All Tables

Table 1: Observational data for the sample of 20 Galactic B Supergiants. Spectral types and V magnitudes are taken from Lennon et al. (1992) for all stars except HD 192660, HD 185859, HD 190066 and HD 64760. The references for the spectral types of these 4 stars are as follows: HD 192660 from Walborn (1971); HD 185859 from Lesh (1968); HD 190066 from Hiltner (1956) and HD 64760 from Hoffleit & Jaschek (1982) (from which the V magnitude of HD 64760 was also taken). V magnitudes for the remaining 3 stars were obtained from Fernie (1983). Values of (B-V)₀ taken from Fitzgerald (1970). Absolute visual magnitudes, distance moduli and cluster associations have been taken from: 1. Brown et al. (1994), 2. Garmany & Stencel (1992) or 3. Humphreys (1978). For stars not associated with a cluster, an absolute visual magnitude scale based on spectral type (Egret 1978) was used. L1992 refers to archive data obtained from Lennon et al. (1992), INT2003 denotes data taken on the 2.5 m INT and RKP marks data supplied by Prinja.
Table 2: CMFGEN model atomic data, showing the number of full levels and superlevels treated as well as the number of bound-bound transitions considered for each ion included in a CMFGEN model.
Table 3: Fundamental parameters ( $T_{\rm eff}$ , log g, $\log\ (L/\mbox{$L_{\odot}$ })$ , R_*( $R_{\odot }$ ), E(B-V) M_V and $M_{\rm evol}$ ) derived for the sample of 20 Galactic B supergiants.Values of v $_{\rm e}$ sin i are taken from Howarth et al. (1997) and are expressed in km s^-1.
Table 4: Values of $T_{\rm eff}$ (expressed in terms of 10³ K) obtained in this thesis work and from Trundle et al. (2004); Kudritzki et al. (1999); McErLean et al. (1999); Trundle & Lennon (2005). Values marked with an asterisk denote where values from one author have been averaged and are quoted to 1 decimal place. $\dagger$ The B0.5 Ib star HD 64760 has been omitted here because it is a rapid rotator.
Table 5: Calibrations of fundamental parameters by spectral type for Galactic B supergiants, based on this work and that of Crowther et al. (2006).
Table 6: Derived CNO abundances for the sample of Galactic B supergiants (expressed as log $\left(\frac{N_{\rm x}}{N_{\rm H}}\right) + 12$ ). The amount of nitrogen enrichment relative to carbon and oxygen respectively is given in the last two columns, calculated as log $\left(\frac{N_{\rm x}}{N_{\rm H}}\right)_{*} -$ log $\left(\frac{N_{\rm x}}{N_{\rm H}}\right)_{\odot}$ .
Table 7: Comparison of mean published CNO abundances for OBA supergiants (expressed as log $\left(\frac{N_{\rm x}}{N_{\rm H}}\right) + 12$ ).
Table 8: Stellar wind parameters ( $\dot{M}$ , $\beta$ , $v_{\rm\infty }$ , $v_{\rm turb}$ ) derived for a sample of 20 Galactic B supergiants. The errors given on $\dot{M}$ reflect the errors in fitting each individual H $\alpha$ profile.