File:Gaia characterises dynamics of 10 000 variable stars ESA25119112.png
From Wikimedia Commons, the free media repository
Jump to navigation
Jump to search
Size of this preview: 800 × 410 pixels. Other resolutions: 320 × 164 pixels | 640 × 328 pixels | 1,185 × 607 pixels.
Original file (1,185 × 607 pixels, file size: 1.01 MB, MIME type: image/png)
File information
Structured data
Captions
Summary[edit]
DescriptionGaia characterises dynamics of 10 000 variable stars ESA25119112.png |
English: ESA's star-surveying Gaia mission has released a treasure trove of new data as part of its ‘focused product release’. One of the new papers characterises the dynamics of 10 000 pulsating and binary red giant stars in by far the largest such database available to date. These stars were part of a catalogue of two million variable star candidates released in Gaia DR3, and are key when calculating cosmic distances, confirming stellar characteristics, and clarifying how stars evolve throughout the cosmos. The new release provides a better understanding of how these fascinating stars change over time. Each symbol on this skymap indicates the position of one of the sources from the catalogue. Each is colour-coded according to the star’s variability type as seen by Gaia. Red symbols are long-period variables (LPVs) whose variability is driven by the star pulsating. Green dots show so-called ‘long secondary period’ stars (LSPs), whose cause of variability is still debated but believed to be linked to a cloud of dust orbiting the star. Blue symbols are ellipsoidal variables: red giants that are part of a binary system with a dense compact object, and whose shape is distorted into an egg-like shape due to this companion’s strong gravitational pull. Each source changes in luminosity roughly periodically and has a varying line-of-sight velocity as measured by Gaia. This means that the stellar surface is either cyclically approaching or receding from us as the star pulsates, or that the star itself is approaching/receding as it moves throughout its orbit. The darker the tone and larger the size of each symbol, the more that star’s velocity changes throughout its cycle. Read more Alt-text: This image shows the plane of the Milky Way cutting horizontally across the frame, with many colourful dots overlaid – each representing a star. The dots are either red, green or blue, with the colour representing the star’s type and motion (the larger and darker the dot, the more the star’s velocity is changing throughout its cycle). Acknowledgements: Michele Trabucchi, Nami Mowlavi and Thomas Lebzelter |
Date | 10 October 2023 (upload date) |
Source | Gaia characterises dynamics of 10 000 variable stars |
Author | ESA/Gaia/DPAC |
Activity InfoField | Space Science |
Mission InfoField | Gaia |
Licensing[edit]
This media was created by the European Space Agency (ESA).
Where expressly so stated, images or videos are covered by the Creative Commons Attribution-ShareAlike 3.0 IGO (CC BY-SA 3.0 IGO) licence, ESA being an Intergovernmental Organisation (IGO), as defined by the CC BY-SA 3.0 IGO licence. The user is allowed under the terms and conditions of the CC BY-SA 3.0 IGO license to Reproduce, Distribute and Publicly Perform the ESA images and videos released under CC BY-SA 3.0 IGO licence and the Adaptations thereof, without further explicit permission being necessary, for as long as the user complies with the conditions and restrictions set forth in the CC BY-SA 3.0 IGO licence, these including that:
See the ESA Creative Commons copyright notice for complete information, and this article for additional details.
|
||
This file is licensed under the Creative Commons Attribution-ShareAlike 3.0 IGO license. Attribution: ESA/Gaia/DPAC, CC BY-SA IGO 3.0
|
File history
Click on a date/time to view the file as it appeared at that time.
Date/Time | Thumbnail | Dimensions | User | Comment | |
---|---|---|---|---|---|
current | 11:43, 29 October 2023 | 1,185 × 607 (1.01 MB) | OptimusPrimeBot (talk | contribs) | #Spacemedia - Upload of https://www.esa.int/var/esa/storage/images/esa_multimedia/images/2023/10/gaia_characterises_dynamics_of_10_000_variable_stars/25119101-1-eng-GB/Gaia_characterises_dynamics_of_10_000_variable_stars.png via Commons:Spacemedia |
You cannot overwrite this file.
File usage on Commons
There are no pages that use this file.
Metadata
This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.
Software used | |
---|---|
Horizontal resolution | 59.06 dpc |
Vertical resolution | 59.06 dpc |