Other
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002sass...21...87s&link_type=abstract
The Society for Astronomical Sciences 21st Annual Symposium on Telescope Science, held May 22-23, 2002, at Big Bear, CA. Publish
Other
Scientific paper
Discussion of ingenious indirect methods used to determine distances to stars and cosmic objects are covered to show the inaccuracy and large standard er- rors incurred when trying to determine distances beyond 300 light years (ly). Heliocentric and spectroscopic parallax and other methods are discussed and compared with parallaxes determined by the Hipparcos satellite. Hipparcos Catalogue parallaxes being ten times more accurate than previously achieved can be used to calibrate a visual surface brightness parameter (Fv) of EA- type eclipsing binaries. An EA-type binary with photometric and double-line spectroscopic orbits already determined along with the computed surface brightness parameter and a color index (V-R) can be used to calibrate the relation which can be used to determine the distance to the binary beyond the trigonometric stellar parallax capability. Observers using small telescopes and CCDs with proper filters can obtain the required color index (V-R). A list of 198 Hipparcos Catalogue stars without published absolute parameters are listed which needs the color index (V-R) determined. Eighteen detached and 8 semi-detached systems with known absolute parameters are also listed. Distances to 22 of these binary systems have been measured by Hipparcos Sat- ellite and can be used to help calibrate the validity of the relationship once the (V-R) has been determined on these 22 systems.
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