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Table A.5
Summary of historical spectral observations of ζ1 Sco.
| Date | Wavelength | Spectral | Comments | Reference |
| type | ||||
|
|
||||
| < 1896 | – | – | H β in emission | Pickering (1896) |
| 1891–1899 | 4000–4900 Å | B1p | P Cygni profiles in H β , γ | Cannon (1901) |
| all other lines in absorption | ||||
| (He i 4009, O ii 4349, C ii 4267) | ||||
| 1924 | 4100–4900 Å | B(2)eq | P Cygni profiles in H β , γ | Merrill et al. (1925) |
| H δ in absorption | ||||
| 1903–1929 | – | B1e Ia | – | Bidelman (1954) |
| 1926–1930 | 3950–4900 Å | B1pe | – | Rimmer (1930) |
| 30/07/34 | – | – | P Cygni profiles in H α and D3 He i | Merril & Burwell (1943) |
| < 1938 | – | – | Listed as variable | Payne-Gaposchkin & |
| Gaposchkin (1938) | ||||
| 1954–1958 | 3800–6600 Å | B1.5 Ia+ | No appreciable difference | Code & Houck (1958) |
| from Cannon (1901) | ||||
| 26/04/58 to 03/09/601 | 3900–4500 Å | B1e Ia | Buscombe et al. (1962) | |
| 22/08/61 | 6200–6600 Å | – | H α in emission | Jaschek et al. (1964) |
| 7/08/66 | 3800–4700 Å | B1 Iae | H β in emission, H γ , δ | Buscombe & Kennedy |
| & He i 4471 in absn. | (1968) | |||
| 6/07/60 | 3100–6750 Å | B1 Ia | P Cygni profiles in | Hutchings (1968) |
| 9/08/60 | Hα, β& He iλλ5876, 6678 | |||
| 10/08/60 | Remaining lines in absorption | |||
| 28/06/66 | Variability in Hα profile, but | |||
| 27/07/66 | no global spectral evolution | |||
| < 1969 | blue end | B1.5Ia | – | Schild et al. (1969) |
| 21/04/65, 20/05/67 | 3500–4900 Å | B1 Ia+ | P Cygni profiles in Hβ, γ | Jaschek & Jaschek |
| 18/03/68, 14/08/70 | Variable He i, N ii & O ii phot. lines | (1973) | ||
| 6/08/68 | 5800–6700 Å | – | P Cygni profiles in | Rosendhal (1973) |
| Hα, He iλλ5876, 6678 | ||||
| 16/05/73 to 10/07/73 | blue end | – | No apparent variability in spec. type | Hutchings et al. (1976) |
| 28/04/74 to 1/05/74 | 3800–4400 Å | B1.5 Ia + | No variability above 20% in | Walborn (1975) |
| 28/04/75 | line strength reported | |||
| 1974 Oct. & 1975 Mar. | ~ Hα | – | Variation in Hα P Cygni profile | Dachs et al. (1977) |
| 26/06/72 to 14/08/752 | 3400–6700 Å | B1Ia | Variable P Cygni profiles in | Sterken & Wolf |
| Hα, β & He iλλ5876, 6678 | (1978) | |||
| No secular evolution in spec. type | ||||
| < 1984 | 4300–4900 Å | B1.5 Ia+ | Variable P Cygni profiles in | Lopez & Walsh |
| 5500–6800 Å | Hα, β & He iλ6678 | (1984) | ||
| 19954 | 3450–8630 Å | B1.5 Ia+ | Variable P Cygni profiles in | Rivinius et al. (1997) |
| 1990 to 19943 | 4000–6740 Å | Hα, β, He iλ 6678 & Fe iii | ||
| Hγ, δ in absorption | ||||
| No changes in He i:Si iii ratio | ||||
| & hence spec. type | ||||
| 1998 Oct. 7 | 4000–8950 Å | B1.5 Ia + | H α , β , He i λ 6678 P Cygni, higher | This work |
| Balmer series in absorption | ||||
| 1999 June–July 5 | 4000–8950 Å | B1.5 Ia + | H α , β , He i λ 6678 P Cygni, higher | This work |
| Balmer series in absorption | ||||
| 2002 March–May6 | 5810–7205 Å | – | Variable Hα P Cygni | Morel et al. (2004) |
| 2003 May–June | 4000–7000 Å | B1.5 Ia+ | – | Crowther et al. (2006) |
| 2005 April 24 | 3800–6800 Å | B1.5 Ia+ | H α , β & He i λ 6678 P Cygni, higher | This work |
| Balmer series in absorption | ||||
| 2006 Feb. 16 | 3933–7985 Å | B1.5 Ia + | H α , β & He i λ 6678 P Cygni, higher | This work |
| Balmer series in absorption | ||||
| 2009 March 06 | 3060–5600 Å | B1.5 Ia + | H β P Cygni, higher Balmer | This work |
| series in absorption | ||||
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