The ultraviolet spectra of Alpha Aquilae and Alpha Canis Minoris

Details The ultraviolet spectra of Alpha Aquilae and Alpha Canis Minoris The ultraviolet spectra of Alpha Aquilae and Alpha Canis Minoris

Mar 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...212..438m&link_type=abstract

Astrophysical Journal, Part 1, vol. 212, Mar. 1, 1977, p. 438-445. Research supported by the Consejo Nacional de Investigacione

Astronomy and Astrophysics

Astronomy

22

Binary Stars, Satellite Observation, Spaceborne Astronomy, Stellar Spectra, Ultraviolet Spectra, Absorption Spectra, Astronomical Models, Oao 3, Red Shift, Rocket Flight, Stellar Spectrophotometry

Scientific paper

Scans of Alpha Aql (A7 IV, V) and Alpha CMi (F5 IV-V) obtained with the Copernicus satellite spectrometer over the wavelength range from 2100 to 3200 A are presented along with a spectrum of the integrated solar disk over the same range procured during a calibrated rocket flight. About 1500 fairly strong absorption lines in the Alpha CMi spectrum between 2400 and 2961 A are identified by comparison with a solar atlas and by using a theoretical spectrum synthesized from a blanketed LTE model with an effective temperature of 6500 K and a surface gravity of 10,000 cm/sec per sec. The Mg II resonance doublet at 2795.528 and 2802.704 A is found to be present in all three stars together with a discontinuity at 2635 A due to Fe II, Fe I, Cr I, and Mn II. It is concluded that the Mg II resonance lines and the 2635-A continuum break would be the best spectral features for estimating the redshift of a galaxy observed at low resolution provided the redshift is not less than about 0.75.

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