============================================================================ COMPOSITE OF OBSERVED SPECTRUM OF ALPHA BOOTIS Assembled 12-21-95 Alp Boo photometry file: photometry actually used to construct the spectrum Name FWHM Mag.+/-Unc. Eff Wvl Eff Wvl Flambda Source (Vega) (star) W/cm2/um (um) (um) (um) Kn 0.0488 -3.07 0.01 2.208 2.205 6.69E-13 Selby/Hammersley Ln 0.1443 -3.15 0.01 3.782 3.762 9.35E-14 Selby/Hammersley M 0.6677 -2.97 0.02 4.758 4.738 3.24E-14 Strecker et al. 1979 UKIRT87 0.8611 -3.13 0.01 8.770 8.779 3.43E-15 UKIRT Service data UKIRT98 0.9455 -3.16 0.01 9.843 9.828 2.23E-15 UKIRT Service data UKIRT11 1.1198 -3.16 0.01 11.641 11.639 1.15E-15 UKIRT Service data UKIRT12 1.1782 -3.19 0.01 12.432 12.427 9.13E-16 UKIRT Service data --------------------------------------------------------------------------- UKIRT filter set represents a series of narrowband 10 um passbands provided in common to UKIRT, Univ. Minnesota, and IRTF for "silicate" work. The "11" filter is centered near 11.7 um, the "12" filter is centered near 12.5 um. Spectral fragments and portions of these actually used in observed spectrum (``used" may include combination with other data where overlaps occur) Fragment Reference Total range Start and stop Average resolving (um) wavelengths (um) power NIR 1 1.22-5.70 1.22-5.58 50 KAO 2 3.65-9.39 4.44-8.99 150 8-13 3 7.65-13.43 7.65-13.43 55 LRS 4 7.80-22.70 9.30-21.90 30 LONG 5 15.73-23.85 15.73-23.85 73 VLONG 6 1.25-35.00 21.80-35.00 -- References: 1. Strecker, Erickson, and Witteborn 1979, Ap.J. Suppl., 41, 501. 2. FOGS data of May 11, 1992 KAO flight [alpha Boo/alpha Lyr], and HIFOGS data of April 14, 1995 KAO flight [alpha Boo/alpha Lyr]. 3. FOGS Mt Lemmon data of Feb. 24, 1992 [alpha Boo/alpha Lyr], CGS3 UKIRT data of May 24 and 29, 1991 [alpha Boo/beta Peg], August 12, 1995 [alpha Boo/beta Peg] and [alpha Boo/beta And]. The CGS3 spectra have the greatest weight on this combined data set. 4. LRS raw data extracted from the new Groningen IRAS database and recalibrated with ``LRSCAL" routine in ``GIPSY" package. 5. 20 um UKIRT CGS3 data of May 24/25, 1991 for [alpha Boo/beta Peg]. 6. Engelke Fn. used for T=4362K (see Blackwell, Lynas-Gray, and Petford 1991, A&A, 245, 567) and angular diameter=20.430 mas; we rescaled this to 21.12 mas. This Engelke Function was locked to the photometrically scaled combination of 8-13 and LRS spectra by splicing and used to replace the observations beyond 21.80 mu m. We applied an estimated uncertainty in EFn. of 2.4%, allowing for the change in shape of the EFn. for a temperature uncertainty of 100K at this effective temperature. INFORMATION ON SPLICES AND BIASES INCURRED Process Factor determined Bias (%) NIR cf. photometry 1.003 0.87 813 cf. photometry 1.031 0.45 LRS blue/red bias -- 0.03 LRS splice to 813 0.950 0.02 KAO joint splice to NIR and merged 813/LRS 0.862 0.41 LONG splice to merged 813/LRS 1.124 0.66 Engelke Fn. splice to combined 813/LRS/LONG 1.017 0.40 ============================================================================ Notes: 1. Composite spectra are NOT tabulated at equal intervals of the wavelength, but rather at the wavelengths of the original model. 2. In most cases "total uncertainty" is the error term most appropriate to use. It is the standard deviation of the spectral irradiance and includes the local and global biases. Local and global biases are given as a percent of the irradiance. The global bias does not contribute error to flux ratios or color measurements, and may, in those cases, be removed (in the RSS sense) from the total error. ============================================================================