Presentation is loading. Please wait.

Presentation is loading. Please wait.

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

Similar presentations


Presentation on theme: "HD 61827 – Spectral Analysis Astr 8600 Class Project Presentation Paramita Barai 8 th Dec, 2003."— Presentation transcript:

1 HD – Spectral Analysis Astr 8600 Class Project Presentation Paramita Barai 8 th Dec, 2003

2 Background HD – Star in Cluster (NGC 2439) RA = 07h 39m 49.3s Dec = -32   B mag. = 8.11 V mag. = 7.66 Spectral Type: O8 / O9Ib (1997 A&A…323L..49P) B3 Ia (Turner, 1977 AJ… T) 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

5

6

7 Analysis Spectral Type No HeII in absorption Cooler than O supergiant Strong carbon doublet absorption B3 Supergiant

8 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

9 Obs Times Abs Radial Centroid vel Eq width ISM (t ) Velocity of H-alpha of H-alpha line (HJD, days) of star emisison emission velocity

10

11

12 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

13 Thank you all


Download ppt "HD 61827 – Spectral Analysis Astr 8600 Class Project Presentation Paramita Barai 8 th Dec, 2003."

Similar presentations


Ads by Google