Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...337l..29s&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 337, Feb. 1, 1989, p. L29-L32. Research supported by NSERC and Er
Astronomy and Astrophysics
Astrophysics
14
Cepheid Variables, Infrared Spectroscopy, Peculiar Stars, Radial Velocity, Stellar Spectrophotometry, Line Spectra, Stellar Atmospheres, Stellar Magnitude, Visible Spectrum
Scientific paper
High-resolution spectra in the 1.1 micron region covering one complete pulsational period of the classical Cepheids X Sgr and Eta Aql show that all photospheric lines exhibit variable line asymmetries or doubling. This behavior resembles previously reported effects in the optical spectra of Cepheids, which suggest a peculiar velocity structure common to these stars. If the line asymmetries are not taken into account, the velocity curve has a systematically lower amplitude, which leads to a systematic underestimate of the radii and distance derived by the Baade-Wesselink method of 20-40 percent.
Fieldus Michael S.
Lester John B.
Sasselov Dimitar D.
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