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Seminario DAS: "Red Be stars in the Magellanic Clouds"

Red Be stars in the Magellanic Clouds

Red Be stars in the Magellanic Clouds

Enlaces relacionados
Departamento de Astronomía

Fecha:

Jueves 26 de noviembre de 2020

Hora:

12:15 hrs.

Lugar:

Virtual room (https://uchile.zoom.us/j/81365909464?pwd=aFYva3JpSXZUYnd0Z3o2OVZ6OS9GQT09)

Speaker: Dra. Katherine Vieira
Instituto de Astronomía y Ciencias Planetarias, Universidad de Atacama

Title: Red Be stars in the Magellanic Clouds

Abstract: 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 vs. color 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 catalogs of spectroscopically confirmed Be stars, we found that 41 (LMC) and 56 (SMC) of the Be candidates, are in fact Be confirmed stars. Near-infrared IRSF 𝐽𝐻𝐾𝑠 magnitudes were obtained for about 70% of the Be candidates with GAIADR2 astrometric data. Mid-infrared SAGE IRAC 3.6, 4.5, 5.8, and 8.0 𝜇m magnitudes were obtained for about 85% as well. Six (6) LMC Be confirmed stars show optical, near- and mid-infrared colors redder than what has been typically measured for Classical Be stars. Several of our Be candidates, in both LMC and SMC, follow this same trend, suggesting the existence of more Magellanic red Be stars, although in the SMC only two (2) Be confirmed stars show a redder color and not in all the filters considered.

Virtual room: https://uchile.zoom.us/j/81365909464?pwd=aFYva3JpSXZUYnd0Z3o2OVZ6OS9GQT09

Rene A. Mendez
Seminar Coordinator
DAS/UChile - rmendez@uchile.cl

Organiza
Departamento de Astronomía, Cerro Calán
Contacto
Alejandro Leal Obreque
+562 29771154 |

Departamento de Astronomía

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