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Table A.6
Summary of the dates of historic spectral classifications of the Galactic BHGs.
| Publication | Observation |
| date | |
|
|
|
| HD 80077 (B2.5 Ia+) | |
| Morgan et al. (1955) | 1942–1955a |
| Buscombe & Kennedy (1968) | 1963–1967b |
| Nordstrom (1975) | <1975a |
| Moffat & Fitzgerald (1977) | <1977a |
| Knoechel & Moffat (1982) | 1977ab |
| Negueruela et al. (in prep.) | 2008 |
| HD 169454 (B1 Ia+) | |
| Morgan et al. (1955) | 1942–1955a |
| Hiltner (1956) | <1956 |
| Code & Houck (1958) | <1958 |
| Botto & Hack (1962) | <1962 |
| Hutchings (1970) | 1968 |
| Wolf & Stahl (1985) | 1972–1974 |
| Walborn (1980) | 1973–1975 |
| Hutchings (1976) | 1973–1975 |
| Rivinius et al. (1997) | 1992–1995b |
| Hanson et al. (1996) | 1994c |
| Hanson et al. (1998) | 1997c |
| Groh et al. (2007) | 2001–2004a |
| HD 190603 (B1.5 Ia+) | |
| Morgan et al. (1955) | 1942–1955 |
| Ahmad (1952) | <1952 |
| Hiltner (1956) | <1956 |
| Slettebak (1956) | <1956 |
| Lesh (1968) | <1968 |
| Hutchings (1970) | 1968 |
| Walborn (1971) | 1969 |
| Hutchings (1976) | 1973–1975 |
| Bisiacchi et al. (1976) | 1975–1976 |
| Andrillat et al. (1995) | 1988–1993 |
| Rivinius et al. (1997) | 1990–1199b |
| Lennon et al. (1992) | 1990 |
| Hanson et al. (1996) | 1994c,d |
| Blum et al. (1997) | 1996c,d |
| Hanson et al. (1998) | 1998c |
| Crowther et al. (2006) | 1992–2003 |
| Markova & Puls (2008) | <2007 |
| BP Cru (B1 Ia+) | |
| Vidal (1973) | 1973dd |
| Bord (1979) | 1974 |
| Hammerschlag-Hensberge et al. (1979) | 1975 |
| 1977 | |
| 1978 | |
| Parkes et al. (1980) | 1977–1978d |
| Kaper et al. (1995) | 1984 |
| Kaper et al. (2006) | 1996b |
| 2002b | |
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