Abstract
view Abstract Citations (65) References (52) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Redshifts of high-temperature emission lines in the far-ultraviolet spectra of late-type stars. Ayres, T. R. ; Stencel, R. E. ; Linsky, J. L. ; Simon, T. ; Jordan, C. ; Brown, A. ; Engvold, O. Abstract High-dispersion IUE spectra of six late-type stars exhibit small but statistically significant differential redshifts of high-temperature emission lines, like Si IV and C IV, with respect to low-temperature lines like S I and O I. A well-exposed, small-aperture spectrum of the active chromosphere binary Capella (Alpha Aurigae A: G6 II+F9 III) establishes that the high-temperature lines are redshifted in an absolute sense with respect to the accurately determined photospheric velocity of the system at single-line phase 0.50. Several possible explanations for the stellar redshifts are discused, including a warm wind (100,000 K) in which aparent redshifts are produced in optically thick lines by an accelerating outfow, and the downflowing component of a vertical circulation system for which the up-leg portion of the flow is too cool, too hot, or too tenuous to be visible in Si IV and C IV. If the second scenario is true, the stellar redshifts may provide an important phenomenological link to the downflows observed in 100,000 K species over magnetic active regions in the sun. Publication: The Astrophysical Journal Pub Date: November 1983 DOI: 10.1086/161493 Bibcode: 1983ApJ...274..801A Keywords: Emission Spectra; Far Ultraviolet Radiation; High Temperature; Late Stars; Line Spectra; Red Shift; Iue; Optical Thickness; Solar Activity; Solar Magnetic Field; Spaceborne Astronomy; Stellar Winds; Ultraviolet Spectra; Astrophysics full text sources ADS | data products SIMBAD (6) MAST (1) INES (1)
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
