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News from variable stars' world and from our organisation
14. 3. 2010 :
MEDUZA | Our photometric data of V 407 Cygni from years 2002 - 2009.
We've processed the V, Rc and Ic photometric data of this target, we have obtained during year 2009. They cover time from April 09 till end of October 09. We have observed V407 Cygni in order to get photometric data for graduation thesis of Zuzana Fischerova, who study cold components of some selected symbiotic variables.
We have obtained about 100 measurments, which shows, that some significant brightening has started in September 2009. After some quiescent state during months April - August 2009, the object has brightened more than 1 mag during September and October 2009.
See the light curves here:
http://var2.astro.cz/EN/v407cyg.php
(Data are available upon request)
In comparison with optical behavior in years 2002 - 2005, the shape of LC in 2009 was different.
So according to our data, the outburst may began in September 2009. Unfortunelly we don't have data after October 31st 2009, which may tell us if the brightenning was beginnig of the main outburst or only some pre-outburst instability. Photometric data from period November 2009 - February 2010 are strongly needed.
> More information...
| 12. 3. 2010 :
TRESCA | New observing campaign: Search for HAT-P-13 c transit
> More information...
| 12. 3. 2010 :
TRESCA | New transiting exoplanet HAT-P-14 in Hercules
G. Torres, G. A. Bakos et al. has published another transiting exoplanet by HAT-Net. The targed is bright star in Hercules constelation 3086-00152 (V = 9.98), transits are 4,5 mmag depth and 131 minutes long. Orbital period 4.62 days.
For more information see the discovery paper:
HAT-P-14b: A 2 Jupiter-mass exoplanet transiting a bright F star
Object has been already added to ETD and TRESCA databases, so transit predictions are available now.
> More information...
| 8. 3. 2010 :
MEDUZA | GK Per is going to outburst. Based on last news from VSNET observers, this recurrent nova brighten up from its stable state (13,2 mag). GK Per showed two type of outbursts in the past: the first, when outburst duration was about two month and reached 4 mag high, and second, when outburst duration take only few days and its high was to 1,5 mag.
What type will be this outburst? Please, focus your equipment on this interesting object and send us your observation.
| 15. 2. 2010 :
WWW | Transfer of our web var2.astro.cz to another server of Czech astronomical society was done.
All funcion are now available for you. Observers can now continue in data submissions to observer logs and databases of B.R.N.O, MEDUZA, TRESCA projects.
Bugs should be reported to brat@pod.snezkou.cz
| 28. 12. 2009 :
TRESCA | AV CMi - eclipsing binary with transiting exoplanet?
A. Liakos and P. Niarchos has found periodic transit-like features in light curve of ecplipsing binary AV CMi (EA, Porb = 2.277751 d). The third object is orbiting one of the binary component on inner orbit with period P' = 0.5192237 days. Published orbital elements for transits are
Tmid = HJD 2454521.36315 + 0.5192237d * E
Transit duration is 3.3 hours (200 minutes) and the depth is about 2.6% (0.028 mag).
Apparent magnitude of AV CMi is about 11.5 mag and EB amplitude is 0.3 mag.
We have prepared predictions of the probably transit for observers here.
Results of preliminary study published by Liakos and Niarchos leads to a conclusion, that the third object must be a brown dwarf or hot jupiter exoplanet.
For more information see: A. Liakos, P. Niarchos, Preliminary results for the triple system AV CMi
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> Old records
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> Minima predictions < > Transits predictions <
New data MEDUZA & HERO:
CCD: L. Brát: V 407 Cyg, M. Lehký: SN2004et Cyg, SN2003gd Psc, SN2002ap Psc, SN2001bg Cnc, DX And, YY Her, V 1329 Cyg, V 2274 Cyg, V 1548 Aql,
VIZ: P. Dubovský: WY And, Z And, BB Aur, Eps Aur, NSV 16874 Aur, NSV 3171 Aur, Psi1 Aur, UU Aur, VW Aur, NSV 6696 Boo, V Boo, SY Cam, U Cam, XX Cam, BX Cas, KS Cas, NSV 332 Cas, NSV 650 Cas, Rho Cas, ST Cas,
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