Upload
adam-welch
View
229
Download
1
Embed Size (px)
Citation preview
The CoRoT ground-basedcomplementary archive
The CoRoT ground-basedcomplementary archive
Monica Rainer, Ennio PorettiM. Rosa Panzera, Angelo Mistò
INAF OABrera
M. Rainer acknowledges support from the SPACEINN grant entitled ”Exploitation of the HARPS-ESO spectra collected in the CoRoT ground based
activities”
Monica Rainer – The CoRoT ground-based complementary archive – 21 October 2013
The CoRoT ground-based
complementary archiveA large ground-based high-
resolution spectroscopic campaign
has been performed from the
launch of the CoRoT satellite (27th
December 2006) up to January
2013.
The spectroscopy complements the
photometric CoRoT observations of
asteroseismic targets.
Ground-based spectroscopyP.I. Ennio Poretti
[email protected] ESO-
LaSilla
[email protected] ESO-
LaSillaP.I. Philippe Mathias
[email protected] OHPP.I. Pedro Amado
[email protected] Calar
AltoP.I. Katrien Uytterhoeven
FIES@NOT ORMP.I. Conny Aerts
HERMES@MERCATOR ORM
[email protected] ESO-
LaSillaP.I. Karen Pollard
HERCULES@1m Mt. John
Obs.
Monica Rainer – The CoRoT ground-based complementary archive – 21 October 2013
Main studies
Monica Rainer – The CoRoT ground-based complementary archive – 21 October 2013
Most of the spectra are already been used for dedicated studies.
This large dataset of variable objects can still be exploited either
for more detailed single studies or for statistical and comparative
analysis.
HARPS spectra
For now we will build our archive using only the HARPS
spectra, that are homogenoeusly reduced and
normalised.
7150 spectra
269 objects
Monica Rainer – The CoRoT ground-based complementary archive – 21 October 2013
The ESO archive
The HARPS spectra are already stored in the ESO
archive, where both the raw data and the spectra
reduced by the HARPS pipeline at the telescope can be
found.
We have reduced the spectra with a different method,
using a semi-automated pipeline developed at the
Brera Observatory.
Monica Rainer – The CoRoT ground-based complementary archive – 21 October 2013
Reduced HARPS spectra
Automated pipeline result
Our pipeline result
Monica Rainer – The CoRoT ground-based complementary archive – 21 October 2013
Normalised HARPS spectra
All the HARPS spectra have been normalised in an
automated way. The normalisation procedure has
some problems with the first orders, but it is averall
quite good.
Monica Rainer – The CoRoT ground-based complementary archive – 21 October 2013
Physical parameters
The already normalised spectra are very useful in
the determination of the stellar physical
parameters.
HD 50870Mantegazza et al., 2012, A&A 542, 24
Monica Rainer – The CoRoT ground-based complementary archive – 21 October 2013
Format of the spectra
5-columns ASCII files with wavelength,
reduced flux, normalised flux, signal-to-noise
error and number of the echelle order.
2-columns ASCII files with wavelength and
normalised flux.
Monica Rainer – The CoRoT ground-based complementary archive – 21 October 2013
The SPACEINN archive
Other than the reduced spectra, the goal of our
SPACEINN archive is to provide many additional
information, concerning both the targets and the
single spectra.
The objects will be categorised by the variability
class and, if possible, information about the time
series will be given.
Monica Rainer – The CoRoT ground-based complementary archive – 21 October 2013
Mean line profiles
The mean line profile of each spectrum will be computed and
uploaded in the archive. The profiles are obtained using the
LSD technique (Donati et al., 1997, MNRAS 291, 658) on a
sub-region of the normalised, non-merged spectra.
Monica Rainer – The CoRoT ground-based complementary archive – 21 October 2013
Mean line profiles
The mean line profile fo each spectrum will be computed and
uploaded in the archive. The profiles are obtained using the
LSD technique (Donati et al., 1997, MNRAS 291, 658) on a
sub-region of the normalised, non-merged spectra.
Monica Rainer – The CoRoT ground-based complementary archive – 21 October 2013
Mean line profiles
The high signal-to-noise
ratio of the mean line
profiles enables a more
sensitive study of the line
profile variations.
