Difference: Meeting0703 (1 vs. 3)

Revision 307 Mar 2019 - JacobChambers

Line: 1 to 1
 
META TOPICPARENT name="StewartBoogertPhotometry2018"
-- AriannaSaba - 06 Mar 2019
Line: 50 to 50
 
  1. 6177724180 0.6177724180 -1.08264 3.61834 8.304 1.101 1.370 1.654 0.873 2.399 3.226 3.287 0.110
  2. 6570298907 0.6570298907 -0.97368 3.63101 7.924 1.076 1.304 1.499 0.802 2.256 3.070 3.129 0.098
  3. 6962873634 0.6962873634 -0.87105 3.64296 7.570 1.030 1.235 1.378 0.743 2.126 2.911 2.966 0.088
    m36_hr_temperature_isochrone.png
    
    
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JC:
 
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  • Was forced to update star detecton algorithm. Used histogram of raw data to re-influence threshold decision:
hist_rawinset_blue60.png

  • Much more successful at detecting stars now:

detectedstars_blue60.pngdetectedstars_clear60.png

  • Calculated separation between highest flux star in both frames and plotted histogram of minimum separation between this star in clear frame and all corrected star coordinates in the blue frame:

hist_distancetocorrectedstars.png

  • One can see the corrected coordinates of the highest flux star at d=0 and a subsequent spread for all the other stars
  • Next, I plotted both the clear frame centroids and blue frame corrected centroids on same plot to see if stars had matched well:

centroids_matchingstars.png

  • Following this, I plotted a HR diagram for these matched stars:
hr.png
 
META FILEATTACHMENT attachment="m36_isochrones.png" attr="" comment="" date="1551893880" name="m36_isochrones.png" path="m36_isochrones.png" size="76122" user="zbvd241" version="1"
META FILEATTACHMENT attachment="m36_hr_temperature.png" attr="" comment="" date="1551893888" name="m36_hr_temperature.png" path="m36_hr_temperature.png" size="30417" user="zbvd241" version="1"
Line: 63 to 83
 
META FILEATTACHMENT attachment="Schermata_2019-03-07_alle_12.00.06.png" attr="" comment="" date="1551960035" name="Schermata_2019-03-07_alle_12.00.06.png" path="Schermata 2019-03-07 alle 12.00.06.png" size="48304" user="zbvd241" version="1"
META FILEATTACHMENT attachment="m36_hr_isochrone_modified-2.png" attr="" comment="" date="1551960496" name="m36_hr_isochrone_modified-2.png" path="m36_hr_isochrone_modified-2.png" size="38958" user="zbvd241" version="1"
META FILEATTACHMENT attachment="m36_isochronesFit-2.png" attr="" comment="" date="1551961189" name="m36_isochronesFit-2.png" path="m36_isochronesFit-2.png" size="80610" user="zbvd241" version="1"
Added:
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META FILEATTACHMENT attachment="centroids_matchingstars.png" attr="" comment="" date="1551972823" name="centroids_matchingstars.png" path="centroids_matchingstars.png" size="49204" user="zbvd104" version="1"
META FILEATTACHMENT attachment="hist_distancetocorrectedstars.png" attr="" comment="" date="1551972831" name="hist_distancetocorrectedstars.png" path="hist_distancetocorrectedstars.png" size="31650" user="zbvd104" version="1"
META FILEATTACHMENT attachment="hr.png" attr="" comment="" date="1551972837" name="hr.png" path="hr.png" size="18921" user="zbvd104" version="1"
META FILEATTACHMENT attachment="detectedstars_blue60.png" attr="" comment="" date="1551972849" name="detectedstars_blue60.png" path="detectedstars_blue60.png" size="171708" user="zbvd104" version="1"
META FILEATTACHMENT attachment="detectedstars_clear60.png" attr="" comment="" date="1551972856" name="detectedstars_clear60.png" path="detectedstars_clear60.png" size="210496" user="zbvd104" version="1"
META FILEATTACHMENT attachment="hist_rawinset_blue60.png" attr="" comment="" date="1551972868" name="hist_rawinset_blue60.png" path="hist_rawinset_blue60.png" size="16191" user="zbvd104" version="1"

Revision 207 Mar 2019 - AriannaSaba

Line: 1 to 1
 
META TOPICPARENT name="StewartBoogertPhotometry2018"
-- AriannaSaba - 06 Mar 2019
Changed:
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Turnoff.png

in a log L - log T plot, pp chain has a gradient of 5.6, CNO 8.4

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https://www.eso.org/public/outreach/eduoff/cas/cas2002/cas-projects/germany_ngc1960_1/
 
