My favourite resource for variable star theory, at an entry level that could be useful to amateur astronomers.

AAVSO observing sections: https://www.aavso.org/observing-sections
VSX vartypes: https://www.aavso.org/vsx/index.php?view=about.vartypes
OGLE ATLAS: http://ogle.astrouw.edu.pl/atlas/index.html
ASAS-SN ATLAS: https://asas-sn.osu.edu/atlas

Useful free tools for light curve analysis (time-domain series).

VStar: https://www.aavso.org/vstar
Period04: http://period04.net/

Useful photometry archives to download data of variable stars.

ASAS-SN Variable Star Database: https://asas-sn.osu.edu/variables
ASAS-SN Sky Patrol: https://asas-sn.osu.edu/
ASAS-SN Sky Patrol 2.0: http://asas-sn.ifa.hawaii.edu/skypatrol/
MAST archive: https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html
OGLE IV archive: http://ogledb.astrouw.edu.pl/~ogle/OCVS/
ZTF archive: https://irsa.ipac.caltech.edu/cgi-bin/Gator/nph-scan?submit=Select&projshort=ZTF
ATLAS archive: https://fallingstar-data.com/forcedphot/

#variablestars
#astrotools

For amateur astronomers there are interesting opportunities to contribute in citizen science: see the new project Gaia Vari on Zooniverse!

https://www.zooniverse.org/projects/gaia-zooniverse/gaia-vari

#variablestars

Referenced link: https://phys.org/news/2023-03-variable-stars-kepler-spacecraft.html
Discuss on https://discu.eu/q/https://phys.org/news/2023-03-variable-stars-kepler-spacecraft.html

Originally posted by Phys.org / @physorg_com: http://nitter.platypush.tech/physorg_com/status/1638525942543908866#m

Nearly 300 #variablestars detected with Kepler spacecraft @arxiv https://arxiv.org/abs/2303.07422 https://phys.org/news/2023-03-variable-stars-kepler-spacecraft.html

Within #Gaia Vari, an ESA-funded #citizenscience project, you can help classify Gaia's #variablestars — stars that change in brightness over time. These observations are key to better understand these celestial bodies better: https://www.esa.int/Enabling_Support/Preparing_for_the_Future/Space_for_Earth/Amateur_astronomers_needed_help_classify_stars_with_Gaia_s_data

Subject: Log(I) vs Log(P) Diagram.

This diagram shows the clear relation between the apparent magnitude in I-band (infrared), that stands for an equivalent measure for the brightness, and the pulsation period for many types of variable (pulsating) stars.

These stars are collected from the Small Magellanic Cloud, a Milky Way satellite galaxy: therefore, all these stars are actually almost at the same distance from us. So, the apparent magnitude is a good parameter correlated with the absolute magnitude.

Credits: OGLE - The Optical Gravitational Lensing Experiment - Phase IV; TOPCAT.

http://ogledb.astrouw.edu.pl/~ogle/OCVS/
http://www.star.bris.ac.uk/~mbt/topcat/

#variablestars
#astrotools

Subject: Log(I) vs Log(P) Diagram.

This diagram shows the clear relation between the apparent magnitude in I-band (infrared), that stands for an equivalent measure for the brightness, and the pulsation period for many types of variable (pulsating) stars.

These stars are collected from the Large Magellanic Cloud, a Milky Way satellite galaxy: therefore, all these stars are actually almost at the same distance from us. So, the apparent magnitude is a good parameter correlated with the absolute magnitude.

Credits: OGLE - The Optical Gravitational Lensing Experiment - Phase IV; TOPCAT.

http://ogledb.astrouw.edu.pl/~ogle/OCVS/
http://www.star.bris.ac.uk/~mbt/topcat/

#variablestars
#astrotools

Newly identified variable stars in NGC 6611 - The Eagle Nebula!

