Table · dataset · 2024
Rotational velocities for LAMOST DR9 stars
Listed in IVOA Registry (Virtual Observatory)
In Data Release 9 of LAMOST, we present measurements of vsini for a total of 121698 stars measured using the Medium Resolution Spectrograph (MRS) and 80108 stars using the Low Resolution Spectrograph (LRS).
Description
These values were obtained through a {chi}^2^ minimization process, comparing LAMOST spectra with corresponding grids of synthetically broadened spectra. Due to the resolution and the spectral range of LAMOST, vsini measurements are limited to stars with an effective temperature (Teff) ranging from 5000 to 8500K for MRS and 7000 to 9000K for LRS.
The detectable vsini for MRS is set between 27 and 350km/s, and for LRS between 110 and 350km/s. This limitation is because the convolved reference spectra become less informative beyond 350km/s. The intrinsic precision of vsini, determined from multiepoch observations, is approximately ~4.0km/s for MRS and ~10.0km/s for LRS at a signal-to-noise ratio greater than 50.
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Our vsini values show consistency with those from APOGEE17, displaying a scatter of 8.79km/s. They are also in agreement with measurements from the Gaia DR3 and Sun+ 2021, J/ApJS/257/22 catalogs. An observed trend in LAMOST MRS data is the decrease in vsini with a drop in Teff, particularly transiting around 7000K for dwarfs and 6500K for giants, primarily observed in stars with near-solar abundances.
Links
Where it is published
- Reference page cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/271/4 ↗
landing page · from IVOA Registry
Documentation and papers
- ADS 2024ApJS..271....4Z ui.adsabs.harvard.edu/abs/2024ApJS..271....4Z ↗
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/apjs/271/4 ↗
catalogue entry · from IVOA Registry
Topics
- Stated by source
- Optical
- From keywords
- Astronomy & Astrophysics
- Inferred from text
- Astronomical sciences 70%
Provenance · 1 source records, 9 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| IVOA Registry (Virtual Observatory) | ivo://cds.vizier/j/apjs/271/4 | 14 d ago | JSON v1 |
| Field | Assertion | Extractor | Evidence |
|---|---|---|---|
| access_level | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| concepts[field].anzsrc:group:5101 | enrichment · IVOA Registry | taxonomy-embedding@1.1.0 | title+keywords+description (70%) |
| 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 | |
| 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 |