Changed:
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m36_hr_comparison_aladin.png
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https://arxiv.org/pdf/astro-ph/0003327.pdf
 
Changed:
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turn-off is visible here:
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>
  • in a log L - log T plot, pp chain has a gradient of 5.6, CNO 8.4
Turnoff.png
 
Changed:
<
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data converted according to these equations
>
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  • New HR diagram computed. Fluxes were wrong last time. Data calibrated with the accepted values by adding a constant (the published B and V of the brightest star) to the magnitude V and B measured. The brightest star in the cluster is the brightest star also in our data. Now the published and the measured data agree better.
  • No errors shown because too big. Need to fix them.
m36_hr_comparison_aladin.png
 
Changed:
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absolute magnitude: M = m_V - (5 * np.log10(D)) + 5 , D = 1330 pc
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  • turn-off is visible here in a plot of absolute magnitude vs Temperature
  • data converted according to these equations:
absolute magnitude: M = m_V - (5 * np.log10(D)) + 5 , D = 1330 pc
 
Changed:
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<
temperature: T = 4600 * ((1/((0.92*i)+0.17)) + (1/((0.92*i)+0.62))) , i = m_(B-V)
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temperature: T = 4600 * ((1/((0.92*i)+0.17)) + (1/((0.92*i)+0.62))) , i = m_(B-V)
  m36_hr_temperature.png
Changed:
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isochrones derived from these options and an age of 25 million years:
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  • isochrones derived from these options and an age of 25 million years:
 Schermata_2019-03-06_alle_17.40.46.png
Changed:
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m36_isochrones.png

however isochrones did not match my hr diagram, the data downloaded has to be adjusted.

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  • tried to fit isochrone with a Z=0.02 to the HR diagram of V vs B-V, using data of absolute magnitude and B-V.
  • The data downloaded had to be corrected to match the diagram, (B-V) + 0.225 and M_v + 11.3
  • m36_hr_isochrone_modified-2.png Schermata_2019-03-07_alle_12.00.06.png

  • Without any modification of the data, other isochrones were plotted. This time the data plotted is in absolute magnitude vs B-V as well as the isochrones.
m36_isochronesFit.png

  • with the correction in B-V only, adding a value of 0.225, probably given by the reddening, as also explained by the paper, the data seems to match very wellm36_isochronesFit-2.png

  • tried to fit isochrones in a plot of absolute magnitude vs temperature but the curves were many orders of magnitude away from the data.
  • Temperatures in the isochrones range between 4 and 3, Mv goes from 9 to -5.

# Isochrone by Pietrinferni - Cassisi - Salaris - Castelli 2006 ::: Standard Model 
#===========================================================================================================================
# Scaled solar model & transformations (Castelli 1999) +  BaSeL Library (2002)
#===========================================================================================================================
#  Np= 2000   [M/H]= 0.058   Z= 0.0198   Y=0.273   t(Gyr)=  0.0250    normalized: 18  2 2006 
#===========================================================================================================================
#     (M/Mo)in       (M/Mo)     log(L/Lo)  logTe       Mv    (U-B)   (B-V)   (V-I)   (V-R)   (V-J)   (V-K)   (V-L)   (H-K)
#===========================================================================================================================
   0.5000000000   0.4999948559  -1.39726  3.58803    9.382   1.044   1.452   2.059   0.970   2.795   3.571   3.659   0.137
   0.5392574727   0.5392574727  -1.29476  3.59741    9.031   1.076   1.440   1.937   0.957   2.666   3.466   3.542   0.129
   0.5785149454   0.5785149454  -1.19031  3.60711    8.675   1.098   1.415   1.805   0.928   2.536   3.356   3.422   0.121
   0.6177724180   0.6177724180  -1.08264  3.61834    8.304   1.101   1.370   1.654   0.873   2.399   3.226   3.287   0.110
   0.6570298907   0.6570298907  -0.97368  3.63101    7.924   1.076   1.304   1.499   0.802   2.256   3.070   3.129   0.098
   0.6962873634   0.6962873634  -0.87105  3.64296    7.570   1.030   1.235   1.378   0.743   2.126   2.911   2.966   0.088
m36_hr_temperature_isochrone.png
 
