[vsnet-chat 5691] Re: re CK Ori and W Ori tonight

["Sebastian Otero" <varsao@fullzero.com.ar>]

> Doug West noted:

> > Plotting the observations I measured part of the time between peaks with
> > the following results: 140, 670, 682, 391, 407, 408, 363, 413, 973, 671,
> > 469, 729, 399, and 617 days.  The GCVS gives a period of 212 days.  It
> > could be argued that most of the times between maxima correspond roughly
> > to a multiple of the 212 day GCVS period.  The average for the over 7000
> > observations was 6.51 and the standard deviation was 0.37 magnitude.
> > Taking three standard deviations either side of the mean gives a visual
> > range of 5.40 to 7.62.  W Ori is definitely near a maximum.

Yes, it is, but the separation between maxima in my lightcurve are 413%2 -
231 - 196? - 188? with seasonal gaps that don't allow a precise
determination but with a result of roughly 206 d. close to the published
period.


And John:

> Also to be noted is that W Ori was likely at maximum in its long cycle
> roughly a year ago, too.  I estimate the long cycle as being about 2360
> days using AFOEV data to hand, whilst Houk in AJ 68, 253 (1963)
> [adsabs.harvard.edu for downloadable copy] reckoned 2450 days.  I
> derived time of 'twin maximum' from the same AFOEV data, and the last
> subsequent time of long cycle maximum would have been about 330 days
> ago.

However, the shape of my lightcurve suggest W Ori is getting brighter and
that when I first observed it in January 1999 it was brighter (V= 5.5) than
it was after that and up to now.
It's strange that I can find a deep minimum exactly 330 days ago (V= 6.6)
not a maximum. Most of the observers noted it and that's why we started a
discussion on this star, so maybe John meant minimum instead of maximum?

Regards,
Sebastian.


---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://vsnet.grisoft.com).
Version: 6.0.423 / Virus Database: 238 - Release Date: 25/11/02

VSNET Home Page

Return to Daisaku Nogami

---

vsnet-adm@kusastro.kyoto-u.ac.jp