Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009atel.2302....1s&link_type=abstract
The Astronomer's Telegram, #2302
Astronomy and Astrophysics
Astronomy
3
Radio, Infra-Red, X-Ray, Request For Observations, Binaries, Neutron Stars, Transients, Variables
Scientific paper
The currently active neutron star transient and atoll source Aql X-1 (Linares et al., ATEL #2288) has begun the transition from the hard (extreme island) state to the soft (banana) state (Rodriguez et al. ATEL #2299). This transition likely began around 2009 Nov 15 (MJD = 55150). The latest RXTE PCA observation (2009 Nov 17, MJD=55152.17+/-0.02, 2-60 keV fractional rms variability amplitude of ~11% for 0.1-10 Hz) indicates that the source is in the intermediate (island) state.
Altamirano Diego
Fox Ori
Linares Manuel
Miller-Jones James
Russell David
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