On the constancy of spectral-line bisectors

Details On the constancy of spectral-line bisectors On the constancy of spectral-line bisectors

Apr 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983pasp...95..252g&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 95, April 1983, p. 252-255. Research supported by the N

Astronomy and Astrophysics

Astronomy

34

Convective Flow, Dwarf Stars, Line Spectra, Photosphere, Stellar Spectra, Stellar Temperature, Cool Stars, Giant Stars, Stellar Atmospheres, Stellar Spectrophotometry

Scientific paper

Bisectors of spectral line profiles in cool stars indicate the strength of convection in the photospheres of these objects. The present investigation is concerned with the feasibility of studying time variations in line bisectors, the reality of apparent line-to-line differences within the same stellar spectrum, and bisector differences between stars of identical spectral types. The differences considered pertain to the shape of the bisector. The material used in the investigation was acquired at the McDonald Observatory using a 1728 diode Reticon array at the coudefocus of the 2.1-m telescope. Observed bisector errors are discussed. It is established that different lines in the same star show significantly different bisectors. The observed error bands are shown by the shaded regions. The slope and curvature are unique for each case.

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