Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978mnras.183...55j&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 183, Apr. 1978, p. 55-59.
Astronomy and Astrophysics
Astronomy
3
Spectral Energy Distribution, Stellar Envelopes, Stellar Spectra, Supergiant Stars, Balmer Series, Chromosphere, H Lines, Interstellar Extinction, Stellar Atmospheres, Stellar Spectrophotometry
Scientific paper
The continuous energy distributions of the supergiant stars Rho Cas and Delta CMa observed over the wavelength range from 340 to 710 nm are compared. The observed distributions are converted to absolute units by using a calibration of Alpha Lyr, and the monochromatic magnitudes of Rho Cas and Delta CMa are corrected for interstellar reddening. A comparison of the energy distributions of the two stars for four nights indicates that the Paschen slope in Rho Cas is different from that in Delta CMa, the Balmer jump in Rho Cas is smaller than that in Delta CMa on all four nights, and the Balmer jump in Rho Cas is different on all four nights. It is suggested that the modifications in the energy-distribution curves of Rho Cas may be produced by the star's circumstellar cloud. The excess flux observed shortward of 410 nm in the spectrum of Rho Cas is tentatively attributed to hydrogen emission in the stellar chromosphere.
Joshi S. C.
Rautela B. S.
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