Red Be Stars in the LMC and the SMC

DOI

We revisit the subject of Be candidate stars towards the Magellanic Clouds, previously studied by the authors using SPM4 proper motions. We obtain Gaia DR2 parallaxes and proper motions for 2357 and 994 LMC and SMC Be candidates, respectively. Parallaxes and proper motions versus colour V - I easily reveal the presence of the redder galactic contaminant foreground, as concluded in our previous work, but this time we do find a few red Be candidates consistent with being true Magellanic objects. A membership assessment to each Magellanic Cloud is done for each Be candidate, based on the distribution of their parallaxes and proper motions. From a compilation of published catalogues of spectroscopically confirmed emission line stars,we find that 41 (LMC) and 56 (SMC) of the Be candidates have shown the H{alpha} line in emission. Near-infrared IRSF JHKs magnitudes are obtained for about 70 per cent of the Be candidates with Gaia DR2 astrometric data. Mid-infrared SAGE IRAC 3.6, 4.5, 5.8, and 8.0 {mu}m magnitudes are obtained for about 85 per cent as well. After discarding possible Herbig Ae/Be stars, one LMC and three SMC B emission line confirmed stars show significantly redder optical, near and mid-infrared colours than what has been typically measured for Classical Be stars - they are called red Be stars. Taking into account that classical Be stars do not show these red colours, further studies about these four stars are needed in order to establish their true nature and explain the observed red excess.

Cone search capability for table J/MNRAS/505/5567/tablea1 (the LMC Be stars data used in this study)

Cone search capability for table J/MNRAS/505/5567/tablea2 (the four exceptionally red Be stars, ID = 909 is in the LMC and ID = 75, 184, and 547 are in the SMC)

Cone search capability for table J/MNRAS/505/5567/tablea3 (the SMC Be stars data used in this study)

Identifier
DOI http://doi.org/10.26093/cds/vizier.75055567
Source https://dc.g-vo.org/rr/q/lp/custom/CDS.VizieR/J/MNRAS/505/5567
Related Identifier https://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/505/5567
Related Identifier http://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/505/5567
Metadata Access http://dc.g-vo.org/rr/q/pmh/pubreg.xml?verb=GetRecord&metadataPrefix=oai_b2find&identifier=ivo://CDS.VizieR/J/MNRAS/505/5567
Provenance
Creator Vieira K.; Garcia-Varela A.; Sabogal B.; Rimulo L.R.; Hernandez J.
Publisher CDS
Publication Year 2024
Rights https://cds.unistra.fr/vizier-org/licences_vizier.html
OpenAccess true
Contact CDS support team <cds-question(at)unistra.fr>
Representation
Resource Type Dataset; AstroObjects
Discipline Astrophysics and Astronomy; Galactic and extragalactic Astronomy; Natural Sciences; Observational Astronomy; Physics; Stellar Astronomy