Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984afz....21..111r&link_type=abstract
(Astrofizika, vol. 21, July-Aug. 1984, p. 111-124) Astrophysics (ISSN 0571-7132), vol. 20, no. 4, Jan. 1985, p. 419-427. Transla
Astronomy and Astrophysics
Astrophysics
3
Continuous Spectra, Early Stars, Spectral Energy Distribution, Stellar Spectrophotometry, Absorption Spectra, Balmer Series, Chemical Composition, Red Shift, Stellar Atmospheres, Stellar Gravitation, Stellar Luminosity, Stellar Rotation, Stellar Temperature
Scientific paper
The accuracy of the spectral subclassifications of early MK stars is studied through comparison of continuum measurements. The measurements were carried out by the USSR Academy of Sciences expedition to Chile in 1978. The spectral parameters used in the comparison included Balmer line jumps; spectrophotometric gradients; and Q-lambda curves. It is shown that normal stars in a given subclass can have very different continuum spectra due to differences in both the physical conditions in the stellar atmospheres, as well as external factors such as the presence of external envelopes. On the basis of the observed differences in the continuum spectra, it is concluded that MK classifications based on continuum measurements may be less reliable than has previously been assumed.
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