Table · dataset · 2021
Spectroscopic follow-up of 100pc WDs in SDSS & Gaia
Listed in IVOA Registry (Virtual Observatory)
We present follow-up spectroscopy of 711 white dwarfs within 100pc, and we present a detailed model atmosphere analysis of the 100pc white dwarf sample in the Sloan Digital Sky Survey footprint.
Description
Our spectroscopic follow-up is complete for 83% of the white dwarfs hotter than 6000K, where the atmospheric composition can be constrained reliably. We identify 1508 DA white dwarfs with pure hydrogen atmospheres.
The DA mass distribution has an extremely narrow peak at 0.59M_{sun}_ and reveals a shoulder from relatively massive white dwarfs with M=0.7-0.9M_{sun}_. Comparing this distribution with binary population synthesis models, we find that the contribution from single stars that form through mergers cannot explain the overabundance of massive white dwarfs. In addition, the mass distribution of cool DAs shows a near absence of M>1M_{sun}_ white dwarfs.
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The pile-up of 0.7-0.9M_{sun}_ and the disappearance of M>1M_{sun}_ white dwarfs is consistent with the effects of core crystallization. Even though the evolutionary models predict the location of the pile-up correctly, the delay from the latent heat of crystallization by itself is insufficient to create a significant pile-up, and additional cooling delays from related effects like phase separation are necessary. We also discuss the population of infrared-faint (ultracool) white dwarfs and demonstrate for the first time the existence of a well-defined sequence in color and magnitude.
Curiously, this sequence is connected to a region in the color-magnitude diagrams where the number of white dwarfs with a helium- dominated atmosphere is low. This suggests that the infrared-faint white dwarfs likely have mixed H/He atmospheres.
Links
Where it is published
- Reference page cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/898/84 ↗
landing page · from IVOA Registry
Documentation and papers
- ADS 2020ApJ...898...84K ui.adsabs.harvard.edu/abs/2020ApJ...898...84K ↗
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/898/84 ↗
catalogue entry · from IVOA Registry
Topics
- Stated by source
- Optical
- From keywords
- Astronomy & Astrophysics
- Inferred from text
- Astronomical sciences 74%
Provenance · 1 source records, 9 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| IVOA Registry (Virtual Observatory) | ivo://cds.vizier/j/apj/898/84 | 15 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 (74%) |
| 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 |