<=== observer ===>
"CLEINERT",\
"Leinert, Ch.",\
"",\
"Max-Planck-Institut fur Astronomie",\
"Konigstuhl 17",\
"",\
"D-69117",\
"Heidelberg",\
"Germany",\
"49 6221 528264",\
"49 6221 528246",\
"leinert@mpia-hd.mpg.de"
<=== proposal ===>
"BINTTAU",1,3,\
{"circumstellar discs","star formation"},\
{"Mundt,R.", "Zinnecker,H.", "Reipurth,B."}
<=== title ===>
Binary T Tauri stars
<=== abstract ===>
SCIENTIFIC ABSTRACT
Most binary T Tauri stars have separations of
the same order as the size assumed for the circumstellar disks
of these stars (one hundred or several hundred AU). This proposal is to
investigate a representative sample of T Tauri binaries with separations
ranging from less than one AU to about 1000 AU by means of
multiband photometry from 3-200 micron. It is expected that interaction
of the binary components with their circumstellar disks or their
common circumbinary disk will reflect in the broad band energy
distribution. By comparison with a sample of single
stars (given by the ISOPHOT proposal "Evolution of disks around T Tauri
stars") we hope to see clear evidence for this interaction
between the binary components and their disks
and thus to provide necessary observational constraints for
the dynamical evolution of these systems.
The object list is taken from recent studies on the multiplicity
of T Tauri stars by Simon et al.(1992), Ghez et al.(1993),
Reipurth and Zinnecker(1993) and Leinert et al.(1993). Our main selection
criteria were to avoid confusion by neighboring T Tauri stars and to avoid
regions of strong cirrus emission.
=== summary ===
OBSERVATION SUMMARY
We propose to study three groups of binaries
group 1. Spectroscopic and close lunar occultation binaries
with separations of at most a few AU.
group 2. Binaries with separations around 10-50 AU.
group 3. Binaries with separations exceeding the typical disk sizes
of about 100 AU.
With progressively larger separations the interactions with the disks
are expected to show at progressively longer wavelenghts.
PERFORMANCE TIME OVERVIEW
Observations priority 1 priority 2 priority 3 sum
------------------------------------------------------------------
broadband photometry --- 15096 s 1776 s 16872 s
------------------------------------------------------------------
(4.2 h) (0.5 h) (4.7 h)
=== Detailed observing plan ===
The observations will be performed at 9 wavelengths between 3.6 micron
and 160 micron in triangular chopping mode (Actually for the longest wavelength
a three-point raster scan is used). The size of the diaphragms varies with
wavelength between 23 arcsec and 99 arcsec. There are no restrictions to the
actual position angle of the chopping direction.
Although the emphasis is more on the accurate determination of the
energy distribution at long wavelengths for sources with good IRAS
detection and more on detecting the long wavelength emission
for those sources with low or missing IRAS detection, we use the
same photometric scheme for all of the objects. For faint sources the
measurement at 160 micron helps to correct for long wavelength cirrus emission.
With the given integration times the flux limit for a typical source
brightness one of 0.3 Jy is 10-30 mJy in the absence of cirrus (S/N about 10).
Cirrus confusion is about 100 mJy at a wavelength 100 micron for a cirrus
brightness of 15 MJy/sr. With a typical far infrared source brightness of
around 1 Jy, again a S/N of about 10 results.
