# Stars related plots

[![en](https://img.shields.io/badge/lang-en-red.svg)](README.md)
[![ru](https://img.shields.io/badge/lang-ru-green.svg)](README-ru.md)

## Variable stars statistics

Bar charts with numbers of variable stars types in the General Catalog of Variable Stars (GCVS):
![Numbers of most common variable stars types in the current version of the GCVS](./gcvs_types_distribution-combined-sorted-latest+.png "Numbers of most common variable stars types in the current version of the GCVS with stars belongs to several types of variability")
Data source: [General Catalog of Variable Stars, latest version](http://www.sai.msu.su/gcvs/gcvs/gcvs5/gcvs5.txt),
Code: [Jupyter Notebook for plotting this chart](../../src/astrodata/stars/plot_gcvs_types_chart_latest.ipynb).

See also [Numbers of most common variable stars types in the GCVS](./gcvs_types_distribution-combined-sorted.svg);
Data source: [General Catalog of Variable Stars (Samus+, 2007-2017), vartype.txt](https://cdsarc.cds.unistra.fr/ftp/B/gcvs/vartype.txt).
Code: [python script with data for plotting this charts](../../src/astrodata/stars/plot_gcvs_types_chart.py)

![Numbers of most common variable stars types in the current version of the VSX](./vsx_types_distribution-combined-sorted-latest+.png "Numbers of most common variable stars types in the current version of the VSX with stars belongs to several types of variability")
Data source: [The International Variable Star Index (Watson+, 2006-2007)](https://cdsarc.cds.unistra.fr/viz-bin/cat/B/vsx),
Code: [Jupyter Notebook for plotting this chart](../../src/astrodata/stars/plot_vsx_types_chart_latest.ipynb)
![Numbers of variable stars types discovered in Vorobyevy Gory](./vg_types_distribution-sorted-latest+.png "Numbers of variable stars types discovered in Vorobyevy Gory")
Data source: [Переменные звезды, открытые учениками ГБПОУ Воробьевы горы](https://caiko.mdp-project.ru/variability/)
![Numbers of most common variable stars types in the current versions of the GCVS and VSX](./var_types_distribution-gcvs-sorted.png "Numbers of most common variable stars types in the current versions of the GCVS and VSX")
![Numbers of most common variable stars types in the current versions of the VSX and GCVS](./var_types_distribution-vsx-sorted.png "Numbers of most common variable stars types in the current versions of the VSX and GCVS")
Code: [Jupyter Notebook for plotting this charts](../../src/astrodata/stars/plot_variable_stars_types_grouped_chart.ipynb)
![Numbers of variable stars in the GCVS, from the first edition](./gcvs-variable-stars-counts-ru.png "Numbers of variable stars in the GCVS, from the first edition")
![Numbers of variable stars, SNe and transients](./variable-stars-counts-ru.png "Numbers of variable stars (VSX and GCVS), SNe and transients")
Data source: [The International Variable Star Index (Watson+, 2006-2007)](https://cdsarc.u-strasbg.fr/ftp/B/vsx/ReadMe).
Code: [python script with data for plotting this charts](../../src/astrodata/stars/plot_variable_stars_counts.py)

## Milky Way Clusters

![Most common types of discovered variable stars in Milky Way clusters from the current version of the GCVS](./gcvs_types_distribution-xmatch-hunt2023-2s-combined-sorted-latest.png "Most common types of discovered variable stars in Milky Way clusters from the current version of the GCVS, cross-match with clusters members (Hunt+, 2023). Radius 2s")
See also [results of cross-matching of clusters members with VSX variables](./vsx_types_distribution-xmatch-hunt2023-2s-combined-sorted-latest.png) and versions with other cross-matching radius.
![All known clusters in distance-age space](./clusters-dist-age-omg-annotated.png "All known open, globular clusters and moving groups in distance-age space with marked Pleiades, Hyades, Praesepe and Ruprecht 147")
Data source: [Improving the open cluster census. II. An all-sky cluster catalogue with Gaia DR3](https://ui.adsabs.harvard.edu/abs/2023A%26A...673A.114H/abstract),
[VizieR Online Data Catalog. Hunt+, 2023](https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/673/A114).
See also [Ruprecht 147: The Oldest Nearby Open Cluster as a New Benchmark for Stellar Astrophysics](https://ui.adsabs.harvard.edu/abs/2013AJ....145..134C/abstract).
Code: [python script](../../src/astrodata/stars/plot_clusters_dist_age_distribution.py) and
[Jupyter Notebook](../../src/astrodata/stars/plot_clusters_dist_age_distribution.ipynb) for plotting this chart

## Supernovae and other transients observations

* History of supernovae observations by year
![Supernovae observations](./sne_stats_bar_chart-ru.png "Supernovae observations. Data from the Latest Supernovae Archives")
![Increasing number of supernova discoveries, years 2015-2023](./sne_discoveries_numbers-2015-2023.png "Increasing number of supernova discoveries, years 2015-2023. Data from the Latest Supernovae Archives")
Code: [python script with data for plotting this charts](../../src/astrodata/stars/plot_sne_discoveries_numbers.py)
* Cumulative number of supernovae
![Cumulative number of supernovae](./sne_transients_total_number_log_plot-ru.png "Cumulative number of supernovae")
* History of transient observations by year from Transient Name Server
![Transient observations from Transient Name Server](./transient_stats_bar_chart-ru.png "Transient observations from Transient Name Server")
Data sources: [David Bishop, Latest Supernovae Archives](https://www.rochesterastronomy.org/snimages/archives.html),
[Transient Name Server stats](https://www.wis-tns.org/stats-maps),
[Central Bureau for Astronomical Telegrams List of SNe](http://www.cbat.eps.harvard.edu/lists/Supernovae.html).
[Data as JSON](../../data/stars/sne-stats.json).
Code: [python script with data for plotting this charts](../../src/astrodata/stars/plot_sne_transients_stats.py).
[Displaying data in html page using JavaScript](https://gvard.github.io/stars/snstats/)

## Gamma-ray bursts observations

![Number of gamma-ray bursts which have been localized within a few hours to days to less than 1 degree](./grbs_total_number_plot.png "Number of gamma-ray bursts which have been localized within a few hours to days to less than 1 degree")
![Gamma-ray bursts localized within a few hours to days to less than 1 degree: chart with number of optical afterglows](./grbs_stats_bar_chart.png "Gamma-ray bursts localized within a few hours to days to less than 1 degree: chart with number of optical afterglows")
Data source: [Jochen Greiner; GRBs localized within a few hours to days to less than 1 degree](https://www.mpe.mpg.de/~jcg/grbgen.html),
[data as JSON](../../data/stars/grbs-localized-stats.json).  
Code: [python script with data for plotting this charts](../../src/astrodata/stars/plot_localized_grbs_stats.py).  
[Displaying this data in html page using JavaScript](https://gvard.github.io/grb/stats/)

## Image optimization applied

* [Scour](https://github.com/scour-project/scour)
* [TinyPNG: WebP, PNG, JPEG optimization](https://tinypng.com/)

For all stars related code see [this directory](../../src/astrodata/stars/)