72,538 research outputs found
The star formation environment of the FU Ori type star V582 Aur
We have studied the environment of the FU Ori type star V582 Aur. Our aim is
to explore the star-forming region associated with this young eruptive star.
Using slitless spectroscopy we searched for H alpha emission stars within a
field of 11.5arcmin \times 11.5arcmin, centred on V582 Aur. Based on UKIDSS and
Spitzer Space Telescope data we further selected infrared-excess young stellar
object candidates. In all, we identified 68 candidate low-mass young stars, 16
of which exhibited H alpha emission in the slitless spectroscopic images. The
colour-magnitude diagram of the selected objects, based on IPHAS data, suggests
that they are low-mass pre-main-sequence stars associated with the Aur OB 1
association, located at a distance of 1.3 kpc from the Sun. The bright-rimmed
globules in the local environment of V582 Aur probably belong to the dark cloud
LDN~1516. Our results suggest that star formation in these globules might have
been triggered by the radiation field of a few hot members of Aur OB 1. The
bolometric luminosity of V582 Aur, based on archival photometric data and on
the adopted distance, is 150-320 Lsun.Comment: 10 pages, 8 figures, 3 tables. Accepted for publication by MNRA
Reading the Neural Code: What do Spikes Mean for Behavior?
The present study reveals the existence of an intrinsic spatial code within neuronal spikes that predicts behavior. As rats learnt a T-maze procedural task, simultaneous changes in temporal occurrence of spikes and spike directivity are evidenced in “expert” neurons. While the number of spikes between the tone delivery and the beginning of turn phase reduced with learning, the generated spikes between these two events acquired behavioral meaning that is of highest value for action selection. Spike directivity is thus a hidden feature that reveals the semantics of each spike and in the current experiment, predicts the correct turn that the animal would subsequently make to obtain reward. Semantic representation of behavior can then be revealed as modulations in spike directivity during the time. This predictability of observed behavior based on subtle changes in spike directivity represents an important step towards reading and understanding the underlying neural code
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