Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978afz....14..651o&link_type=abstract
Astrofizika, vol. 14, Nov. 1978, p. 651-663. In Russian.
Astronomy and Astrophysics
Astronomy
Early Stars, Hot Stars, Stellar Spectrophotometry, Ultraviolet Astronomy, A Stars, B Stars, Energy Spectra, Helium, Open Clusters, Stellar Models
Scientific paper
Results are presented for measurements of more than 190 UV spectrograms of 24 A2-B3 stars in Perseus, including 17 known members of the Alpha Per open cluster, which were obtained at wavelengths of 2200 to 3700 A from the Orion 2 space observatory. It is found that: (1) the UV continuum energy distribution (UV CED) of A0-B3 stars is essentially in good agreement with the Mihalas (1965) model atmospheres for the appropriate effective temperatures; (2) the UV CED of the B5 III-Ve star Psi Per deviates significantly from the theoretical curve shortward of 3000 A, possibly due to a circumstellar gas shell; (3) the UV CED of the B9 Ve star HD 21641 is not discrepant; (4) the UV CED of the helium-poor B8 III star HD 21699 corresponds to spectral type B5 III-V with an effective temperature of 15,700 K; and (5) the UV CED of the A2 star HD 21333 is in agreement with the Carbon-Gingerich (1969) model for an effective temperature of 9500 K with allowance for absorption-line blocking.
Oganesian Kh. R.
Vartanian K. V.
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