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2 Acta Astronomica

2 2016

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Variable Intensities of Molecular Features in the Spectrum of AE Aur

Krełowski J., Galazutdinov G. A., Mulas G., Bondar A., Musaev F. A., Shapovalova A., Cecchi-Pestellini C., Beletsky Y., Lee B. C.

Acta Astronomica

2016

Vol. 66, No. 3

391--403

Using spectra of the star AE Aur (HD 34078), covering the period 1997-2015, we suggest that two strong molecular features of CH and CH+ underwent detectable changes of intensity. In the last five years both CH and CH+ declined sharply and systematically, with the CH/CH+ ratio steadily growing. No variations in the radial velocities of the observed interstellar features was detected during the covered period.

Gray Extinction in the Orion Trapezium

Krełowski J., Galazutdinov G. A., Strobel A., Mulas G.

Acta Astronomica

2016

Vol. 66, No. 4

469--480

We estimated distances to several Orion Trapezium stars using our CaII-method and confirm the distance recommended by Menten et al. However, we found that in the case of HD 37020 both individual distances (based on the trigonometric VLBI parallax and/or CaII-method) differ from the spectrophotometric distance by a factor of 2.5. We interpret this fact as a result of presence of gray (neutral) extinction of about 1.8 mag in front of this star. The correctness of the applied spectral type/ luminosity class, Sp/L, (based on new original spectra from HARPS-N) and measurements of color indices is discussed