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

Abstract

The circumstellar disk density distributions for a sample of 63 Be southern stars from the BeSOS survey were found by modeling their H α 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{sup −9} and 9.5 × 10{sup −10} M {sub ⋆} 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 is (150–200) J {sub ⋆}/ M {sub ⋆} and (100–150) J {sub ⋆}/ M {sub ⋆}, 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.

Authors:
; ;  [1]; ;  [2]
  1. Instituto de Física y Astronomía, Facultad de Ciencias, Universidad de Valparaíso. Av. Gran Bretana 1111, Valparaíso (Chile)
  2. Department of Physics and Astronomy, The University of Western Ontario, London, ON N6A 3K7 (Canada)
Publication Date:
OSTI Identifier:
22663508
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 842; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ANGULAR MOMENTUM; COMPARATIVE EVALUATIONS; DENSITY; EMISSION; FORECASTING; MASS; MASS DISTRIBUTION; ROTATION; SIMULATION; STARS

Citation Formats

Arcos, C., Kanaan, S., Curé, M., Jones, C. E., and Sigut, T. A. A. Evidence for Different Disk Mass Distributions between Early- and Late-type Be Stars in the BeSOS Survey. United States: N. p., 2017. Web. doi:10.3847/1538-4357/AA6F5F.
Arcos, C., Kanaan, S., Curé, M., Jones, C. E., & Sigut, T. A. A. Evidence for Different Disk Mass Distributions between Early- and Late-type Be Stars in the BeSOS Survey. United States. doi:10.3847/1538-4357/AA6F5F.
Arcos, C., Kanaan, S., Curé, M., Jones, C. E., and Sigut, T. A. A. Sat . "Evidence for Different Disk Mass Distributions between Early- and Late-type Be Stars in the BeSOS Survey". United States. doi:10.3847/1538-4357/AA6F5F.
@article{osti_22663508,
title = {Evidence for Different Disk Mass Distributions between Early- and Late-type Be Stars in the BeSOS Survey},
author = {Arcos, C. and Kanaan, S. and Curé, M. and Jones, C. E. and Sigut, T. A. A.},
abstractNote = {The circumstellar disk density distributions for a sample of 63 Be southern stars from the BeSOS survey were found by modeling their H α 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{sup −9} and 9.5 × 10{sup −10} M {sub ⋆} 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 is (150–200) J {sub ⋆}/ M {sub ⋆} and (100–150) J {sub ⋆}/ M {sub ⋆}, 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.},
doi = {10.3847/1538-4357/AA6F5F},
journal = {Astrophysical Journal},
issn = {0004-637X},
number = 1,
volume = 842,
place = {United States},
year = {2017},
month = {6}
}