Table · dataset · 2022
Collision of two stellar associations
Listed in IVOA Registry (Virtual Observatory)
Based on Gaia DR2 data and new CHIRON radial velocities, we have discovered that two nearby stellar associations UPK 535 (318.08+/-0.29pc, 25^+15^_-10_Myr, 174 stars) and Yep 3 (339.54+/-0.25pc, 45^+55^_-20_Myr, 297 stars) in the Gum Nebula have recently collided.
Description
We project stars' current positions, motions, and measurement uncertainties backward and forward through time in a 10000-trial Monte Carlo simulation. On average, the associations' centres of mass come within 18.89+/-0.73pc of each other 0.84+/-0.03Myr ago.
A mode of 54+/-7 close (<1pc) stellar encounters occur during the collision. We cannot predict specific star-star close encounters with our current ~7.6pc distance precision and 21.5-per-cent-complete radial velocity sample. Never the less, we find that two stars in UPK 535 and two stars in Yep 3 undergo a nonspecific close encounter in >70 per cent of trials and multiple close encounters in ~30 per cent.
Read the rest (2 more)
On average, the closest approach of any two stars is 0.13+/-0.06pc, or 27000+/-12000au. With impulse-tracing values up to 2.7^+3.1^_-1.1_(M_{sun}_/pc^2^)/(km/s) , such close encounters could perturb stars' Oort cloud comets (if present), cause heavy bombardment events for exoplanets (if present), and reshape solar system architectures. Finally, an expansion of our simulation suggests other associations in the region are also interacting.
Association collisions may be commonplace, at least in the Gum Nebula straddling the Galactic plane, and may spur solar system evolution more than previously recognized.
Links
Where it is published
- Reference page cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/511/4500 ↗
landing page · from IVOA Registry
Documentation and papers
- ADS 2022MNRAS.511.4500Y ui.adsabs.harvard.edu/abs/2022MNRAS.511.4500Y ↗
publication · from IVOA Registry
Catalogue records · 2
- VOResource record dc.g-vo.org/oai.xml?verb=GetRecord&metadataPrefix=ivo_vor&identifier=ivo%3… ↗
metadata API · from IVOA Registry
- Registry record (GAVO) dc.g-vo.org/I/cds.vizier/j/mnras/511/4500 ↗
catalogue entry · from IVOA Registry
Topics
- Stated by source
- Optical
- From keywords
- Astronomy & Astrophysics
- Inferred from text
- Simulation 75%
Provenance · 1 source records, 9 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| IVOA Registry (Virtual Observatory) | ivo://cds.vizier/j/mnras/511/4500 | 15 d ago | JSON v1 |
| Field | Assertion | Extractor | Evidence |
|---|---|---|---|
| access_level | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| concepts[field].local:field:astronomy | mapping · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| concepts[method].local:method:simulation | enrichment · IVOA Registry | keyword-concept-rules@1.0.0 | title+description (75%) |
| concepts[modality].ivoa_waveband:optical | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| description | source · IVOA Registry | connector:ivoa_registry@1.0.0 | rr.resource.res_description |
| license_text | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| publication_date | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| title | source · IVOA Registry | connector:ivoa_registry@1.0.0 | rr.resource.res_title |
| updated_date | source · IVOA Registry | connector:ivoa_registry@1.0.0 |