Filter t(on object) t(performance) diaphragm(") chopthrow(")
------------------------------------------------------------------
P_3.6 16 s 60 s 23 90
P_4.85 16 s 58 s 23 90
P_7.3 16 s 54 s 23 90
P_11.5 16 s 60 s 23 90
P_16 16 s 56 s 52 90
P_25 16 s 58 s 52 90
P_60 16 s 140 s 99 120
P_100 16 s 56 s 99 120
C_160 16 s 166 s --- raster scan ---
Acquisition 180 s
-------------------------------------------------------------------
Performance time 888 s (0.25 h)
<=== scientific_justification ===>
===== spring launch =====
Team top 40% middle 30% remaining 30% total performance time
---------------------------------------------------------------------
PHOT --- 15096 s 1776 s 16872 s
---------------------------------------------------------------------
(4.2 h) (0.5 h) (4.7 h)
89 % 11 %
===== autumn launch =====
Team top 40% middle 30% remaining 30% total performance time
---------------------------------------------------------------------
PHOT --- 15096 s 1776 s 16872 s
---------------------------------------------------------------------
(4.2 h) (0.5 h) (4.7 h)
89 % 11 %
======= object list =============
object(spring) object(autumn) group priority
-----------------------------------------------------------------
P1540 SR 20 1 2
GW Ori V4046 Sgr 1 2
FF Tau 160814-1857 1 2
GN Tau 160905-1859 1 2
DF Tau AK Sco 1 2
VY Tau Haro 1-4 2 2
LkHa 331 VV Cha 2 2
T Tau V853 Oph 2 2
IS Tau 155913-2233 2 2
LkCa 3 160946-1851 2 3
IW Tau 155203-2338 2 2
GG Tau WSB 76 2 2
RW Aur AS 205 3 2
UY Aur S CrA 3 2
Haro 6-10 VV CrA 3 2
UX Tau MWC 863 3 2
UZ Tau Ha 71 3 2
FX Tau Glass I 3 2
V710 Tau CV Cha 3 3
----------------------------------------------------------------
<=== autumn_launch_targets ===>
1, "PHT03", 2.0, "N", "SR 20 ", 16.42534, -24.26875, 1950, 0.000, 0.000, 722, 2
2, "PHT22", 2.0, "N", "SR 20 ", 16.42534, -24.26875, 1950, 0.000, 0.000, 166, 0
3, "PHT03", 2.0, "N", "V4046 Sgr ", 18.18158, -32.80750, 1950, 0.000, 0.000, 722, 4
4, "PHT22", 2.0, "N", "V4046 Sgr ", 18.18158, -32.80750, 1950, 0.000, 0.000, 166, 0
5, "PHT03", 2.0, "N", "160814-1857 ", 16.13739, -18.95083, 1950, 0.000, 0.000, 722, 6
6, "PHT22", 2.0, "N", "160814-1857 ", 16.13739, -18.95083, 1950, 0.000, 0.000, 166, 0
7, "PHT03", 2.0, "N", "160905-1859 ", 16.15142, -18.98667, 1950, 0.000, 0.000, 722, 8
8, "PHT22", 2.0, "N", "160905-1859 ", 16.15142, -18.98667, 1950, 0.000, 0.000, 166, 0
9, "PHT03", 2.0, "N", "AK Sco ", 16.85642, -36.80806, 1950, 0.000, 0.000, 722, 10
10, "PHT22", 2.0, "N", "AK Sco ", 16.85642, -36.80806, 1950, 0.000, 0.000, 166, 0
11, "PHT03", 2.0, "N", "Haro 1-4 ", 16.36956, -23.20694, 1950, 0.000, 0.000, 722, 12
