#variablestars — Public Fediverse posts

New in the #VirtualObservatory: “INT monitoring of Local Grp. VII. IC 10 photometry” by Gholami M. et al.
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/170/54
#LocalGroup #VariableStars #DwarfGalaxies #Photometry

New in the #VirtualObservatory: “HC_9N {nu}_19 overtones in IRC +10216” by Pardo J.R. et al.
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/709/L13
#Spectroscopy #VariableStars

New in the #VirtualObservatory: “Rotation periods and ages of cool host stars” by Gaidos E. et al.
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/520/5283
#Exoplanets #VariableStars #VisibleAstronomy #Spectroscopy

New in the #VirtualObservatory: “TPA pulsars observing and physical properties” by Posselt B. et al.
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/520/4582
#VariableStars #Interferometry #GalaxyKinematics #RadioSources

New in the #VirtualObservatory: “Parkes pulsar flux variabilities and modulations” by Wang Z. et al.
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/520/1311
#Photometry #VariableStars #StellarDistance #GalaxyKinematics

New in the #VirtualObservatory: “Milky Way halo Gaia DR3 RR Lyrae stars” by Muraveva T. et al.
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/708/A384
#Metallicity #ProperMotions #VariableStars #MilkyWayGalaxy

New in the #VirtualObservatory: “Lightcurves from Personal Collections” by Shugarov, S. Yu. et al.
https://skvo.science.upjs.sk/personal/q/ssa/info
#LightCurves #VariableStars #TimeDomainAstronomy

New in the #VirtualObservatory: “NLTE/LTE abundances of MW's thin disk CCs” by Nunnari A. et al.
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/708/A17
#MilkyWayGalaxy #StandardStars #VariableStars #TrigonometricParallax

New in the #VirtualObservatory: “Characteristics of Blazhko stars from ZTF & LINEAR” by Donev E. et al.
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/169/310
#VisibleAstronomy #VariableStars #Photometry

New in the #VirtualObservatory: “Abundances for 60 Classical Cepheids (DCEPs)” by Trentin E. et al.
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/707/A142
#Photometry #VisibleAstronomy #ChemicalAbundances #VariableStars

New in the #VirtualObservatory: “Kolonica timeseries Cone Search” by UPJŠ
https://skvo.science.upjs.sk/upjs_ts/t/kolonica-objects/info
#VariableStars #LightCurves #TimeDomainAstronomy

New in the #VirtualObservatory: “Kolonica light curves” by UPJŠ
https://skvo.science.upjs.sk/upjs_ts/q/ssa/info
#VariableStars #LightCurves #TimeDomainAstronomy

New in the #VirtualObservatory: “CO and CN in Cepheids” by Call S. et al.
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/545/F2216
#InfraredSources #VariableStars #ChemicalAbundances

New in the #VirtualObservatory: “12yr KVN obs. of SiO and H2O masers toward WX Ser” by Lim J.-H. et al.
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/275/20
#AstrophysicalMasers #Interferometry #VariableStars #GiantStars

New in the #VirtualObservatory: “Chromospherically active stars” by Bale B. et al.
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/703/A128
#VariableStars #MagneticFields #ChemicalAbundances

New in the #VirtualObservatory: “EROS collection” by EROS collaboration
https://cdsarc.cds.unistra.fr/viz-bin/cat/II/390
#Photometry #EclipsingBinaryStars #VariableStars

New in the #VirtualObservatory: “Study of ultra short period variable binary stars” by Koen C.
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/516/2540
#VariableStars #EclipsingBinaryStars #Astrometry #Photometry

This team of Uruguayan and Mexican researchers found strong evidence of the existence of a middle age (2-5 Gyr) RR Lyrae star in Trumpler 5 star cluster. This challenges the existing evolutionary models and points out the role of binary associations as early producers of this type of stars.

