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HD 61827 – Spectral Analysis Astr 8600 Class Project Presentation

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)

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HD 61827 – Spectral Analysis Astr 8600 Class Project Presentation

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  1. HD 61827 – Spectral AnalysisAstr 8600 Class Project Presentation Paramita Barai 8th Dec, 2003

  2. 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

  3. Spectra observed • KPNO Coude Feed Telescope • 2 observing runs : • Oct 2000 – 8 spectra • Dec 2000 – 17 spectra

  4. AnalysisSpectral Type • No HeII in absorption • Cooler than O supergiant • Strong carbon doublet absorption • B3 Supergiant

  5. 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

  6. Obs Times Abs Radial Centroid vel Eq width ISM (t-2451000) Velocity of H-alpha of H-alpha line (HJD, days) of star emisison emission velocity 817.99210 69.7607 -43.966999 0.111366 -0.264551 818.98270 68.9000 -98.056278 0.103513 0.358755 819.98540 66.3713 -2.7476891 0.193890 -0.798865 821.98710 66.0539 75.885895 0.509803 -1.67593 822.98540 68.5903 74.879163 0.579271 -1.49449 823.99210 73.2484 66.727690 0.665814 -0.413824 824.98560 83.2103 56.756792 0.777624 0.456484 831.00170 76.7857 70.034462 0.648179 -1.75772 889.92740 60.6403 176.53778 0.266625 -2.08747 890.94870 66.3107 164.15621 0.312579 -1.21548 893.92980 65.9936 163.25417 0.180265 -1.11643 894.90550 64.7917 146.39896 0.227874 -1.25792 895.97320 67.4618 121.18486 0.312627 -0.111312 896.89940 71.1799 96.059732 0.412994 0.254858 896.96770 71.9758 95.080074 0.431571 -0.906800 897.89470 67.6174 88.220027 0.386711 -1.05064 897.96250 67.0272 90.077823 0.393263 -0.834035 898.90690 66.4012 109.73705 0.307043 -1.22143 898.96910 66.8032 118.42820 0.297144 -0.566621 899.90060 65.2533 141.49436 0.270036 -1.88504 899.96300 64.0225 152.54472 0.224368 -1.82733 900.89390 65.7604 138.76702 0.413018 -0.250673 900.95610 65.7114 135.16257 0.437835 -0.237383 901.90210 75.3950 116.85906 0.432203 -0.0681385 901.96500 75.3741 111.83913 0.474489 0.00000

  7. Results • Single, B3 supergiant • Gaseous envelope around the star • Varied with ~ 5 days periodicity • More observations required to study the complex motions in the atmosphere accurately

  8. Thank you all

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