Special charakteristics high rotation velocity „shell-line“ (Phases-dependent)

1. Hα observations on the Be binary HR2142 (HD41335; V0696 Mon)by Ernst PollmannVdS Spectroscopy Group Germany

2. 1

3. Special charakteristics • high rotation velocity • „shell-line“ (Phases-dependent) Phases dependent shell line 2

4. 3

5. 4

6. 5

7. periodic „gas-stream“ lines periodic „gas-stream“ lines 7 6 6

8. ORBITAL MOTION AND MASS FLOW IN HR 2142 V ≈ 25 – 75 km/s V ≈ – 20 km/s 8

9. Secondary Shell Phase (1,5d) 0.03 – 0.04 Observer Gas stream lines 9

10. Primary Shell Phase (5-8d) 0.7 – 0.98 Observer Gas stream lines 9

11. 9

12. 10

13. Campain 09/2007-04/2008 0.986 0.858 0.796 0.758 0.525 0.437 0.352 0.215 0.104 0.036 11

14. In dependence of phase the emission is seen either as blue- or red shifted V/R variation The central absorption core is developing between phase 0.75 - 1.0 In this phase section the secondary star is between observer and the Be-star 11

15. SC-telescope C14 20cm SC-telescope Self-build Slit-Grating Spectrograph Philips Webcam for guiding 12

16. 13

17. …thanks for attention….