Photoelectric photometry of the stars HD 29647 and HDE 283809 in the Taurus dark cloud |
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| Authors: | V Strai?ys K ?ernis D S Hayes |
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| Institution: | (1) Astrophysical Department, Institute of Physics, Lithuanian Academy of Sciences, Vilnius, Lithuania, U.S.S.R.;(2) Kitt Peak National Observatory, National Optical Astronomy Observatories, Tucson, Arizona, USA |
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| Abstract: | Photoelectric Vilnius photometry of the B-type stars HD 29 647 and HDE 283 809 in the direction of the Taurus molecular cloud indicates their brightness and energy distribution to be constant within 1–2%. The interstellar extinction law is determined for the star HDE 283 809 from the photometry data in the Vilnius andUBVRJHKL systems, which yield the ratioR=A
V/EB-V=3.5 and grain sizes exceeding the average by approximately 10%. The interstellar extinction law for the two stars is found to be the same in the infrared, however, it is very different in the near ultraviolet. The new spectra of HDE 283 809 confirm the earlier classification and indicate an absence of emission in the hydrogen lines. The interstellar band at 443 nm is observed but its intensity is a half of what is expected forE
B-V=1.61. The observed peculiarities of the energy distribution in the spectrum of HDE 283 809 apparently originate in interstellar or circumstellar dust, not in the star itself.Operated by the Association of Universities for Research in Astronomy, Inc., under contract with the National Science Foundation. |
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