Spectroscopic parallaxes of MAP region stars from UBVRI, DDO, and uvbyH-beta photometry

Details Spectroscopic parallaxes of MAP region stars from UBVRI, DDO, and uvbyH-beta photometry Spectroscopic parallaxes of MAP region stars from UBVRI, DDO, and uvbyH-beta photometry

Nov 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990aj....100.1621p&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 100, Nov. 1990, p. 1621-1641. Research supported by the University of Arizona.

Astronomy and Astrophysics

Astronomy

15

H Beta Line, Reference Stars, Stellar Parallax, Stellar Spectrophotometry, Ubv Spectra, Interstellar Extinction, Stellar Luminosity, Stellar Spectra

Scientific paper

This paper presents the results of spectral type and luminosity classification of reference stars in the Allegheny Observatory MAP parallax program, using broadband and intermediate-band photometry. In addition to the use of UBVRI and DDO photometric systems, the uvbyH-beta photometric system was included for classification of blue (B - V less than 0.6) reference stars. The stellar classifications made from the photometry are used to determine spectroscopic parallaxes. The spectroscopic parallaxes are used in turn to adjust the relative parallaxes measured with the MAP to absolute parallaxes. A new method for dereddening stars using more than one photometric system is presented. In the process of dereddening, visual extinctions, spectral types, and luminosity classes are determined, as well as a measure of the goodness of fit. The measure of goodness of fit quantifies confidence in the stellar classifications. It is found that the spectral types are reliable to within 2.5 spectral subclasses.

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