Presentation is loading. Please wait.

Presentation is loading. Please wait.

Using a DSLR to Study Variable Stars. Canon 450D - linear over a magnitude using RAW images with a specific setting.

Similar presentations


Presentation on theme: "Using a DSLR to Study Variable Stars. Canon 450D - linear over a magnitude using RAW images with a specific setting."— Presentation transcript:

1 Using a DSLR to Study Variable Stars

2 Canon 450D - linear over a magnitude using RAW images with a specific setting

3 Canon 85 mm fixed lens- can be used to do precise estimates down to magnitude 8 ( undriven ).

4 Canon 200 mm fixed lens- can be used to do precise estimates down to magnitude 10 ( undriven ).

5

6

7

8 Precision Photometry Eye: +/- 0.1 m Standard DSLR Photometry: +/- 0.03m Precise DSLR Photometry: +/- 0.01m

9 Precision Photometry The right settings for the right signal to noise ratio (SNR -100)

10 Precision Photometry Epsilon Aurigae & 85 mm lens: Exposure 5 secs,ISO 200, f5 Exposure 5 secs, ISO 200, f4.5 Exposure 5 secs:ISO 200. f4.

11 Precision Photometry Centered target stars The effect of wind Remote Switch Careful Focus Long Exposure Dark Frames

12 Standard DSLR Photometry +/- 0.03m ten images analysed

13 200 mm lens - exposure 3.2 secs, f2.8, ISO 800 images every ten/fifteen minutes

14 85 mm lens, exp 5 secs, f3.5, ISO 800

15 200 mm lens - exposure 2.5 secs, f2.8, ISO 800

16

17 Variations of 0.2/0.3 magnitude - a new world of variables

18 Precision DSLR Photometry +/- 0.01m thirty/ fifty images analysed

19

20

21 Estimates of the 20/2/10 JD: Camera Settings with an 85 mm lens: Exposure-5 seconds, ISO 200, f4. 5 sets of ten images: Analysed with AIP4WIN v (1) 3.776V (2) 3.777V (3) 3.774V (4) 3.769V (5) 3.781V Average = 3.775V Standard Deviation = 0.004

22 AIP4WIN - analysis of RAW images

23 Dark frames Flat Fields

24 Multi-image deep sky stacking procedure - 30 minutes to analyse 50 images

25 V Photometry Green Channel Images Transformation Co-efficient

26 Estimates of the 10/3/10 JD: Camera Settings with an 85 mm lens: Exposure-5 seconds, ISO 200, f4. 5 sets of ten images: Analysed with AIP4WIN v (1) 3.769V (2) 3.760V (3) 3.776V (4) 3.764V (5) 3.758V Average = 3.765V Standard Deviation = 0.007

27 Deciphering Epsilon Aurigae

28 Presentation of estimates

29 DSLR Cameras - not as sensitive as CCD cameras because they are not cooled - but yield just as good results down to mag 10.5


Download ppt "Using a DSLR to Study Variable Stars. Canon 450D - linear over a magnitude using RAW images with a specific setting."

Similar presentations


Ads by Google