Table · dataset · 2022
giz photometry of stars in Cen I field
Listed in IVOA Registry (Virtual Observatory)
We report the detection of three RR Lyrae (RRL) stars (two RRc and one RRab) in the ultra-faint dwarf (UFD) galaxy CentaurusI (CenI) and two Milky Way (MW) {delta}Scuti/SX Phoenicis stars based on multi-epoch giz DECam observations.
Description
The two RRc stars are located within two times the half-light radius (r_h_) of CenI, while the RRab star (CenI-V3) is at ~6r_h_. The presence of three distant RRL stars clustered this tightly in space represents a 4.7{sigma} excess relative to the smooth distribution of RRL in the Galactic halo.
Using the newly detected RRL stars, we obtain a distance modulus to CenI of {mu}_0_=20.354{+/-}0.002mag ({sigma}=0.03mag), a heliocentric distance of D{sun}=117.7{+/-}0.1kpc ({sigma}=1.6kpc), with systematic errors of 0.07mag and 4kpc. The location of the CenI RRL stars in the Bailey diagram is in agreement with other UFD galaxies (mainly OosterhoffII). Finally, we study the relative rate of RRc+RRd (RRcd) stars (f_cd_) in UFD and classical dwarf galaxies.
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The full sample of MW dwarf galaxies gives a mean of f_cd_=0.28. While several UFD galaxies, such as CenI, present higher RRcd ratios, if we combine the RRL populations of all UFD galaxies, the RRcd ratio is similar to the one obtained for the classical dwarfs (f_cd_~0.3). Therefore, there is no evidence for a different fraction of RRcd stars in UFD and classical dwarf galaxies.
Links
Where it is published
- Reference page cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/162/253 ↗
landing page · from IVOA Registry
Documentation and papers
- ADS 2021AJ....162..253M ui.adsabs.harvard.edu/abs/2021AJ....162..253M ↗
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/aj/162/253 ↗
catalogue entry · from IVOA Registry
Topics
- From keywords
- Astronomy & Astrophysics
Provenance · 1 source records, 9 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| IVOA Registry (Virtual Observatory) | ivo://cds.vizier/j/aj/162/253 | 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:infrared | source · 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 |