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Title:
Shock waves of large amplitude in the atmospheres of RR Lyrae stars?
Authors:
Gillet, D.; Burki, G.; Crowe, R. A.
Affiliation:
AA(Haute-Provence, Observatoire, Saint-Michel-l'Observatoire, France), AB(Geneve, Observatoire, Sauverny, Switzerland), AC(Hawaii, University, Hilo)
Publication:
Astronomy and Astrophysics (ISSN 0004-6361), vol. 225, no. 2, Nov. 1989, p. 445-455. Research supported by Canada-France-Hawaii Telescope Corp. (A&A Homepage)
Publication Date:
11/1989
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
BLUE STARS, CEPHEID VARIABLES, GIANT STARS, SHOCK WAVES, STELLAR ATMOSPHERES, ABSORPTION SPECTRA, H ALPHA LINE, LIGHT CURVE, STELLAR LUMINOSITY, STELLAR OSCILLATIONS, STELLAR SPECTROPHOTOMETRY
Bibliographic Code:
1989A&A...225..445G

Abstract

High-spectral resolution observations of the H-apha profile in the RR Ly star RX Eri are presented together with accurate light curves (Geneva photometric system) and a radial velocity curve deduced from metallic lines (Coravel). These new data show evidence that two weak H-alpha emission components occur respectively during hump and bump phases as in the RR LY star X Ari (Gillet and Crowe, 1988). If the Schwarzschild explanation for double H-alpha absorption lines is correct, it implies a high shock-front velocity (about 60 km/sec) and a supersonic infalling motion (about 50 km/sec), which produce a shock wave of large amplitude (about 110 km/sec). The above shock front velocity is significantly larger than that deduced from the radial velocity curve of metallic absorption lines.

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