LXVII Congresso Annuale della Società Astronomica Italiana

Sessione

Oggetti variabili e transienti in astrofisica

4 mag 2026, 16:30

L'Aquila

169. L’Universo transiente nell’era multi-messaggera

Dr. Botticella, Maria Teresa (Istituto Nazionale di Astrofisica (INAF))

04/05/26, 16:30

L’astrofisica del dominio temporale e multi-messaggera rappresenta oggi una delle frontiere prioritarie della ricerca, come evidenziato dalle principali roadmap internazionali. I fenomeni transienti, che si manifestano su un’ampia gamma di energie e scale temporali, coinvolgono molteplici processi fisici la cui comprensione richiede un approccio integrato che combina le informazioni...

139. Pulsating variable stars as tracers of galaxy evolution

Dr. Monelli, Matteo (INAF - Osservatorio d'Abruzzo)

04/05/26, 16:55

Resolved stellar populations in Local Group galaxies provide fundamental information to understand galaxy formation and evolution, which can be constrained using their photometric, spectroscopic, and dynamical properties. Pulsating variable stars such cepheids and RR Lyrae star add extra constraints, as they trace the age and metallicity of the parent population.

In this talk I will show...

134. LSST e Gaia: una sinergia per la scala delle distanze basata su stelle variabili

Braga, Vittorio Francesco (Istituto Nazionale di Astrofisica (INAF))

04/05/26, 17:15

Nei prossimi dieci anni la Legacy Survey of Space and Time e le prossime Data Release di Gaia (DR4 e DR5) offriranno una sinergia irripetibile per lo studio delle variabili pulsanti nella Via Lattea e nel Gruppo Locale. La profondità e la copertura multi-banda (in sei filtri) di LSST, insieme alla precisione astrometrica di Gaia, rappresentano gli elementi chiave di questo filone di ricerca....

156. Ultra-long MeV transient from a relativistic jet: a tidal disruption event candidate

Ierardi, Annarita (Gran Sasso Science Institute)

04/05/26, 17:35

Gamma-ray bursts (GRBs) are extragalactic MeV transients lasting from fractions of a second to several minutes, typically associated with mergers of compact objects or the collapse of massive stars. On 2 July 2025, the Gamma-ray Burst Monitor onboard the Fermi Gamma-ray Space Telescope detected three emission episodes with overlapping sky localizations, occurring 1-2 hours apart, collectively...

144. High resolution spectroscopy of Classical Cepheids in the NIR

Salmeri, Laura (Istituto Nazionale di Astrofisica (INAF))

04/05/26, 17:50

Classical Cepheids (DCEPs) are the primary indicators for the extra-galactic distance scale. Establishing precise zero points for their Period-Luminosity and Period-Wesenheit (PLZ/PWZ) relations is crucial for resolving the 5σ H0 tension, yet current calibrations lack statistics for low-metallicity ([Fe/H] < -0.4 dex) and long-period (P > 10 days) pulsators. While metal-poor DCEPs exist at...

146. The identity card of Cepheids and RR Lyrae through the modeling of light and radial velocity curves

Molinaro, Roberto (Istituto Nazionale di Astrofisica (INAF))

04/05/26, 18:05

Classical Cepheids and RR Lyrae stars represent fundamental laboratories for testing stellar evolution and pulsation theories. Cepheids are young, intermediate-mass stars and primary standard candles for the extragalactic distance scale, while RR Lyrae stars are low-mass objects tracing old stellar populations. Both classes are characterized by radial pulsations, producing periodic variations...