The Blue Bump in Spectral Line Bisectors

Details The Blue Bump in Spectral Line Bisectors The Blue Bump in Spectral Line Bisectors

Aug 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005jrasc..99r.129g&link_type=abstract

Journal of the Royal Astronomical Society of Canada, Vol. 99, No. 4, p.129

Astronomy and Astrophysics

Astronomy

Scientific paper

Most spectral lines in stellar spectra are slightly asymmetric. This asymmetry is conveniently expressed by using the bisector of the line. Bisectors of solar lines typically have a slightly distorted C shape, and many cool stars mimic the Sun. But there are very significant differences from one star to the next depending primarily on the vigor of the granulation and the structure of the star's atmosphere. The interesting relation discussed here is the coupling of the height of the "blue bump" (blue-most point on the bisector) with luminosity: the more luminous the star, the lower the blue bump. As a luminosity discriminant, the blue bump is about five times better than a standard spectral type classification. As a revealer of secrets about stellar atmospheres, it tells us that the brighter the star, the higher in the atmospheres the granulation penetrates. These results are based on observations taken at the Elginfield Observatory at UWO.

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