META FILEATTACHMENT attachment="m36_isochrones.png" attr="" comment="" date="1551893880" name="m36_isochrones.png" path="m36_isochrones.png" size="76122" user="zbvd241" version="1"
META FILEATTACHMENT attachment="m36_hr_temperature.png" attr="" comment="" date="1551893888" name="m36_hr_temperature.png" path="m36_hr_temperature.png" size="30417" user="zbvd241" version="1"
META FILEATTACHMENT attachment="m36_hr_comparison_aladin.png" attr="" comment="" date="1551893895" name="m36_hr_comparison_aladin.png" path="m36_hr_comparison_aladin.png" size="30067" user="zbvd241" version="1"
META FILEATTACHMENT attachment="Schermata_2019-03-06_alle_17.40.46.png" attr="" comment="" date="1551894292" name="Schermata_2019-03-06_alle_17.40.46.png" path="Schermata 2019-03-06 alle 17.40.46.png" size="87657" user="zbvd241" version="1"
META FILEATTACHMENT attachment="Turnoff.png" attr="" comment="" date="1551897858" name="Turnoff.png" path="Turnoff.png" size="26514" user="zbvd241" version="1"
Added:
>
>
META FILEATTACHMENT attachment="m36_hr_isochrone_modified.png" attr="" comment="" date="1551958310" name="m36_hr_isochrone_modified.png" path="m36_hr_isochrone_modified.png" size="37622" user="zbvd241" version="1"
META FILEATTACHMENT attachment="m36_isochronesFit.png" attr="" comment="" date="1551958954" name="m36_isochronesFit.png" path="m36_isochronesFit.png" size="81974" user="zbvd241" version="1"
META FILEATTACHMENT attachment="m36_hr_temperature_isochrone.png" attr="" comment="" date="1551959910" name="m36_hr_temperature_isochrone.png" path="m36_hr_temperature_isochrone.png" size="45205" user="zbvd241" version="1"
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META FILEATTACHMENT attachment="m36_hr_isochrone_modified-2.png" attr="" comment="" date="1551960496" name="m36_hr_isochrone_modified-2.png" path="m36_hr_isochrone_modified-2.png" size="38958" user="zbvd241" version="1"
META FILEATTACHMENT attachment="m36_isochronesFit-2.png" attr="" comment="" date="1551961189" name="m36_isochronesFit-2.png" path="m36_isochronesFit-2.png" size="80610" user="zbvd241" version="1"

Revision 106 Mar 2019 - AriannaSaba

Line: 1 to 1
Added:
>
>
META TOPICPARENT name="StewartBoogertPhotometry2018"
-- AriannaSaba - 06 Mar 2019

Turnoff.png

in a log L - log T plot, pp chain has a gradient of 5.6, CNO 8.4

m36_hr_comparison_aladin.png

turn-off is visible here:

data converted according to these equations

absolute magnitude: M = m_V - (5 * np.log10(D)) + 5 , D = 1330 pc

temperature: T = 4600 * ((1/((0.92*i)+0.17)) + (1/((0.92*i)+0.62))) , i = m_(B-V)

m36_hr_temperature.png

isochrones derived from these options and an age of 25 million years:

Schermata_2019-03-06_alle_17.40.46.png

m36_isochrones.png

however isochrones did not match my hr diagram, the data downloaded has to be adjusted.

META FILEATTACHMENT attachment="m36_isochrones.png" attr="" comment="" date="1551893880" name="m36_isochrones.png" path="m36_isochrones.png" size="76122" user="zbvd241" version="1"
META FILEATTACHMENT attachment="m36_hr_temperature.png" attr="" comment="" date="1551893888" name="m36_hr_temperature.png" path="m36_hr_temperature.png" size="30417" user="zbvd241" version="1"
META FILEATTACHMENT attachment="m36_hr_comparison_aladin.png" attr="" comment="" date="1551893895" name="m36_hr_comparison_aladin.png" path="m36_hr_comparison_aladin.png" size="30067" user="zbvd241" version="1"
META FILEATTACHMENT attachment="Schermata_2019-03-06_alle_17.40.46.png" attr="" comment="" date="1551894292" name="Schermata_2019-03-06_alle_17.40.46.png" path="Schermata 2019-03-06 alle 17.40.46.png" size="87657" user="zbvd241" version="1"
META FILEATTACHMENT attachment="Turnoff.png" attr="" comment="" date="1551897858" name="Turnoff.png" path="Turnoff.png" size="26514" user="zbvd241" version="1"
 
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