P52-013: Origin of flares and spots on A-stars
Monitoring program instructions
PI: Heidi Korhonen, FINCA, Turku University, Finland
CoIs:
M.G. Pedersen, and V. Antoci, SAC, Aarhus University, Denmark
J. Viuho, Helsinki University, Finland
Background information
Recent observations with the Kepler satellite suggest the presence of
flares in about 1.5% A-type stars, as well as spot-like variations in
the their light curves. With the FIES monitoring we will probe one of
the possible explanations for these theoretically unexplained results
by searching for RV changes induced by potential companions.
We will observe 9 flaring A-type stars at two different epochs during
P52 to investigate possible radial velocity variations.
Observing setup
Instrument: FIES
Observing time: 1500-3600 sec per target
Instrument setup: fibre 3 (med-res)
Observing constraints:
For most of the targets no weather or seeing restrictions but in
case of bad seeing and/or thin clouds please increase the exposure time
to compensate. We are aiming at S/N of approximately 50. The three
faintest targets have seeing restriction of 1.3" and clear conditions.
Targets:
|
RA |
Dec |
V mag |
Exp time |
finding chart | Priority |
KIC6219684 |
19:43:54.781 |
+41:30:11.31 |
12.1 |
2 x 1300sec |
KIC6219684.jpg |
high |
KIC5898780 |
19:50:42.590 |
+41:06:06.92 |
12.8 |
2 x 1800sec |
KIC5898780.jpg |
high |
KIC7047141 |
19:42:18.334 |
+42:31:14.98 |
12.7 |
2 x 1800sec |
KIC7047141.jpg |
high |
KIC7978512 |
19:50:17.969 |
+43:45:03.39 |
12.3 |
2 x 1500sec |
KIC7978512.jpg |
high |
KIC7097723 |
18:57:32.959 |
+42:41:47.94 |
11.7 |
1800sec |
KIC7097723.jpg |
KIC9216367 |
19:24:20.868 |
+45:39:16.72 |
12.1 |
2 x 1300sec |
KIC9216367.jpg |
KIC10971633 |
19:19:05.019 |
+48:27:52.72 |
11.5 |
1500sec |
KIC10971633.jpg |
KIC10489286 |
19:53:07.946 |
+47:41:48.99 |
11.8 |
1800sec |
KIC10489286.jpg |
KIC8044889 |
19:47:56.448 |
+43:48:13.10 |
12.6 |
2 x 1800sec |
KIC8044889.jpg |
In each case the target is the bright star in the middle of the
finding chart.
Calibrations:
One ThAr calibration should be obtained during the night
whenever the targets are observed. Even if more targets than one are
observed, one ThAr is enough during the night. Standard FIES
calibrations should be obtained in the afternoon before the observing
night.
Observing dates and target(s)
Visibility plot for today for the targets stars.
All the targets should be observed twice during the period 52,
once in September-November 2015 and once in March 2015.
All observations are queued in the
main OB queue.
The schedule of these observations still needs
to be confirmed.
Proposed possible observing dates:
September 18, until about 2UT
September 26, until about 2UT
October 23, until about 23 UT
October 26, until about 23 UT
November 04, the first ~2 hours of the night
November 13, the first ~2 hours of the night
November 14, the first ~2 hours of the night
November 21, the first ~1 hours of the night
November 22, the first ~1 hours of the night
March 09, the last ~2 hours of the night
March 10, the last ~2 hours of the night
March 13, the last ~2 hours of the night
March 15, the last ~2 hours of the night
March 16, the last ~2 hours of the night
March 19, the last ~3 hours of the night
March 22, the last ~3 hours of the night
March 23, the last ~3 hours of the night
March 30, the last ~3 hours of the night
March 31, the last ~3 hours of the night
In the afternoon:
- Set FIEStool running to get quick reductions of all
the FIES spectra during the night
- Run fies-calibs for fibre 3:
fies.fies-calibs -fib 3
During the night
You can find all the observing scripts in the
folder ~/scripts/52-013/.
Observations
- If you have been observing with some other instrument than FIES, run
tcs.setup-tel-fies
- Go to the program directory ~/scripts/52-013/ in
the StanCam sequencer
- Set the observer name, object name and rempath and set remsave on:
fies.observer P52-013
fies.rempath /data/service/52/013
fies.remsave_on
- Before the science observations take one ThAr spectrum with fibre 3
fies.setup-fib3-thar
fies.easythar
fies.lamp 7 off
- Exposure times for all the targets are given above
- Run one or more of the OB-generator scripts.
These scripts will:
- add the target coordinates to the TCS catalogue
- slew to the target and start guiding
- start target acquisition for fibre 3 :
remember that user actions are required.
After the target is acquired on the fibre, the script
will take spectra of the target.
- Make sure that the star stays on fibre during the exposure.
- The stars are faint for the default StanCam
filter. You may want to change the StanCam filter
from B to g': use ccd-filter 6 when the movie has
started.
- After each script finishes, please update the progress of the
finished OB-group in the OB queue interface and in the new
EON-report section for monitoring programs.
Send any questions about the program to
heidi.h.korhonen@utu.fi
Invalid Proposal |