Palomar 5 Project Summary

Files for this project can be found in /home/ch558/palomar5/

Membership Selection:

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KECK

cmd: dist le 0.1 to isochrone

(isochrone dist modulus = 16.808, see selection.pro for extinction, etc)

velocity cuts: -70 < * < -40 km/s

HYDRA

cmd: dist le 0.1 to isochrone

(isochone dist modulus = 16.808, see hydraselection.pro for extinction, etc)

velocity cuts: -70 < * < -35 km/s

magnesium: on a plot of (mg1 + mg2) vs (mgb), members are < 2 from (0.15,1.0)

ODEN

velo: -80 < * < -30

(done in allvelo.pro and allcenter.pro) 

Overlapping data:

=========================

overlap.pro gives overlaps between keck and hydra data

doubles.pro finds doubles in the hydra data

oden.pro looks for overlap between odenchirken's data and keck+hydra

Relevant code:

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allvelo.pro

Reads in keck, hydra, and oden data and combines it (requires that the alldata_Pal5.fits.gz and allhydra_Pal5.fits.gz files have usable x.member columns (that = 1 for members). Plots l*cos(b) versus velocity, creates bins. Plots the bins and the dispersion bins, and then does a linear fit to the velocity bins. Prints slope of fit line (the velocity gradient per degree) and the average dispersion.

allcenter.pro

Same as allvelo.pro, but only looks at the center of pal5 (limits made and can be changed in the binning section of the code... change max_covered's first definition to control start point of binning and then change n_bins and the binning increments to adjust end point)

overlap.pro

Finds overlap between hydra and keck

doubles.pro

Finds doubles in the hydra data

oden.pro

Looks for overlap between odenkirchen's data and keck+hydra

selection.pro

Does selection for keck data, including lots of plots showing the cuts. Requires the besancon model (mw-model.resu) and m92.iso isochrone)

hydraselection.pro

Same as selection.pro, but for hydra data. 


Note: selection.pro is for keck data, hydraselection.pro for hydra data. Both have commented-out sections at the end which write the "member" column back to the fits file

Data files:
=========================

alldata_Pal5.fits.gz

allhydra_Pal5.fits.gz

(both files have member=1 for members selected by [hydra]selection.pro)

oden_center.dat

oden_tail.dat

(membership cuts only done in allvelo.pro, allcenter.pro, "just in time")


hydradoubles.dat
(two-column file listing indicies for pairs in hydra data after a quality cut)

Misc Notes

=========================

Hydra systemic error calculated to be +/- 9.8, this has already been 

added into the fits file errors

What's Next

=========================

• The doubled stars (doubles.pro, overlap.pro, oden.pro) should be folded

into each other, rather than being counted multiple times.

• In allvelo.pro, try fitting the velocity gradient line to all of the

member stars, instead of binning them (likely will just give far too much 

weight to the center of Pal5, but easily tried)

• Membership probabilites instead of hard binary cuts. Right now the members are likely, but not secure.