Distance Determination For High Luminosity Stars Using The Extended Wilson-Bappu Effect.

Details Distance Determination For High Luminosity Stars Using The Extended Wilson-Bappu Effect. Distance Determination For High Luminosity Stars Using The Extended Wilson-Bappu Effect.

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21541319w&link_type=abstract

American Astronomical Society, AAS Meeting #215, #413.19; Bulletin of the American Astronomical Society, Vol. 42, p.253

Astronomy and Astrophysics

Astronomy

Scientific paper

In 1957, Olin Wilson and Vainu Bappu published evidence for a direct correlation between the width of the 3933A Ca K line emission core seen in late type stars, and the stellar absolute magnitude, Mv. In 1977, the third author on this abstract published a spectroscopic survey that showed the wing emission features seen in the broad wings of the K line among higher luminosity late type stars share a similar correlation of line width and Mv. Using a combination of newer McDonald Observatory high dispersion spectra and the VLT UVES spectral library, we have compiled new measurements including both core and wing emissions correlations along with Hipparcos parallaxes. We included different spectral type and luminosity subgroups, in order to examine any temperature dependent correlations, as has been discussed by Sid Parsons in a 2001 paper. We apply this method to new distance determinations for the hypergiant rho Cas (F8Iap) and AGB star R Lyr (M5 IIIe). We acknowledge partial support for this effort from the University of Texas summer REU program.

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