12, "PHT22", 2.0, "N", "Haro 1-4 ", 16.36956, -23.20694, 1950, 0.000, 0.000, 166, 0
13, "PHT03", 2.0, "N", "VV Cha ", 11.10031, -76.59861, 1950, 0.000, 0.000, 722, 14
14, "PHT22", 2.0, "N", "VV Cha ", 11.10031, -76.59861, 1950, 0.000, 0.000, 166, 0
15, "PHT03", 2.0, "N", "V853 Oph ", 16.42880, -24.36172, 1950, 0.000, 0.000, 722, 16
16, "PHT22", 2.0, "N", "V853 Oph ", 16.42880, -24.36172, 1950, 0.000, 0.000, 166, 0
17, "PHT03", 2.0, "N", "155913-2233 ", 15.98683, -22.55250, 1950, 0.000, 0.000, 722, 18
18, "PHT22", 2.0, "N", "155913-2233 ", 15.98683, -22.55250, 1950, 0.000, 0.000, 166, 0
19, "PHT03", 3.0, "N", "160946-1851 ", 16.16289, -18.86333, 1950, 0.000, 0.000, 722, 20
20, "PHT22", 3.0, "N", "160946-1851 ", 16.16289, -18.86333, 1950, 0.000, 0.000, 166, 0
21, "PHT03", 2.0, "N", "155203-2338 ", 15.86739, -23.64139, 1950, 0.000, 0.000, 722, 22
22, "PHT22", 2.0, "N", "155203-2338 ", 15.86739, -23.64139, 1950, 0.000, 0.000, 166, 0
23, "PHT03", 2.0, "N", "WSB 76 ", 16.48600, -24.56667, 1950, 0.000, 0.000, 722, 24
24, "PHT22", 2.0, "N", "WSB 76 ", 16.48600, -24.56667, 1950, 0.000, 0.000, 166, 0
25, "PHT03", 2.0, "N", "AS 205 ", 16.14381, -18.51167, 1950, 0.000, 0.000, 722, 26
26, "PHT22", 2.0, "N", "AS 205 ", 16.14381, -18.51167, 1950, 0.000, 0.000, 166, 0
27, "PHT03", 2.0, "N", "S CrA ", 18.96281, -37.02694, 1950, 0.000, 0.000, 722, 28
28, "PHT22", 2.0, "N", "S CrA ", 18.96281, -37.02694, 1950, 0.000, 0.000, 166, 0
29, "PHT03", 2.0, "N", "VV CrA ", 18.99553, -37.28750, 1950, 0.000, 0.000, 722, 30
30, "PHT22", 2.0, "N", "VV CrA ", 18.99553, -37.28750, 1950, 0.000, 0.000, 166, 0
31, "PHT03", 2.0, "N", "MWC863 ", 16.62122, -23.79889, 1950, 0.000, 0.000, 722, 32
32, "PHT22", 2.0, "N", "MWC863 ", 16.62122, -23.79889, 1950, 0.000, 0.000, 166, 0
33, "PHT03", 2.0, "N", "Ha 71 ", 16.47478, -24.30417, 1950, 0.000, 0.000, 722, 34
34, "PHT22", 2.0, "N", "Ha 71 ", 16.47478, -24.30417, 1950, 0.000, 0.000, 166, 0
35, "PHT03", 2.0, "N", "Glass I ", 11.11394, -77.29194, 1950, 0.000, 0.000, 722, 36
36, "PHT22", 2.0, "N", "Glass I ", 11.11394, -77.29194, 1950, 0.000, 0.000, 166, 0
37, "PHT03", 3.0, "N", "CV Cha ", 11.18161, -76.46694, 1950, 0.000, 0.000, 722, 38
38, "PHT22", 3.0, "N", "CV Cha ", 11.18161, -76.46694, 1950, 0.000, 0.000, 166, 0
<=== spring_launch_targets ===>
1, "PHT03", 2.0, "N", "P1540 ", 5.53675, -5.43944, 1950, 0.000, 0.000, 722, 2
2, "PHT22", 2.0, "N", "P1540 ", 5.53675, -5.43944, 1950, 0.000, 0.000, 166, 0
3, "PHT03", 2.0, "N", "GW Ori ", 5.43911, 11.83133, 1950, 0.000, 0.000, 722, 4
4, "PHT22", 2.0, "N", "GW Ori ", 4.48944, 17.92194, 1950, 0.000, 0.000, 166, 0
5, "PHT03", 2.0, "N", "FF Tau ", 4.53914, 22.80111, 1950, 0.000, 0.000, 722, 6
