Table · dataset · 2008
Optical spectral variability of BD+48 1220
Listed in IVOA Registry (Virtual Observatory)
Based on high-resolution observations (R=60000 and 75000), we have studied the optical spectral variability of the star BD+48 1220, identified with the IR-source IRAS 05040+4820.
Description
We have measured the equivalent widths of numerous absorption lines of neutral atoms and ions at wavelengths from 4500 to 6760{AA}, as well as the corresponding radial velocities. We use model atmospheres to determine the effective temperature Teff=7900K, surface gravity log g=0.0, microturbulence velocity xi_t_=6.0, and the abundances for 16 elements.
The star's metallicity differs little from the solar value: [Fe/H]=-0.10dex. The main peculiarity of the chemical composition of the star is a large He-excess, derived from the HeI 5876{AA} absorption, [He/H]=+1.04, and the equally large O-excess, [O/Fe]=+0.72dex. The C-excess is small, [C/Fe]=+0.09dex, and the ratio [C/O]<=1.
Read the rest (2 more)
We obtained a revised relation for the light-metal abundances: [Na/Fe]=+0.87 with [Mg/Fe]=-0.31. The barium abundance is low, [Ba/Fe]=-0.84. The radial velocity of the star measured from photospheric absorption lines over three years of observations varies in the interval V_{sun}_=-(7-15)km/s.
Time variable differential line shifts have been revealed. The entire set of available data (the luminosity Mv~-5mag, velocity V_lsr_~-20km/s, metallicity [Fe/H]=-0.10, and peculiarities of the optical spectrum and chemical composition) confirms the status of BD+48 1220 as a post-AGB star with He- and O-excesses belonging to the Galactic disk.
Links
Where it is published
- Reference page cdsarc.cds.unistra.fr/viz-bin/cat/J/AZh/84/714 ↗
landing page · from IVOA Registry
Documentation and papers
- ADS 2007AZh....84..714K ui.adsabs.harvard.edu/abs/2007AZh....84..714K ↗
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/azh/84/714 ↗
catalogue entry · from IVOA Registry
Topics
- Stated by source
- Optical
- From keywords
- Astronomy & Astrophysics
Provenance · 1 source records, 8 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| IVOA Registry (Virtual Observatory) | ivo://cds.vizier/j/azh/84/714 | 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 | |
| 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 |