#astronomy #stars #variablestars #breakthrough #research #space

https://arxiv.org/abs/2509.22336

New in the #VirtualObservatory: “BGDS DR2 Mean Photometry Cone Search” by Blex, J. et al.
http://dc.g-vo.org/bgds/l2/medphot/info
#TimeDomainAstronomy #BroadBandPhotometry #VariableStars #MilkyWayGalaxy

New in the #VirtualObservatory: “Bochum Galactic Disk Survey (BGDS) DR2 light curves” by Blex, J. et al.
http://dc.g-vo.org/bgds/l2/ssa/info
#MilkyWayGalaxy #VariableStars #TimeDomainAstronomy #Surveys

New in the #VirtualObservatory: “R Cas, o Cet, and R Leo 22GHz spectra” by Brand J. et al.
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/699/A326
#VariableStars #AstrophysicalMasers #RadioAstronomy #RadioSpectroscopy

New in the #VirtualObservatory: “Multi-mode pulsations with CO5BOLD” by Ahmad A. et al.
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/699/A148
#VariableStars #StellarAtmospheres #AstronomicalModels

Many of the stars in our Milky Way are part of binary systems. A good percentage of these systems are composed of two stars that orbit each other at a certain distance, but there are other binaries where both of the stars are so close that we can say they almost touch each other. These systems are known as semi-detached close binaries.
Normally, these binaries are comprised of a white dwarf star and its companion, which can be a main-sequence star, a red giant, or, sometimes, a brown dwarf. The thing is that in these systems, the white dwarf literally steals mass from its companion. However, the stolen material does not go directly to the white dwarf; first, it is gathered around it, forming an accretion disk that swirls around the white dwarf. And it is precisely the existence of an accretion disk that makes these systems so interesting, because of it, they tend to explode.

The first examples of explosions in these systems that come to my mind right now are the very famous Type 1a supernovae, classical novae, and dwarf novae. In this thread, I am going to write about the latter. And the main reason for this is that I had the opportunity to collaborate on a paper that studies a very peculiar dwarf nova star, which was recently published in the prestigious scientific journal Astronomy & Astrophysics.

Dwarf novae feature recurring outbursts. By “outburst” here, the reader should understand that we astronomers, amateur and professional, refer to “explosions”. In the case of these types of stars, the explosion occurs when the system loses angular momentum, resulting in an increase in its accretion rate, which in turn causes their temperature and viscosity to rise.

Some systems, after they reach their lowest angular momentum –i.e., when their orbital period is around 78 minutes– bounce back and start to slowly regain angular momentum. These systems are known as “period bouncers”. Well, it turns out that the paper in which I participated studies a dwarf nova, which was actually seen in action by several citizen scientists (!), that also happens to be a period bouncer. The star is question is known as GOTO065054+593624, or GOTO0650 for short. The paper, led by Dr. Thomas Killestein, GOTO065054+593624: An 8.5 mag amplitude dwarf nova identified in real time via Kilonova Seekers, can be found in the following link: https://tinyurl.com/GOTO0650. 1/2

#scicomm #astronomy #astrophysics #novae #variablestars #science #citizenscience

Cepheid Variable Star V1 in Andromeda Galaxy ✨

#NearbyGalaxies #Stars #UniverseAge/Size #VariableStars

⏩ 3 new pictures from Hubble (NASA) https://commons.wikimedia.org/wiki/Special:ListFiles?limit=4&user=OptimusPrimeBot&ilshowall=1&offset=20250116090401

Cepheid Variable Star V1 in Andromeda Galaxy ✨

#NearbyGalaxies #Stars #UniverseAge/Size #VariableStars

⏩ 3 new pictures from Hubble (NASA) https://commons.wikimedia.org/wiki/Special:ListFiles?limit=4&user=OptimusPrimeBot&ilshowall=1&offset=20250116090401

Cepheid Variable Star V1 in Andromeda Galaxy ✨

#NearbyGalaxies #Stars #UniverseAge/Size #VariableStars

⏩ 3 new pictures from Hubble (NASA) https://commons.wikimedia.org/wiki/Special:ListFiles?limit=4&user=OptimusPrimeBot&ilshowall=1&offset=20250116090401

In 1908, Henrietta S. Leavitt discovered that the period of a variable star could predict its brightness. This, starting in 1918, let astronomers measure the sizes of our galaxy and the observable universe. #Poetry #Science #History #Astronomy #VariableStars #Leavitt (https://sharpgiving.com/thebookofscience/items/p1918a.html)

Light curve (Planetary science 🪐)

