Table · dataset · 2016
STELLA-SES Radial Velocities of HD 208472
Listed in IVOA Registry (Virtual Observatory)
HD 208472 is among the most active RS CVn binaries with cool starspots.
Description
Decade-long photometry had shown that the spots seem to change their longitudinal appearance with a period of about six years, coherent with brightness variations. Our aim is to spatially resolve the stellar surface of HD 208472 and related the photometric results to the true longitudinal and latitudinal spot appearance.
Furthermore, we investigate surface differential rotation pattern of the star. We employ three years of high resolution, high S/N spectroscopic data from the STELLA robotic observatory and determine new and more precise stellar physical parameters. Pre-calculated synthetic spectra are fit to each of these spectra and new spot-corrected orbital elements are given.
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A sample of 34 absorption lines per spectrum is used to calculate mean line profiles with a S/N of several hundred. A total of 13 temperature Doppler images are reconstructed from these line profiles with the inversion code iMap. Differential rotation is investigated by cross-correlating successive Doppler images in each observing season.
Spots on HD 208472 are distributed preferably at high latitudes and less occasionally around mid-to-low latitudes. No polar-cap like structure is seen at any epoch. We observed a flip-flop event between 2009 and 2010, manifested as a flip of the spot activity from phase 0.0 to phase 0.5, while the overall brightness of the star continued to increase and reached an all-time maximum in 2014.
Cross-correlation of successive Doppler images suggests a solar-like differential rotation which is ~15 times weaker in strength compared to the Sun.
Links
Where it is published
- Reference page cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/593/A123 ↗
landing page · from IVOA Registry
Documentation and papers
- ADS 2016A&A...593A.123O ui.adsabs.harvard.edu/abs/2016A%26A...593A.123O ↗
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/593/a123 ↗
catalogue entry · from IVOA Registry
Topics
- From keywords
- Astronomy & Astrophysics
- Inferred from text
- Image 65% · Longitudinal study 65%
Provenance · 1 source records, 9 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| IVOA Registry (Virtual Observatory) | ivo://cds.vizier/j/a+a/593/a123 | 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:longitudinal-study | enrichment · IVOA Registry | keyword-concept-rules@1.0.0 | title+description (65%) |
| concepts[modality].local:modality:image | enrichment · IVOA Registry | keyword-concept-rules@1.0.0 | title+description (65%) |
| 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 |