Version 4.0.1 of the Unified Astronomy Thesaurus consists of a polyhierarchy with 2122 concepts, 11 top concepts, a depth of 11 levels, with 656 related concept links.
Release Date: 03/31/2021
- Definitions of three concepts modified.
- Removed alt label from three concepts.
- Removed defintion from one concept.
- Resolves Issues in Milestone 4.0.1 UAT Release.
| Concept URI | PrefLabel | Definition |
|---|---|---|
| http://astrothesaurus.org/uat/221 | Chandrasekhar limit | A limiting mass of about 1.44 Solar masses that the theory predicts a non-rotating white dwarf can attain without collapsing to become a neutron star or a black hole. Over this critical mass, the degeneracy pressure will be unable to bear the load of the bulk mass. |
| http://astrothesaurus.org/uat/719 | Henry Draper catalog | A catalog of stars in which every star is classified by its stellar spectrum. This system is named for the astronomer Henry Draper, but was cataloged by Annie J. Cannon (225,300 stars), and later extended by Margaret W. Mayall. |
| http://astrothesaurus.org/uat/2045 | Schonberg-Chandrasekhar limit | During the main sequence stage, a star burns the hydrogen in its core and transforms it into helium. When the helium mass amounts to about 10% of the initial stellar mass, the star can no longer maintain the hydrostatic equilibrium in its core; the star increases its volume and leaves the main sequence in order to become a red giant. |
| Concept URI | PrefLabel | Removed AltLabels |
|---|---|---|
| http://astrothesaurus.org/uat/837 | Interstellar dust extinction | Interstellar extinction |
| http://astrothesaurus.org/uat/1027 | Meridian circles | Transit telescopes |
| http://astrothesaurus.org/uat/1469 | Small Solar System bodies | Minor planets |
| http://astrothesaurus.org/uat/841 | Interstellar extinction |