HD 61827 – Spectral Analysis Astr 8600 Class Project Presentation Paramita Barai 8 th Dec, 2003
Background HD 61827 – Star in Cluster (NGC 2439) RA = 07h 39m 49.3s Dec = -32 34 42.1 B mag. = 8.11 V mag. = 7.66 Spectral Type: O8 / O9Ib (1997 A&A…323L..49P) B3 Ia (Turner, 1977 AJ…82..805T) I think B3 supergiant Parallax = 0.63 mas
Analysis Spectral Type No HeII in absorption Cooler than O supergiant Strong carbon doublet absorption B3 Supergiant
Single star with convective atmosphere Spectral lines varied by small amount & randomly H in emission – double peaked, randomly varying Convective wind flow around star, atmospheric turbulence Stellar absorption lines affected by the emission from gaseous envelope
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