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Author Topic: Eclipsing binary star U Cep  (Read 486 times)

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Offline Dave Smith

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Eclipsing binary star U Cep
« on: 10:09:20, 27 May, 2017 »
A lovely clear night on Thursday. I have been trying to get the light curve for the eclipsing binary U Cep for the previous four nights. Strangely it is because it is relatively bright that has caused me problems. What I did on Tuesday night was all discarded because the star images were saturated after just 30s. Fortunately the software rejects any such images to prevent false readings. Wednesday night I tried 3 and 5 sec images and most of the 5s were rejected. Fortunately nothing much was happening then. Thursday night I did 2s images and caught the primary minimum when the dimmer secondary star comes in front of the primary. The reason the bottom of the minimum is flat is that the secondary star is smaller than the primary and so once it is in front of the primary there is no more dimming and it then brightens up as it leaves. This type of eclipsing binary is called an EA type. (The A stands for Algol type). The arrival of dawn prevented any further play.

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 psjshep

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Re: Eclipsing binary star U Cep
« Reply #1 on: 17:14:31, 27 May, 2017 »
Another great write-up & set of results, Dave....  and an all-nighter too :thumbup:

Thanks for sharing...

Phil
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Offline Dave Smith

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Re: Eclipsing binary star U Cep
« Reply #2 on: 17:26:30, 27 May, 2017 »
Thanks Phil. Most of the time this star is constant at around mag 7. It's period is 2.49 days so it is quite tricky to catch the minimum. Fortunately one can get forecasts of when they happen from the BAAVSS website. Iwould like to get the secondary minimum when the secondary star disappears behind the primary. I have no idea how deep that is.

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 Nomis Elfactem

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Re: Eclipsing binary star U Cep
« Reply #3 on: 20:42:09, 27 May, 2017 »
Yeap, really great effort Dave !!
S.
Simon

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Cameras: SXVF H694, Atik 16ic, Canon EOS 600d, DMK41, DMK21, QHY 5L-II (mono & colour)
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Offline Dave Smith

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Re: Eclipsing binary star U Cep
« Reply #4 on: 21:08:24, 27 May, 2017 »
Thanks Simon

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.

Online Nimbus

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Re: Eclipsing binary star U Cep
« Reply #5 on: 06:41:48, 28 May, 2017 »
Good effort Dave. Unlike most of us who just try to generate "pretty pictures" you appear to be doing work which borders on real science well done. ATB Jim
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Offline Dave Smith

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Re: Eclipsing binary star U Cep
« Reply #6 on: 17:35:15, 28 May, 2017 »
Good effort Dave. Unlike most of us just try to generate "pretty pictures" you appear to be doing work which borders on real science well done. ATB Jim
Thanks Jim. That is my motivation precisely. Some of my data has been used by professionals :-)

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 chris.bailey

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Re: Eclipsing binary star U Cep
« Reply #7 on: 06:36:51, 29 May, 2017 »
Fascinating graph Dave and as Jim says, proper science and stuff.

Chris
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Offline Dave Smith

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Re: Eclipsing binary star U Cep
« Reply #8 on: 10:14:43, 29 May, 2017 »
Thank Chris. :-)

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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