Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...139..521b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 139, no. 2, Oct. 1984, p. 521-528.
Astronomy and Astrophysics
Astrophysics
8
B Stars, Spectral Energy Distribution, Stellar Spectra, Stellar Spectrophotometry, Variable Stars, Absorption Spectra, Data Processing, Emission Spectra, H Beta Line, H Gamma Line, Helium, Radial Velocity, Stellar Models
Scientific paper
Fast spectroscopy of HR 9070 during two consecutive nights revealed rapid variations of the emission line ratios in Hβ and Hγ, the radial velocities, and the visibility of the helium lines and Mg II λ4481. There are indications of a 0.12-day period in addition to the photometric 0.31-day period (Percy, 1983). The situation is further complicated by individual, but not random, differences between various lines or groups of lines. The observations are discussed in terms of the oblique magnetic-rotator model advocated for HR 9070 by Harmanec (1984) and nonradial pulsation suggested by Percy (1983). The new spectroscopic observations of this paper favour a nonradial-pulsation model with possibly two modes.
Baade Dietrich
Bellas Y.
Eichendorf W.
Tomov Toma
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