Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1972
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1972ap%26ss..15..236a&link_type=abstract
Astrophysics and Space Science, Volume 15, Issue 2, pp.236-239
Astronomy and Astrophysics
Astrophysics
3
Scientific paper
Continuous spectra of the Be objects HD 50138 and HD 51585 have been investigated between 1.6 and 1.2μ -1. The infrared gradientφ IR of HD 50138 (B5eV) is found to be 2.09±0.10, while the typical B5V star π And indicatesφ IR=1.17. A B5V (HD 16219) star located at about the same distance as HD 50138 hasφ IR=1.29 and it is shown that interstellar reddening may account forΔφ IR between HD 16219 and π And. The difference in gradient between HD 50138 and HD 16219 (Δφ IR=0.8) may be explained by a continuous reemission in a lenticular envelope with a radius equal to 4R *. The peculiar object HD 51585 exhibits a B0.5 continuous spectrum, for which the value d logI λ/d(1/λ) should be 1.13 according to model atmospheres computations. The distance as derived from color excess leads to disagreement between measured and computed (for a B0.5 star) values of d logI λ/d(1/λ). The reddening may be explained by reemission in an envelope the radius of which is smaller than 5R*. In conclusion, the narrowness of the spectral range under consideration does not permit to decide whether the observed reddening is due to recombination to the third level of the hydrogen atom or whether it is part a thermal reemission in a circumstellar cloud at lower temperature, as it has been observed around 10 μ by various authors.
Andrillat Yvette
Houziaux Léo
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