Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...149..429t&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 149, no. 2, Aug. 1985, p. 429-436.
Astronomy and Astrophysics
Astrophysics
40
A Stars, B Stars, Double Stars, Pre-Main Sequence Stars, Stellar Spectra, Astronomical Photometry, H Alpha Line, Interstellar Extinction, Spectral Energy Distribution, Stellar Atmospheres, Ultraviolet Spectra
Scientific paper
Results are given of a study of the stars HD 76534 and HD 163296 based on high-resolution spectra and photometric measurements through passbands ranging from 0.15 to 4.8 micrometers, to learn about their physical characteristics. Although Finkenzeller and Mundt (1984) consider them to be members of the Herbig Ae/Be pre-main sequence group, there are properties arguing against their membership. The H-alpha emission profile of Hd 76534 shows a central reversal shifted toward the red by +27 km/s, but the star does not show near-infrared excess in its spectral energy distribution. Hd 163296 is not associated with a young star-forming region, but a study of the profiles of its H-alpha emission line shows that the star has an expanding extended envelope where temperature changes take place. A study of the extinction characteristics in the UV part of their spectra shows that both stars have circumstellar matter with extinctions obeying an anomalous law that is completely different from the average law for the interstellar medium derived by Savage and Mathis (1978). Furthermore, the absorbed energy in the UV and the visual is not fully balanced by thermal re-emission of dust particles.
Cuypers H.
Felenbok Paul
Thé Pik-Sin
Tjin Djie R. E. H. A.
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