HR 6139
Monica Rainer – The CoRoT ground-based complementary archive – 21 October 2013
Pulsating binary systems
Creevey et al., 2009, A&A 507 901
Monica Rainer – The CoRoT ground-based complementary archive – 21 October 2013
Multiple systems
HD 170200
Monica Rainer – The CoRoT ground-based complementary archive – 21 October 2013
Variable classes
In the SPACEINN archive the stars will be
characterized by their variable class, in order to
enable statistical analysis of objects of the same
kinds.
Some information on the most peculiar
characteristic of the variable will be given.
Monica Rainer – The CoRoT ground-based complementary archive – 21 October 2013
Be stars
In the case of the Be stars, we would like to give some
information on the strength and symmetry of the H-alpha
emission.
HD 49330 Floquet et al., 2009, A&A 506, 103
Monica Rainer – The CoRoT ground-based complementary archive – 21 October 2013
δ Scuti stars
Monica Rainer – The CoRoT ground-based complementary archive – 21 October 2013
δ Scuti stars
Monica Rainer – The CoRoT ground-based complementary archive – 21 October 2013
Activity index
It is possible to compute an activity index from the
CaII H and K lines to be stored in the SPACEINN
archive.
Monica Rainer – The CoRoT ground-based complementary archive – 21 October 2013
The files
For each observed spectrum, the archive will contain
three different FITS files, with VO-compliant headers:
a 5-field table with wavelength, reduced flux,
normalised flux, signal-to-noise ratio and echelle
order;
a 2-field table with wavelength and normalised
flux, where the echelle orders have been merged;
a 2-field table (velocity and normalised flux) storing
the mean line profile computed using the LSD
software.Monica Rainer – The CoRoT ground-based complementary archive – 21 October 2013
Information on the object
Looking for a variable class will return a list of objects
with their physical parameters, such as:
effective temperature, logg, metallicity;
binarity flag (none, SB1, SB2)
spectral type
information on the pulsational content of the time
series, if more than a few spectra are present in the
archive.
Monica Rainer – The CoRoT ground-based complementary archive – 21 October 2013
Information on the spectrum
Looking for an object will return a list of spectra with
some characterizing information such as:
date of the observation, HARPS mode;
signal-to-noise ratio at a predefined wavelength;
radial velocity and vsini;
activity index, emission index (Be), tbd.
Monica Rainer – The CoRoT ground-based complementary archive – 21 October 2013
Other capabilities
The user should be able to plot the spectra and the
mean line profiles and zoom them.
We would like to offer the possibility of either
plotting or downloading radial velocity curves and
other relevant quantities.
Monica Rainer – The CoRoT ground-based complementary archive – 21 October 2013
Study example
We hope that this archive
will be useful for
comparative or statistical
studies.
The spectra are already
being used in this way, but
the web interface will allow
much easier access.
Monica Rainer – The CoRoT ground-based complementary archive – 21 October 2013
Milestones
T0 + 12
Availability of the reduced spectra with full indicators
T0 + 18
Availability of simultaneous photometric and
spectroscopic curves
T0 + 24
Definition of the query interface
T0 + 30
Opening to the community
Monica Rainer – The CoRoT ground-based complementary archive – 21 October 2013
Conclusion: what we have
The reduced data and large part of the mean line
profiles.
An estimate of the physical paramenters for many
objects, but we would like to complete the work on the
whole database.
Reliable HARPS radial velocities for the objects
observed in HAM mode (R = 115,000), but we will need to
compute them for the ones observed in the EGGS mode
(R = 80,000).
Binarity flags for most of the objects.
Monica Rainer – The CoRoT ground-based complementary archive – 21 October 2013
Conclusion: work to do
Complete the previous work.
Calibrate a reliable activity index.
Determine ad hoc information on the time series in
order to give an hint on the pulsational content (i.e.,
the standard deviation of the mean line profiles from
the average mean line profile).
Defining the archive interface and the kind of output
given.
Monica Rainer – The CoRoT ground-based complementary archive – 21 October 2013