In astronomy, a light curve is a graph of the light intensity of a celestial object or region as a function of time, typically with the magnitude of light received on the y-axis and with time on the x-axis. The light is usually in a particular frequency interval or band. Light curves can be periodic, as in the case of eclipsing binaries, Cepheid variabl...

https://en.wikipedia.org/wiki/Light_curve

#LightCurve #VariableStars #PlanetaryScience #StellarAstronomy

Light curve (Planetary science 🪐)

In astronomy, a light curve is a graph of the light intensity of a celestial object or region as a function of time, typically with the magnitude of light received on the y-axis and with time on the x-axis. The light is usually in a particular frequency interval or band. Light curves can be periodic, as in the case of eclipsing binaries, Cepheid variabl...

https://en.wikipedia.org/wiki/Light_curve

#LightCurve #VariableStars #PlanetaryScience #StellarAstronomy

I measured the change of brightness of the star RR Gem, and it is mind boggling.

RR Gem is an intrinsic variable star. And is intrinsic because internal physical processes change its radial size and opacity. It is, in other words, a pulsating variable star. Its formal type is RRab. This is an RR Lyr type of variable star, and most of them can be found in globular star clusters (that's why they are called cluster variables).

#Astrodon #science #stars #astronomy #variablestars #rrlyr

Cepheid Variable Star P42 in NGC 5468 ✨

#UniverseAge/Size #VariableStars

⏩ 2 new pictures from Hubble (NASA) https://commons.wikimedia.org/wiki/Special:ListFiles?limit=4&user=OptimusPrimeBot&ilshowall=1&offset=20240314093145

Cepheid Variable Star P42 in NGC 5468 ✨

#UniverseAge/Size #VariableStars

⏩ 2 new pictures from Hubble (NASA) https://commons.wikimedia.org/wiki/Special:ListFiles?limit=4&user=OptimusPrimeBot&ilshowall=1&offset=20240314093145

Cepheid Variable Star P42 in NGC 5468 ✨

#UniverseAge/Size #VariableStars

⏩ 2 new pictures from Hubble (NASA) https://commons.wikimedia.org/wiki/Special:ListFiles?limit=4&user=OptimusPrimeBot&ilshowall=1&offset=20240314093145

A Huge New Gaia Data Release: More Stars, Gravitational Lenses and Asteroids https://www.universetoday.com/163669/a-huge-new-gaia-data-release-more-stars-gravitational-lenses-and-asteroids/ #gaiafocuseddatarelease #gravitationallens #omegacentauri #variablestars #asteroids #milkyway #missions #quasars #science #gaia

Feeling VERY astronomical this evening, we’re observing 2 targets in 2 different directions robotically tonight! Targets XXCyg variable star and JWST (yes, the telescope!)

First fully setup 🤖 robot edition since the new domes... both telescopes and allskycam all going at once is pretty awesome 🤩 #Astrodon #astronomy #telescopes #observatory #space #jwst #variablestars

✨ Uncrowding Cepheids in the Near Infrared

#UniverseAge/Size #VariableStars

⏩ 2 new pictures from Webb (NASA) https://commons.wikimedia.org/wiki/Special:ListFiles?limit=5&user=OptimusPrimeBot&ilshowall=1&offset=20230914103052

✨ Uncrowding Cepheids in the Near Infrared

#UniverseAge/Size #VariableStars

⏩ 2 new pictures from Webb (NASA) https://commons.wikimedia.org/wiki/Special:ListFiles?limit=5&user=OptimusPrimeBot&ilshowall=1&offset=20230914103052

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

Did you know it was this woman #astronomer who figured out the most abundant atom in the universe is #hydrogen? She did quite a number of astonishing things in an environment where women weren't welcome in the sciences. Her name should be as familiar as the names of some of male contemporaries -- but some of them got the credit for work that she did (even though some tried to give her credit). What an amazing biography of Ceclia Payne-Gaposchkin.

#astronomy #stars #space #astrophysics #VariableStars #WomenInScience
https://en.wikipedia.org/wiki/Cecilia_Payne-Gaposchkin

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

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

There’s new evidence of a large cold spot partly causing dimming of Betelgeuse - Enlarge / Astronomers continue to ponder the strange, dramatic dimming in the lig... - https://arstechnica.com/?p=1786831 #variablestars #astrophysics #betelgeuse #astronomy #science #physics