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Two far infrared cavities nearby asymptotic giant branch stars at the galactic plane

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Author Affiliations

  • 1Bhaktapur Multiple Campus, Tribhuvan University, Bhaktapur, Nepal
  • 2Central Department of Physics, Tribhuvan University, Kirtipur, Nepal

Res. J. Physical Sci., Volume 10, Issue (1), Pages 1-7, February,4 (2022)

Abstract

Dust color temperature, Planck function, visual extinction and their distributions of two far infrared cavities (named FIC06+00 and FIC21+48) found to be located within 30 around the AGB stars namely AGB0651+0031 and AGB2129+ 4919 at the galactic plane are presented. Dust color temperature of the core region of the cavities are found to be (20.5±1.2) K to (22.0±0.8) K and (22.1±0.1) K to (22.6±0.4) K respectively. The product of dust color temperature and visual extinction is found to be consistent in the order of 10-4. The distribution of Planck function along the extension (major diameter) and compression (minor diameter) is found to be non-uniform means dust particles are oscillating sinusoidally in order to get dynamical equilibrium which may be the cause of grain temperature. It further suggests that the dust particles in the cavities might not be in the thermal equilibrium possibly due to pressure driven events specially nearby AGB stars. Negative slope in transition from 25 µm to 60µm is our finding regarding far infrared spectral distribution in the cavities. It suggests that the number density of dust particles are found to be less than expected in 60 µm region.

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