Full story: https://phys.org/news/2023-02-dozens-variable-stars-cluster-ngc.html
📷 : https://www.eso.org/public/images/eso0926a/

#astronomy #Astrodon #astrophotography #space #News #VariableStars #stars

Referenced link: https://phys.org/news/2023-02-dozens-variable-stars-cluster-ngc.html
Discuss on https://discu.eu/q/https://phys.org/news/2023-02-dozens-variable-stars-cluster-ngc.html

Originally posted by Phys.org / @physorg_com: http://nitter.platypush.tech/physorg_com/status/1627687041700962305#m

Dozens of #variablestars detected in the open #cluster NGC 6611 @arxiv @RoyalAstroSoc https://academic.oup.com/mnras/advance-article/doi/10.1093/mnras/stad346/7022340 https://phys.org/news/2023-02-dozens-variable-stars-cluster-ngc.html

Measurements for the Z And-type star: HEN 3-653.

This, among many other stars of it's kind, has few or Zero observations within the American Association of Variable Star Observers ( AAVSO ) database.

One particular problem arises when trying to pick reasonable comparison stars, when none is present in the AAVSO chart.

I used Astrosource for the rp filter, and APT/TOPCAT for the V and B images. Calibrating with APASS and UCAC4.

#VariableStars
#astronomy
#astronomia

🚨New Episode Alert!

Listen as Kit tries to explain the many orbits in the Beta Scorpii system in our new segment Bayer's Variable Star!

Find out which hero is felled by the scorpion & who sent it (spoilers: not Hera!). And much more!

🔗 : https://starrytimepodcast.com/episodes

#astronomy #Astrodon #mythology #GreekMythology #VariableStars #StarryTime #podcast #Scorpius #Scorpio #JohannBayer #NewEpisode

Guide to Transient Astronomy https://astrobites.org/2022/10/30/guide-to-transient-astronomy/ #core-collapsesupernovae #superluminoussupernovae #supernovaprogenitors #tidaldisruptionevent #gravitationalwaves #type1asupernovae #typeiisupernovae #fastradiobursts #gamma-raybursts #radioastronomy #variablestars #whitedwarfs #supernovae #magnetars #gw170817 #kilonova #guides #novae #grbs #rrat #agn #frb #tde

Referenced link: https://phys.org/news/2022-08-ten-pulsating-variable-stars.html
Discuss on https://discu.eu/q/https://phys.org/news/2022-08-ten-pulsating-variable-stars.html

Originally posted by Phys.org / @physorg_com@twitter.com: https://twitter.com/physorg_com/status/1565323594464370688#m

Ten new pulsating #variablestars discovered https://phys.org/news/2022-08-ten-pulsating-variable-stars.html

Referenced link: https://phys.org/news/2022-08-dozens-variable-stars.html
Discuss on https://discu.eu/q/https://phys.org/news/2022-08-dozens-variable-stars.html

Originally posted by Phys.org / @physorg_com@twitter.com: https://twitter.com/physorg_com/status/1561699713409327107#m

Researchers detect dozens of new #variablestars https://phys.org/news/2022-08-dozens-variable-stars.html

Referenced link: https://phys.org/news/2022-06-astronomers-dozens-variable-stars.html
Discuss on https://discu.eu/q/https://phys.org/news/2022-06-astronomers-dozens-variable-stars.html

Originally posted by Phys.org / @physorg_com@twitter.com: https://twitter.com/physorg_com/status/1539231674789150720#m

#Astronomers discover dozens of new #variablestars https://phys.org/news/2022-06-astronomers-dozens-variable-stars.html

Referenced link: https://phys.org/news/2022-06-astronomers-variable-stars.html
Discuss on https://discu.eu/q/https://phys.org/news/2022-06-astronomers-variable-stars.html

Originally posted by Phys.org / @physorg_com@twitter.com: https://twitter.com/physorg_com/status/1531986771642306562#m

Astronomers identify 116,000 new #variablestars @OhioState https://phys.org/news/2022-06-astronomers-variable-stars.html