천문학회지 (Journal of The Korean Astronomical Society)

  • 제39권3호
  • /
  • Pages.73-80
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  • 2006
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  • 1225-4614(pISSN)
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  • 2288-890X(eISSN)
한국천문학회 (The Korean Astronomical Society)
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ON THE HOMOGENEITY OF THE EXTINCTION LAW IN OUR GALAXY

  • 발행 : 2006.09.30
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초록

We analyze the extinction law towards several B1V stars-members of our Galaxy, searching for possible discrepancies from the galactic average extinction curve. Our photometric data allow to build extinction curves in a very broad range: from extreme UV till infrared. Two-colour diagrams, based on the collected photometric data from the ANS UV satellite, published UBV measurements and on the infrared 2MASS data of the selected stars, are constructed. Slopes of the fitted straight lines are used to build the average extinction curve and to search for discrepant objects. The selected stars have also been observed spectroscopically from the Terskol and ESO Observatories; these spectra allow to check their Sp/L's. The spectra of only about 30% of the initially selected objects resemble closely that of HD144470, considered as the standard of B1 V type. Other spectra either show some emission features or belong clearly to another spectral types. They are not used to build the extinction curve. Two-colour diagrams, constructed for the selected B1 V stars, showing no emission stellar features, prove that the interstellar extinction law is homogeneous in the Galaxy. Both the shape of the curve and the total-to-selective extinction ratio do not differ from the galactic average and the canonical value(3.1) respectively. The circumstellar emissions usually cause some discrepancies from the average interstellar extinction law; the discrepancies observed in the extraterrestrial ultraviolet, usually follow some misclassifications.

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참고문헌

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피인용 문헌

  1. On the relationship between the continuum of interstellar extinction curves, the 2200 Å bump, and the diffuse interstellar bands 2017, https://doi.org/10.1002/asna.201713308
  2. The extinction curve in the visible and the value ofRV vol.333, pp.2, 2012, https://doi.org/10.1002/asna.201111644
  3. Limited diversity of the interstellar extinction law vol.333, pp.1, 2012, https://doi.org/10.1002/asna.201111632
  4. The 2200 Å bump and the interstellar extinction curve vol.334, pp.10, 2013, https://doi.org/10.1002/asna.201211901
  5. The extinction curve in the visible and the value ofRV: Addendum to AN 333, 160 vol.333, pp.7, 2012, https://doi.org/10.1002/asna.201211697