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Table A.4
Summmary of historical spectral observations of Cyg OB2 #12.
| Date | Wavelength | Spectral type | Comments | Reference |
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| ≤ 1954 | 4100–6600 Å | <A0 I | H α in emission | Morgan et al. (1954) |
| ≤ 1957 | 8–9000 Å | B5 Ia | – | Sharpless (1957) |
| ≤ 1970 | near IR | B8 Ia+ | – | Zappala (1970) |
| ≤ 1971 | ? | – | H α in emission | Bromage (1971) |
| ≤ 1973 | 5–8700 Å+ | – | Hα in emission | Chaldu et al. (1973) |
| 8–11 000 Å | ||||
| 1977 July | 3840–4480 Å | B8 Ia+ | Variable Hα | Souza & Lutz (1980) |
| +H α | in emission | |||
| 1980 Autumn | H α | – | H α in emission | Leitherer et al. (1982) |
| ≤ 1981 | 4000–6600 Å | – | H α +H β in emission | Hutchings (1981) |
| 1989–90 summer + | encompasses H α | B5 Ia | Hα+Hβ in emission, | Massey & Thompson (1991) |
| “few years earlier” | + ~ 4089–4686 Å | B5 Ia | Hγ+Hδ infilled | |
| 1990 August | 0.98–1.10 μm | > B3 Ia, < B8 Ia | – | Conti & Howarth (1999) |
| 1992 July | 0.98–1.10 μm | > B3 Ia, < B8 Ia | – | Conti & Howarth (1999) |
| 1992 July 17 | 4036–4836 Å | B4-5 Ia | H γ +H δ in absorption | This work |
| 5765–9586 Å | B3 Ia | H α in emission | ||
| 1994 Sept. | 2–2.2 μm | >B0.5 Ia, <B9 Ia | – | Hanson et al. (1996 ) |
| 1995 July 17 | 6366–6772 Å | – | H α in emission | This work |
| 1995 Dec. 23 | 2.35–8 μm | >B3 Ia, <B9 Ia | Brα, Pfα+β in emission | Whittet et al. (1997) |
| 1996 April 4 | 2.35–8 μ m | > B3 Ia, < B9 Ia | Br α , Pf α + β in emission | This work |
| 1996 Oct. 17 | 2.35–8 μm | >B3 Ia, <B9 Ia | Brα, Pfα+β in emission | Whittet et al. (1997) |
| 1997 June | 1.66–1.72 μm | >B1.5 Ia, <B8 Ia | – | Hanson et al. (1998) |
| 1998 Apr.–May | 2.35–8 μm | >B3 Ia, <B9 Ia | Brα, Pfα+β in emission | Lenorzer et al. (2002) |
| 1998 Aug. 09 | 3940–5737 Å | B4 Ia | H β in emission | This work |
| 6366–6772 Å | – | H α in emission | ||
| 1999 July 10 | 5500–7700 Å | B Ia | Hα in emission | Kiminki (2010, priv. comm.) |
| 2000 July 10 | 5500–7700 Å | B Ia | Hα in emission | Kiminki (2010, priv. comm.) |
| 2000 Sept. 18 | 3600–5200 Å | B3 Iae | Hβ infilled | Kiminki et al. (2007) |
| 2000 Sept. 23 | 4000–4750 Å | B4 Ia | H γ +H δ in absorption | This work |
| 6340–6740 Å | – | H α in emission | ||
| 2001 June 21 | 4542–7939 Å | B5 Ia | Balmer line emission | Klochkova & Chenstov (2004) |
| 2001 August 24 | 3800–4500 Å | B6 Iae | Hγ+Hδ in absorption | Kiminki et al. (2007) |
| 2001 Sept. 01 | 3800–4500 Å | B8 Iae | Hγ+Hδ in absorption | Kiminki et al. (2007) |
| 2003 April 12 | 5273–6764 Å | B5 Ia | Hα emission | Klochkova & Chenstov (2004) |
| 2007 Aug. 22 | 7600–8900 Å | B3 Ia | - | This work |
| 2007 Aug. 30 | 5600–6800 Å | B Ia | Hα in emission | Kiminki (2010, priv. comm.) |
| 2008 July 22 | 4000–5270 Å | B4 Ia | H β in emission | This work |
| H γ +H δ in absorption | ||||
| 6450–7150 Å | – | H α in emission | ||
| 8350–8900 Å | B3 Ia | |||
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