Table · dataset · 2020
Asteroseismology of the WD GD358, 1982-2016
Listed in IVOA Registry (Virtual Observatory)
We report on the analysis of 34 years of photometric observations of the pulsating helium atmosphere white dwarf GD358.
Description
The complete data set includes archival data from 1982 to 2006, and 1195.2hr of new observations from 2007 to 2016. From this data set, we extract 15 frequencies representing g-mode pulsation modes, adding 4 modes to the 11 modes known previously.
We present evidence that these 15 modes are l=1 modes, 13 of which belong to a consecutive sequence in radial overtone k. We perform a detailed asteroseismic analysis using models that include parameterized, complex, carbon and oxygen core composition profiles to fit the periods. Recent spectroscopic analyses place GD358 near the red edge of the DBV instability strip, at 24000{+/-}500K and a logg of 7.8{+/-}0.08dex.
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The surface gravity translates to a mass range of 0.455-0.540M_{sun}_. Our best-fit model has a temperature of 23650K and a mass of 0.5706M_{sun}_. That is slightly more massive than what is suggested by the most recent spectroscopy.
We find a pure helium layer mass of 10^-5.50^, consistent with the result of previous studies and the outward diffusion of helium over time.
Links
Where it is published
- Reference page cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/871/13 ↗
landing page · from IVOA Registry
Documentation and papers
- ADS 2019ApJ...871...13B ui.adsabs.harvard.edu/abs/2019ApJ...871...13B ↗
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/apj/871/13 ↗
catalogue entry · from IVOA Registry
Topics
- From keywords
- Astronomy & Astrophysics
Provenance · 1 source records, 7 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| IVOA Registry (Virtual Observatory) | ivo://cds.vizier/j/apj/871/13 | 12 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 | |
| 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 |