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Theta CrB (COU610, HIP 76127, WDS15329+3122)

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#1 WRAK

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Posted 29 June 2013 - 02:33 PM

This star is listed as double in the Washington Double Star catalogue with 0.8" separation and +4.27/6.29mag for the components. The secondary is mentioned in the WDS notes as probably variable but period and amplitude of magnitude changes are not known it seems. This double should with the given data be easy resolvable with a 160mm scope but current observations indicate a limit of 200mm suggesting a delta-m of 3.5mag meaning the secondary would be about +7.8mag.
Any knowledge about this object in this forum?
Wilfried

#2 NJScope

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Posted 30 June 2013 - 05:53 PM

Theta CrB is listed in SIMBAD as a Be star. Be stars are known to be variables (short, medium and long-term). This fairly young binary system (200 Myr) apparently still has a debris disk. Although I did not find any other information regarding the variability of the secondary, the primary Theta CrB varies from Vmag 4.06 to 4.33. I hope this helps.

#3 WRAK

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Posted 01 July 2013 - 05:03 AM

Kevin, thanks. Would be very interested to get more info on the variability of the secondary. Seems to have been stable for a long period with a remarkable drop in brightness in the last months.
Wilfried






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