Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...107..326f&link_type=abstract
Astronomy and Astrophysics, vol. 107, no. 2, Mar. 1982, p. 326-332. Research supported by the Consiglio Nazionale delle Ricerch
Astronomy and Astrophysics
Astrophysics
14
H Lines, K Lines, Magnesium, Spectral Line Width, Stellar Spectra, Variable Stars, Chromosphere, Iue, Scutum Constellation, Stellar Oscillations, Ultraviolet Spectra
Scientific paper
IUE observations of seven Delta Scuti variables and a comparison star are reported with a comparison of the Mg II h and k lines to those of previously observed normal stars. Evident chromospheric emission is observed in three Delta Scuti variables: tau Cyg, beta Cas and rho Pup. Possible emissions are suggested for omega-1 Eri (F2III), iota Cyg, tau Peg, and kappa-2 Boo. Values of the observed emission widths fit well in diagrams of emission width-absolute magnitude, which, if correct, confirms the suggestion by Kondo et al. (1977) of possible evidence of chromospheric emissions in late A stars. A possible relation between emission widths and periods of pulsation is also discussed.
Fracassini Massimo
Pasinetti Laura E.
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