6, "PHT22", 2.0, "N", "FF Tau ", 4.53914, 22.80111, 1950, 0.000, 0.000, 166, 0
7, "PHT03", 2.0, "N", "GN Tau ", 4.60473, 25.65311, 1950, 0.000, 0.000, 722, 8
8, "PHT22", 2.0, "N", "GN Tau ", 4.60473, 25.65311, 1950, 0.000, 0.000, 166, 0
9, "PHT03", 2.0, "N", "DF Tau ", 4.39989, 25.59500, 1950, 0.000, 0.000, 722, 10
10, "PHT22", 2.0, "N", "DF Tau ", 4.39989, 25.59500, 1950, 0.000, 0.000, 166, 0
11, "PHT03", 2.0, "N", "VY Tau ", 4.60484, 22.70064, 1950, 0.000, 0.000, 722, 12
12, "PHT22", 2.0, "N", "VY Tau ", 4.60484, 22.70064, 1950, 0.000, 0.000, 166, 0
13, "PHT03", 2.0, "N", "LkHa 331 ", 4.47289, 24.07492, 1950, 0.000, 0.000, 722, 14
14, "PHT22", 2.0, "N", "LkHa 331 ", 4.47289, 24.07492, 1950, 0.000, 0.000, 166, 0
15, "PHT03", 2.0, "N", "T Tau ", 4.31781, 19.41806, 1950, 0.000, 0.000, 722, 16
16, "PHT22", 2.0, "N", "T Tau ", 4.31781, 19.41806, 1950, 0.000, 0.000, 166, 0
17, "PHT03", 2.0, "N", "IS Tau ", 4.50907, 26.05958, 1950, 0.000, 0.000, 722, 18
18, "PHT22", 2.0, "N", "IS Tau ", 4.50907, 26.05958, 1950, 0.000, 0.000, 166, 0
19, "PHT03", 3.0, "N", "LkCa 3 ", 4.19522, 27.75139, 1950, 0.000, 0.000, 722, 20
20, "PHT22", 3.0, "N", "LkCa 3 ", 4.19522, 27.75139, 1950, 0.000, 0.000, 166, 0
21, "PHT03", 2.0, "N", "IW Tau ", 4.63387, 24.75606, 1950, 0.000, 0.000, 722, 22
22, "PHT22", 2.0, "N", "IW Tau ", 4.63387, 24.75606, 1950, 0.000, 0.000, 166, 0
23, "PHT03", 2.0, "N", "GG Tau ", 4.49364, 17.42278, 1950, 0.000, 0.000, 722, 24
24, "PHT22", 2.0, "N", "GG Tau ", 4.49364, 17.42278, 1950, 0.000, 0.000, 166, 0
25, "PHT03", 2.0, "N", "RW Aur ", 5.07714, 30.33722, 1950, 0.000, 0.000, 722, 26
26, "PHT22", 2.0, "N", "RW Aur ", 5.07714, 30.33722, 1950, 0.000, 0.000, 166, 0
27, "PHT03", 2.0, "N", "UY Aur ", 4.80992, 30.70378, 1950, 0.000, 0.000, 722, 28
28, "PHT22", 2.0, "N", "UY Aur ", 4.80992, 30.70378, 1950, 0.000, 0.000, 166, 0
29, "PHT03", 2.0, "N", "Haro 6-10 ", 4.43941, 24.44167, 1950, 0.000, 0.000, 722, 30
30, "PHT22", 2.0, "N", "Haro 6-10 ", 4.43941, 24.44167, 1950, 0.000, 0.000, 166, 0
31, "PHT03", 2.0, "N", "UX Tau ", 4.45267, 18.12250, 1950, 0.000, 0.000, 722, 32
32, "PHT22", 2.0, "N", "UX Tau ", 4.45267, 18.12250, 1950, 0.000, 0.000, 166, 0
33, "PHT03", 2.0, "N", "UZ Tau ", 4.49425, 25.77028, 1950, 0.000, 0.000, 722, 34
34, "PHT22", 2.0, "N", "UZ Tau ", 4.49425, 25.77028, 1950, 0.000, 0.000, 166, 0
35, "PHT03", 2.0, "N", "FX Tau ", 4.45775, 24.33839, 1950, 0.000, 0.000, 722, 36
36, "PHT22", 2.0, "N", "FX Tau ", 4.45775, 24.33839, 1950, 0.000, 0.000, 166, 0
37, "PHT03", 3.0, "N", "V710 Tau ", 4.48433, 18.25431, 1950, 0.000, 0.000, 722, 38
38, "PHT22", 3.0, "N", "V710 Tau ", 4.48433, 18.25431, 1950, 0.000, 0.000, 166, 0