn ", 12.75216, 45.44006, 2000, 0.000, 0.000, 569, 2
2, "PHT03", 2.0, "N", "Background ", 12.75216, 45.49006, 2000, 0.000, 0.000, 413, 0
3, "PHT03", 2.0, "N", "V Aql ", 19.07336, -5.68497, 2000, 0.000, 0.000, 573, 4
4, "PHT03", 2.0, "N", "Background ", 19.07336, -5.73497, 2000, 0.000, 0.000, 413, 0
5, "PHT03", 2.0, "N", "T Dra ", 17.93978, 58.21833, 2000, 0.000, 0.000, 569, 6
6, "PHT03", 2.0, "N", "Background ", 17.93978, 58.26833, 2000, 0.000, 0.000, 413, 0
7, "PHT03", 2.0, "N", "VX And ", 0.33167, 44.70961, 2000, 0.000, 0.000, 573, 8
8, "PHT03", 2.0, "N", "Background ", 0.33167, 44.75961, 2000, 0.000, 0.000, 413, 0
9, "PHT03", 2.0, "N", "IRC+10401 ", 19.05500, 7.50833, 2000, 0.000, 0.000, 573, 10
10, "PHT03", 2.0, "N", "Background ", 19.05500, 7.55833, 2000, 0.000, 0.000, 413, 0
11, "PHT03", 2.0, "N", "V Cyg ", 20.68839, 48.14194, 2000, 0.000, 0.000, 573, 12
12, "PHT03", 2.0, "N", "Background ", 20.68839, 48.19194, 2000, 0.000, 0.000, 413, 0
13, "PHT03", 2.0, "N", "V CrB ", 15.82535, 39.57203, 2000, 0.000, 0.000, 573, 14
14, "PHT03", 2.0, "N", "Background ", 15.82535, 39.62202, 2000, 0.000, 0.000, 413, 0
15, "PHT03", 2.0, "N", "R Scl ", 1.44946, -32.54283, 2000, 0.000, 0.000, 569, 16
16, "PHT03", 2.0, "N", "Background ", 1.44946, -32.59283, 2000, 0.000, 0.000, 413, 0
19, "PHT03", 2.0, "N", "OH/IR 300.93-0.03 ", 12.56525, -62.83250, 2000, 0.000, 0.000, 573, 20
20, "PHT03", 2.0, "N", "Background ", 12.56525, -62.88250, 2000, 0.000, 0.000, 413, 0
<=== spring_launch_targets ===>
1, "PHT03", 2.0, "N", "Y CVn ", 12.75216, 45.44006, 2000, 0.000, 0.000, 569, 2
2, "PHT03", 2.0, "N", "Background ", 12.75216, 45.49006, 2000, 0.000, 0.000, 413, 0
3, "PHT03", 2.0, "N", "R Scl ", 1.44946, -32.54283, 2000, 0.000, 0.000, 569, 4
4, "PHT03", 2.0, "N", "Background ", 1.44946, -32.59283, 2000, 0.000, 0.000, 413, 0
5, "PHT03", 2.0, "N", "AFGL 1235 ", 8.18024, -32.86811, 2000, 0.000, 0.000, 573, 6
6, "PHT03", 2.0, "N", "Background ", 8.18024, -32.91811, 2000, 0.000, 0.000, 413, 0
7, "PHT03", 2.0, "N", "AFGL 935 ", 6.42425, -9.53472, 2000, 0.000, 0.000, 573, 8
8, "PHT03", 2.0, "N", "Background ", 6.42425, -9.58472, 2000, 0.000, 0.000, 413, 0
9, "PHT03", 2.0, "N", "S Cep ", 21.58684, 78.62450, 2000, 0.000, 0.000, 573, 10
10, "PHT03", 2.0, "N", "Background ", 21.58684, 78.67450, 2000, 0.000, 0.000, 413, 0
11, "PHT03", 2.0, "N", "IRC -30050 ", 5.81806, -32.33333, 2000, 0.000, 0.000, 573, 12
12, "PHT03", 2.0, "N", "Background ", 5.81806, -32.38334, 2000, 0.000, 0.000, 413, 0
13, "PHT03", 2.0, "N", "AFGL 799 ", 5.67944, 13.78861, 2000, 0.000, 0.000, 573, 14
14, "PHT03", 2.0, "N", "Background ", 5.67944, 13.83861, 2000, 0.000, 0.000, 413, 0
15, "PHT03", 2.0, "N", "AFGL 1085 ", 7.20108, -20.28944, 2000, 0.000, 0.000, 573, 16
16, "PHT03", 2.0, "N", "Background ", 7.20108, -20.33945, 2000, 0.000, 0.000, 413, 0
17, "PHT03", 2.0, "N", "R For ", 2.48775, -26.09833, 2000, 0.000, 0.000, 569, 18
18, "PHT03", 2.0, "N", "Background ", 2.48775, -26.14833, 2000, 0.000, 0.000, 413, 0
19, "PHT03", 2.0, "N", "R Lep ", 4.99343, -14.80603, 2000, 0.000, 0.000, 569, 20
20, "PHT03", 2.0, "N", "Background ", 4.99343, -14.85603, 2000, 0.000, 0.000, 413, 0