Table · dataset · 2026
Subdwarfs candidates detected by HsdDet in SDSS DR17
Listed in IVOA Registry (Virtual Observatory)
Hot subdwarf stars, located at the end of the blue horizontal branch, have a burning helium core, and are crucial for studying stellar structure.
Description
Currently, the number of known hot subdwarf star is relatively small. Many studies apply machine learning classification to search for hot subdwarf stars based on high quality spectra.
With the accumulated image data in the digital sky surveys, we proposed the Hot Subdwarf Detector (HsdDet), a novel multiscale object detection algorithm designed to directly locate hot subdwarf stars' coordinates in Sloan Digital Sky Survey (SDSS) images. We applied the HsdDet algorithm to some photometric images of SDSS, and detected 29,695 candidates, whose reduced proper motions are primarily concentrated between 5 and 20mas/yr.
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Most of the candidates have distances of 1.5~7.5kpc, while some candidates can be as far as 20kpc or even more. Candidates' colors are -2.5<u-g<2.0, -3.5<g-r<2.0, -2.5<r-i<2.5, and -3.0<i-z<3.0. We crossmatched the candidates catalog with Large Sky Area Multi-Object Fiber Spectroscopic Telescope and obtained 3823 spectra.
The confidence measures the probability of a candidate being a hot subdwarf star. With the confidence threshold being 0.5, 263 new hot subdwarf stars were confirmed by the spectral fitting method, and the purity is 6.9%. When we set confidence threshold at 0.9, the purity is 13.5%.
We discussed the selection bias in the search region and released the hot subdwarf stars catalog. These results have the potential to expand the population of hot subdwarf stars.
Links
Where it is published
- Reference page cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/170/94 ↗
landing page · from IVOA Registry
Documentation and papers
- ADS 2025AJ....170...94Z ui.adsabs.harvard.edu/abs/2025AJ....170...94Z ↗
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/aj/170/94 ↗
catalogue entry · from IVOA Registry
Topics
- Stated by source
- Optical
- From keywords
- Astronomy & Astrophysics
- Inferred from text
- Image 75%
Provenance · 1 source records, 9 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| IVOA Registry (Virtual Observatory) | ivo://cds.vizier/j/aj/170/94 | 13 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[modality].ivoa_waveband:optical | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| concepts[modality].local:modality:image | enrichment · IVOA Registry | keyword-concept-rules@1.0.0 | title+description (75%) |
| 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 |