Table · dataset · 1998
II Peg radial velocities
Listed in IVOA Registry (Virtual Observatory)
A detailed model atmosphere analysis of high-resolution and high S/N CCD spectra of IIPeg has yielded for the first time a self-consistent set of fundamental parameters of the primary component: T_eff_=4600K, logg=3.2, [M/H]=-0.4, {xi}_t_=2.0km/s.
Description
In addition, 121 new high quality radial velocity measurements allowed us to determine improved orbital parameters, resulting in a new orbital ephemeris of T_conj_=2449582.9268+6.724333E.
The position of the primary of II Peg in the HR diagram with the new parameters corresponds to a K2 IV star with mass =~0.8M_{sun}_. The evolved character of the star is confirmed by the C/N ratio, which is reduced significantly relative to the solar value. The unspotted V magnitude of the star of 6.9mag is estimated from the observed variations of the TiO bands and quasi-simultaneous photometry.
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The blend of LiI 6707{AA} is suspected to vary in equivalent width due to spot modulation. The lithium abundance for the unspotted star, Li/H=1.0+/-0.1, is found to be consistent with other post-main sequence chromospherically active stars. Combining all parameters, the radius R=~3.4R_{sun}_ and the inclination i=~60{deg} of the primary are estimated with the assumption that its rotational axis is perpendicular to the orbital plane.
The secondary is probably a M0-M3 V star with a mass of about 0.4M_{sun}_.
Links
Where it is published
- Reference page cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/334/863 ↗
landing page · from IVOA Registry
Documentation and papers
- ADS 1998A&A...334..863B ui.adsabs.harvard.edu/abs/1998A%26A...334..863B ↗
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/a%2Ba/334/863 ↗
catalogue entry · from IVOA Registry
Topics
- Stated by source
- Optical
- From keywords
- Astronomy & Astrophysics
- Inferred from text
- Stellar astronomy and planetary systems 78%
Provenance · 1 source records, 9 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| IVOA Registry (Virtual Observatory) | ivo://cds.vizier/j/a+a/334/863 | 14 d ago | JSON v1 |
| Field | Assertion | Extractor | Evidence |
|---|---|---|---|
| access_level | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| concepts[field].anzsrc:field:510109 | enrichment · IVOA Registry | taxonomy-embedding@1.1.0 | title+keywords+description (78%) |
| 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 |