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Author Topic: Phase diagram for EG Cep taken on 4 nights  (Read 698 times)

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Offline Dave Smith

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Phase diagram for EG Cep taken on 4 nights
« on: 18:06:26, 06 January, 2017 »
After 4 clear nights in Dec and Jan I have enough data to plot the full phase diagram for the star EG Cep. I have been taking a 25 sec exposure of the star evry five minutes through a green filter (should be a V(visual) filter but don't yet have one) and Megrez 90 and Atik 460EX CCD camera. The resulting images are analysed using MaximDL to get the star magnitude using comparitive photometry and also the time and date (as the Julian date). The time period for this system is around 13 hours so it was not possible to observe the whole cycle in one go.
This very short time period indicates that the two stars are extremely close to each other and one at least is bulging towards the other due to the gravitational attraction. The large dip (at phase = 0) in brightness is when the lesser star comes in front of the other and the secondary dip (at phase = 0.5) is when it goes behind.

Dave
Website: http://astrosnaps.co.uk

Megrez 90, NEQ6, Atik 460EX M with Astrodon filters, DMK21 in finder guider, SkyShed POD. Celestron 9.25 for visual.
Software: SGPro with PHD2, Nebulosity4, MaximDL  and PS CS2.
Solar imaging:SkyWatcher ST120 with Daystar Quark Chromosphere, Rowan tilt adapter and ZWO ASI 174MM camera. Software: FireCapture, AS!2, Imppg and PS CS2.

Offline Uplooker

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Re: Phase diagram for EG Cep taken on 4 nights
« Reply #1 on: 18:14:16, 06 January, 2017 »
Wow Dave, that's a brilliant bit of work. Bet that took some dedication and clear nights.
Well done very impressive!


Sent from my iPhone using Tapatalk
Ian

Scopes: SW 150P Newt, ST80, Celestron C8 XLT, TAL 100RS / PST Stage 2 Mod & BF10, SW 300PDS (soon to be on a Dob Mount)
Cameras: SPC900, QHY5, Canon 450D, DMK31AU03.AS
Mounts: NEQ6 powered by EQMod, EQ3-2

Offline Dave Smith

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Re: Phase diagram for EG Cep taken on 4 nights
« Reply #2 on: 15:12:26, 07 January, 2017 »
Thank you Ian. I have now ordered a V filter so should be able to get results comparable with others.

Dave
Website: http://astrosnaps.co.uk

Megrez 90, NEQ6, Atik 460EX M with Astrodon filters, DMK21 in finder guider, SkyShed POD. Celestron 9.25 for visual.
Software: SGPro with PHD2, Nebulosity4, MaximDL  and PS CS2.
Solar imaging:SkyWatcher ST120 with Daystar Quark Chromosphere, Rowan tilt adapter and ZWO ASI 174MM camera. Software: FireCapture, AS!2, Imppg and PS CS2.

 

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