README web version of /home/usg/OPS/MTS/readme_xml/readme_82083800
Principal Investigator Email Address
Estimated Total Execution Time (hours, including overheads)
General Description
The objective of this run is to obtain high resolution, high signal-to-noise
(>=200) spectra in four wavelength regions in the J band for a sample of M dwarf
stars. The targets cover the temperature-metallicity plane from early to mid-M spectral
type and from just below solar to high metallicity. The spectra will be used for
an abundance analysis of the sample. Several of the target M dwarfs are in binaries
with FGK-type primary stars. As an independent check for the analysis, the primaries
will also be observed, with the same settings as the M dwarfs.
The target list includes 21 objects. For all except two, the observations can be
completed with one observation block (OB). For two targets (HIP 43177B, HIP 101806B),
we provide four OBs each, each one for a different wavelength setting. They can
be executed independently. We also provide three additional identical OBs for one
target (GJ 570B), which is a spectroscopic binary (see Time-Critical Aspects). This
results in at total number of 30 science OBs and an equal number of calibration
star OBs (telluric standard stars, see Special Calibration Information).
All targets are brighter than J=12 and only two are fainter than J=10.
Finding charts are provided for all science targets.
Please note the Special Execution Requirements for five targets, which are close
binaries with separations less than about 20 arcsec.
We request standard calibrations for all stars.
Waiver Requests
Three Phase 2 waiver requests were approved by Michael Hilker:
What submitted approved
1) Free wavelength settings 2008-07-24 2008-07-25
2) Adjustment of slit PA 2008-07-25 2008-07-27
3) Telluric stars finding charts 2008-07-28 2008-07-29
1) Two of the wavelength settings use a free reference wavelength:
order 47 - 1204.0 nm, order 45 - 1258.4
2) Five targets are to be observed with the derotator in SKY mode. Slit position
angles are provided, but an additional adjustment of the position angle is required
in order to center the two components of the binary systems on the slit (see Special
Execution Requirements).
3) Finding charts are skipped for 15 unambiguous telluric standard stars.
Critical Observing Condition Constraints
Time-Critical Aspects
There are no time-critical aspects associated with the run.
However, for one target (GJ 570B), which is a spectroscopic binary, we provide four
identical OBs (GJ 570B 1 to 4). Please do not execute them in the same night, but
spread them over the observable period, as far as possible (Feb to March). This
is noted in the "User Comments" of the OBs.
Special Execution Requirements
Five targets are close binaries with separations of about 20 arcsec and
less. These are to be observed with the derotator in SKY mode. Please adjust the
slit in such a way that both binary components are observed simultaneously (see
"User Comments" in the OBs).
The following table lists the provided position angles (PA) and some more information:
Target PA Separation Delta J Year of measurement
GJ 200B | 322 | 1.6" | 2 | 2001
GJ 527B | 33 | 2.8" | 4 | 2000
HIP 12048B | 188 | 6" | 3.8 | 2003
HIP 43177B | 78 | 22" | 6.5 | 2002
HIP 101806B| 175 | 11" | 4.1 | 2004
For the first two targets, the separation is quite small. If the two components
cannot be resolved on the acquisition image, the OB should be executed with the
provided PA (see "User Comments" of the respective OBs).
For HIP 43177B (separation 22 arcsec), the slit should be placed in such a way that
the fainter component is always on the slit during the whole nodding cycle. The
nod throw is set to 6 arcsec (+ jitter of 1 arcsec). Thus, the fainter component
should be centered at about 6 arcesec from one end of the slit. The brighter component
is allowed to move out of the slit for part of the nodding cycle if necessary. This
is noted in the "User Comments".
Special Calibration Information
We request the execution of a telluric standard OB for each science OB
in the same night at a similar airmass. The required calibration star OBs have been
submitted. See "Calibration Requirements" in the OBs for the science targets.
For all but two calibration stars the finding chart was skipped, because they are
unambiguous in the field.
The targeted S/N of the spectrum of the telluric stars is 600 at the reference wavelength.
The permitted spectral type range is B- and A-type.
The spectral types of the submitted calibration stars are listed in the following
table:
OB name HIP Type J mag
CAL HIP 12048B 12387 B2IV 4.80
CAL HIP 43177B 1 42540 B9V 5.27
CAL HIP 43177B 2 42540 B9V 5.27
CAL HIP 43177B 3 42540 B9V 5.27
CAL HIP 43177B 4 42540 B9V 5.27
CAL HIP 57172 55425 B5Vn 4.14
CAL HIP 57172B 55425 B5Vn 4.14
CAL GJ 527B 68276 A0Vs 5.67
CAL HIP 101806B 1 102157 B9III 5.22
CAL HIP 101806B 2 102157 B9III 5.22
CAL HIP 101806B 3 102157 B9III 5.22
CAL HIP 101806B 4 102157 B9III 5.22
CAL GJ 105 11484 B9III 4.70
CAL GJ 105B 11484 B9III 4.70
CAL GJ 200B 25281 B0.5V 3.97
CAL GJ 250 33971 B1V 5.39
CAL GJ 250B 33971 B1V 5.39
CAL GJ 570 74392 B9Vp 4.82
CAL GJ 570B 1 74392 B9Vp 4.82
CAL GJ 570B 2 74392 B9Vp 4.82
CAL GJ 570B 3 74392 B9Vp 4.82
CAL GJ 570B 4 74392 B9Vp 4.82
CAL HD 285968 21881 B3V 4.80
CAL GJ 317 42334 A0V 5.28
CAL GJ 436 60904 A0p 5.22
CAL GJ 581 74785 B8V 2.76
CAL GJ 674 86092 A0V 4.75
CAL GJ 849 110395 A0V 4.11
CAL GJ 876 112542 B9V 5.75
CAL GJ 628 78933 B1V 4.16
ToO Information
ToO Activators List
Do the README file and the instrument comments of the telluric stars
OBs include the required S/N/pixel of the spectrum of the telluric star, its spectral
type and allowed spectral range?
Do any OBs include wavelength or flatfield calibrations?
If you are observing Moving Targets, have you attached suitable ephemeris
files to your OBs?
If the slit viewer guide star is different from the target, are the RA
and DEC offsets accurate to within 0.05 arcsec and do they take into account the
relative proper motion between the two objects?
If you have preferences which OBs should be executed first for objects
at similar RA, did you make use of the User Priority field in the OBs?
Last creation of page: Tue Oct 6 15:40:28 2009
If you have comments, please contact usd-help@eso.org