IoW_20220308 - Gaia
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Gaia's women in Science - Coordination Unit 8
Video: A video was created by Coordination Unit 8 to highlight the contributions from women in the Gaia Data Processing and Analysis Consortium in view of the upcoming Gaia data release 3. Credit: ESA/Gaia/DPAC. Acknowledgement: video coordinated by R. Sordo, video assembled by F. Di Giacomo (INAF - Osservatorio Astronomico di Padova).
Gaia's women in science
On 11 February some info on the contribution from women in the Gaia Data Processing and Analysis Consortium was presented. Today, on international women's day, coordination unit 8 (CU8) highlights some of the women active for Gaia data processing. About 34% of the CU8 contributions is performed by women. The percentage is quite promising when compared to the IAU gender information, which shows an overall contribution of women of 21%.
Historically, women have had a leading role in stellar spectroscopy and stellar chemistry studies. In particular, the seminal works of Annie Jump Cannon on stellar spectra classification, of Cecilia Payne-Gaposhkin on the interpretation of the stellar chemical composition from spectra and of Margaret Burbidge on stellar nucleosynthesis are among the most influential ones of the 20th century.
The Gaia promise of Astrophysical Parameters in Gaia DR3
The video above was created by coordination unit 8 to give insight in the many different areas the women of Gaia are involved in. Coordination Unit 8 is responsible for the processing of the astrophysical parameters. Astrophysical parameters provide us with more information on the stars in our Milky Way. One can think of parameters like effective temperatures (Teff), luminosities, masses, radii, reddening (AG). A better knowledge of a star can also help us improve our knowledge of their companions (a lot of the information of an exoplanet is deduced from the star it orbits). Knowledge on the location and movement of stars with certain parameters can be used to study our Milky Way in more detail.
Some of the astrophysical parameters inform us about the matter in between the stars, like dust and the interstellar medium. If there is dust in between the star and Gaia, it will affect the light observed from the star. A good map of the total galactic extinction helps to further improve our knowledge of the stars observed. An investigation of the interstellar medium can be performed with the diffuse interstellar bands (DIBs). These are absorption features seen in high-resolution stellar spectra. In the Gaia RVS spectra the 862nm DIB is observed.
More information on the astrophysical parameters to be expected in Gaia's data release 3 can be found from the EAS presentation given by Orlagh Creevey. Further updates will be provided soon on the Gaia DR3 contents page. Full details of the processing performed will become available from the processing papers of coordination unit 8, and links to these papers will be published on the Gaia DR3 papers page.
Gaia Data Release 3 in numbers
With the release of Gaia DR3 on 13 June 2022, a set of astrophysical parameters can be expected. Below some more details are given on what to expect.
What can be expected in Gaia DR3?
|Object classifications||~ 1,500,000,000|
|Stellar parameters based on BP/RP with Teff, logg, [M/H], AG, age, distance, ...||~ 480,000,000|
|Stellar parameters based on RVS with Teff, logg, [M/H], [X/M], DIB, ...||~ 5,500,000|
|Hot stars||~ 2,500,000|
|Ultra cool dwarfs||~ 94,000|
|Emission line stars||~ 60,000|
|Diffuse Interstellar bands based on RVS||~ 500,000|
|Redshifts for unresolved galaxies||~ 1,300,000|
|Redshifts for QSOs||~ 6,300,000|
|Total Galactic Extinction Map at different resolution - Healpix level 6,7,8,9||-|
|Outlier analysis||~ 56,000,000|
Credits: ESA/Gaia/DPAC; T. Roegiers, R. Sordo, F. Di Giacomo (INAF - Osservatorio Astronomico di Padova) with contributions from many of the Coordination Unit 8 members
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