[vsnet-alert 9975] FWD from Sebastian Otero - AS 325 going into eclipse

[da55 at Safe-mail.net]

FORWARDED from SEBASTIAN OTERO who's having some email address issues with some mail lists :-

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The eclipsing ZAND star NSV 24607 = AS 325 (K2.5III+Be) in 
Sagittarius (seems to be entering a new eclipse according to 
ASAS-3 data:

<http://www.astrouw.edu.pl/cgi-asas/asas_plot_raw?185004-2624.3,asas3,0,700,350>

I think that this might be an interesting project for southern 
photometrists although the star is still a morning object.

This is a very complex system. Note the different amplitude, 
shape and duration of the eclipses. There is more than a couple 
of stars there...

The mean magnitude has been changing over the last years but 
maximum seems to have already been reached. The brighter the 
stars the deeper the eclipses seem to be.

This event would be a good oportunity to know more about this 
system. The hot star is a Be star and might be even adding to 
the variability. Multicolor photometry would help identifying 
which component is being eclipsed (although a gas cloud is 
obviously being eclipsed too) More data and info about the star 
can be found at: http://www.konkoly.hu/cgi-bin/IBVS?5608

A chart is available here:

http://ar.geocities.com/varsao/Carta_NSV_24607.htm

The period has been revised to 509 days after the 2005 eclipse 
but the secular changes makes it still uncertain within a couple  
of days. Also the total range is now V= 9.78 - 12.1.

Steve Howell (WIYN Observatory) has been following this star, 
Steve, if you're out there, are there some news about its 
nature?

No need to contact me about it, I just wanted to remind the 
community of the upcoming eclipse!

Best wishes,
Sebastian.

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