La stella LBV (luminous blue variable) GR290 in M33, tenuta sotto controllo dalla nostra associazione, ha raggiunto un nuovo minimo di luminosità: rispetto al massimo avuto a Gennaio 2011, ora la stella è circa una magnitudine più debole su tutte le bande ottiche.
We study the characteristics of a narrow band type Ia supernova survey
through simulations based on the upcoming Javalambre Physics of the
accelerating universe Astrophysical Survey (J-PAS). This unique survey
has the capabilities of obtaining distances, redshifts, and the SN type
from a single experiment thereby circumventing the challenges faced by
the resource-intensive spectroscopic follow-up observations. We analyse
the flux measurements signal-to-noise ratio and bias, the supernova
typing performance, the ability to recover light curve parameters given
by the SALT2 model, the…
We present time-series photometric and spectroscopic data for seven old
novae. They are used to derive the orbital period for the systems: V365
Car (5.35 h), AR Cir (5.14 h), V972 Oph (6.75 h), HS Pup (6.41 h), V373
Sct (3.69 h), V909 Sgr (3.43 h) and CN Vel (5.29 h). Their addition
increases the number of orbital periods for novae by ˜10 per cent.
The eclipsing nature of V909 Sgr is confirmed, and in three other cases
(V365 Car, Ar Cir and V373 Sct) we detect significant photometric
orbital variability with amplitudes ≥0.2 mag in R. The resulting
period distribution is briefly discussed….
Si invita la S.V. all’Assemblea Ordinaria dei Soci che si terrà in prima convocazione il giorno 29/10/2013 alle ore 23.55 presso l'ufficio di Manlio Ercolino in via Carlo Emanuele I n°12a e, qualora mancasse il numero legale, in seconda convocazione il giorno 30/10/2013 alle ore 18.00 presso lo stesso luogo per discutere e deliberare sul seguente
We present time-series photometric and spectroscopic data for seven old
novae. They are used to derive the orbital period for the systems: V365
Car (5.35 h), AR Cir (5.14 h), V972 Oph (6.75 h), HS Pup (6.41 h), V373
Sct (3.69 h), V909 Sgr (3.43 h) and CN Vel (5.29 h). Their addition
increases the number of orbital periods for novae by ˜10 per cent.
The eclipsing nature of V909 Sgr is confirmed, and in three other cases
(V365 Car, Ar Cir and V373 Sct) we detect significant photometric
orbital variability with amplitudes ≥0.2 mag in R. The resulting
period distribution is briefly discussed….
