Monster Black Hole Awakens After 26 Years
On 15 June 2015, a long-time acquaintance of X-ray and gamma ray astronomers made its comeback to the cosmic stage: V404 Cygni, a system comprising a black hole and a star orbiting one another. It is located in our Milky Way galaxy, almost 8000 light-years away in the constellation Cygnus, the Swan.
In this type of binary system, material flows from the star towards the black hole and gathers in a disc, where it is heated up, shining brightly at optical, ultraviolet and X-ray wavelengths before spiralling into the black hole.
Read the full story at ESA News
Newly discovered nova shells around cataclysmic variables!
Evidence of nova shells found around the NL, V1315 Aql, the dwarf nova, V1363 Cyg and evidence of a light echo around the nova V2275 Cyg, which could indicate it is a recurrent nova.
By authors: D. I. Sahman, V. S. Dhillon, C. Knigge, T. R. Marsh
ACTIVITY AT A GLANCE
New outbursts and unusual activity reported in the last 72 hours
Last updated 14:57 UT July 03, 2015
# indicates a noteworthy or unusual outburst
'Activity At A Glance' is gleaned from observations reported to AAVSO MyNewsFlash, BAAVSS-Alert, CVnet-Outburst, VSObs-share and VSNET-outburst. We sincerely thank all the observers who contribute timely observations and reports of activity to these email lists.
RECENT PAPERS ON CVs
For new papers on CV's see arxiv.org astro-ph
A remarkable recurrent nova in M31: Discovery and optical/UV observations of the predicted 2014 eruption
Authors: M. J. Darnley, M. Henze, I. A. Steele, M. F. Bode, V. A. R. M. Ribeiro, P. Rodríguez-Gil, A. W. Shafter, S. C. Williams, D. Baer, I. Hachisu, M. Hernanz, K. Hornoch, R. Hounsell, M. Kato, S. Kiyota, H. Kučáková, H. Maehara, J.-U. Ness, A. S. Piascik, G. Sala, I. Skillen, R. J. Smith, M. Wolf
Authors: V. V. Neustroev, S. V. Zharikov, N. V. Borisov
Extensive photometry of the WZ Sge-type dwarf nova V455 And (HS2331+3905): detection of negative superhumps and coherence features of the short-period oscillations
Author: V. P. Kozhevnikov
Authors: Polina Zemko, Koji Mukai, Marina Orio
Authors: Deanne L. Coppejans, Elmar G. Koerding, James C.A. Miller-Jones, Michael P. Rupen, Christian Knigge, Gregory R. Sivakoff, Paul J. Groot
Authors: D. I. Sahman, V. S. Dhillon, C. Knigge, T. R. Marsh
Authors: J. Shears, B. Gaensicke, P. Rodriguez-Gil, D. Boyd, G. Darlington, I. Miller
Authors: S. G. Parsons, C. Agurto-Gangas, B. T. Gaensicke, A. Rebassa-Mansergas, M. R. Schreiber, T. R. Marsh, V. S. Dhillon, S. P. Littlefair, A. J. Drake, M. C. P. Bours, E. Breedt, C. M. Copperwheat, L. K. Hardy, C. Buisset, P. Prasit, J. J. Ren
Authors: Linda Schmidtobreick, Michael Shara, Claus Tappert, Amelia Bayo, Alessandro Ederoclite
Authors: Tim O'Brien, Michael Rupen, Laura Chomiuk, Valerio Ribeiro, Michael Bode, Jennifer Sokoloski, Patrick Woudt
Author: John R. Thorstensen