Instrumentation at the UC Centre for Astro-Engineering (AIUC)

Infante, L.; Guesalaga, Andrés; Vanzi, L.; Jordán, Alejandro; Padilla, N.; Guzmán, David

doi:10.22323/1.123.0250

Cited by 1 publication

(1 citation statement)

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“…The same distribution was found previously by other authors (Porter 1996;Slettebak 1982), with B2V being the most frequently observed spectral type in Be stars. BeSOS spectra were obtained using the Pontifica Universidad Catolica (PUC) High Echelle Resolution Optical Spectrograph (PUCHEROS) developed at the Center of Astro-Engineering of PUC (Infante et al 2010). The instrument is mounted at the ESO 50 cm telescope of the PUC Observatory in Santiago, Chile, and has a spectral range of 390-730 nm with a spectral resolution 1 http://besos.ifa.uv.cl 2 http://basebe.obspm.fr/basebe/ of λ/∆λ ∼ 18000.…”

Section: Sample and Data Reductionmentioning

confidence: 99%

Evidence for Different Disk Mass Distributions between Early- and Late-type Be Stars in the BeSOS Survey

Arcos

Jones

Sigut

et al. 2017

ApJ

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The circumstellar disk density distributions for a sample of 63 Be southern stars from the BeSOS survey were found by modelling their Hα emission line profiles. These disk densities were used to compute disk masses and disk angular momenta for the sample. Average values for the disk mass are 3.4×10 −9 and 9.5×10 −10 M ⋆ for early (B0-B3) and late (B4-B9) spectral types, respectively. We also find that the range of disk angular momentum relative to the star are between 150-200 and 100-150 J ⋆ /M ⋆ , again for early and late-type Be stars respectively. The distributions of the disk mass and disk angular momentum are different between early and late-type Be stars at a 1% level of significance. Finally, we construct the disk mass distribution for the BeSOS sample as a function of spectral type and compare it to the predictions of stellar evolutionary models with rapid rotation. The observed disk masses are typically larger than the theoretical predictions, although the observed spread in disk masses is typically large.

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Section: Sample and Data Reductionmentioning

confidence: 99%