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IX Dra: observations requested

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Jeremy's picture
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IX Dra: observations requested

IX Draconis is dwarf novae of the ER UMa type. The V magnitude of the star varies between 14.6-18.2 mag. It undergoes very frequent “normal” outbursts, with typical recurrence times in the range 3 to 4 days. Superoutbursts occur regularly with a supercycle length (Psc) of ~ 60 days. Studies have shown that the Psc is increasing.

Recent data from TESS have revealed the light curve of IX Dra in exquisite detail. However, for the next few months IX Dra will not be monitored by TESS. In the meantime, Stewart Bean (BAA VSS) and I are keen to get timings of the start of the next superoutburst (due early November) and possibly the one after that.

Please could observers add IX Dra to their target list. We are requesting one observation per night to get a light curve which will enable us to spot the normal and superoutbursts. Observations can be visual or CCD (Clear is fine, or V) .

Please submit your observations to either the BAA VSS database or the AAVSO’s.

Charts and sequences are available from the AAVSO website. IX Dra is located at RA 18 12 31.47 Dec +67 04 45.8 (J2000.0)

Many thanks in advance,

Jeremy Shears & Stewart Bean.

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Latest results from several observers

The graph summaries the results to date. 

There seem to have been three normal outbursts at 3-5 day intervals reaching 16.5 magnitude (V) at peak. The project is trying to time the next superoutburst to check the apparently regular 61+-2 day period suggested by TESS results. The next superoutburst is likely in the middle of November. If we can maintain observations at this frequency then we will have an uncertainly of only a day of two.  Thanks to all observers who have contributed. Bean data is courtesy of AAVSOnet.

Stewart and Jeremy

Jeremy's picture
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Thanks for the update,

Thanks for the update, Stewart. Certainly a lively star!

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IX Dra

Measured IX Dra at 15.650 CV this evening, 2020/10/22 21:07 UT.

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IX Dra update 23 Oct 2020

Thanks . That fits with the normal outbursts being about 5 days apart before a superoutburst. In the attachment from TESS data you can see the normal outbursts become more intense and 4-5 days separation. IX Dra never really goes into quiescence. Stewart

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Outburst

Yep, certainly in outburst   Oct 22.944    15.4  visual.

Gary