Notes on the heavily reddened and variable A-type supergiant CD-33.12119 deg

Details Notes on the heavily reddened and variable A-type supergiant CD-33.12119 deg Notes on the heavily reddened and variable A-type supergiant CD-33.12119 deg

Aug 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...124..197v&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 124, no. 2, Aug. 1983, p. 197-205.

Astronomy and Astrophysics

Astrophysics

2

A Stars, Interstellar Extinction, Spectral Energy Distribution, Stellar Spectrophotometry, Supergiant Stars, Variable Stars, H Lines, Light Curve, Radial Velocity, Stellar Color, Ubv Spectra

Scientific paper

The results of photometric measurements (0.3 to 5 microns) and a spectroscopic study of the variable A2 Ia-type star CD-33.12119 deg are presented and discussed. The visual brightness variation of the star shows a peak-to-peak amplitude of about 0.2m and a characteristic period of about 35 d. The most striking phenomena of the visual spectrum are the extremely strong P Cygni profiles of H-alpha and H-beta. The extinction-free spectral energy distribution, up to about 5 microns, fits a theoretical Kurucz LTE model-atmosphere of T-eff = 10,000 K and log g = 1.5 satisfactorily. This is in agreement with the spectral type A2 Ia derived from line strength ratios. Strong interstellar absorption lines occur in the spectrum of CD-33.12119 deg, produced by the same interstellar material which causes a total visual extinction suffered by the star. A radial velocity of 30 km/s, determined using stellar Si II lines, indicates that the star is most probably a run-away object.

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