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Proposal Identication No.: A1730 Date Received: 2003-Oct-01 15:28:43
Technical Page
Proposal Type: Regular
General Category: Astronomy
Sub-Category: Spectroscopy
Observation Category: Galactic
Total Time Requested: 32.8 Hours
Proposal Title: High Brightness Temperature Phenomena in Active Stars: Testing Solar/Stellar
Connection
ABSTRACT:
We propose a new investigation of L-band bursts in dMe are stars and active binary systems with the upgraded
Arecibo Observatory. The increased bandwidth and sensitivity available with the L-wide receiver and WAPP
correlator will enable better constraint of the observable burst parameters: brightness temperature, relative
bandwidth, time duration, and levels of circular polarization. We can examine rapidly varying phenomena on time
scales of 5 milliseconds or greater, still retaining suфcient frequency resolution and sensitivity to characterize burst
properties and constrain possible emission mechanisms. The properties of soft X-ray and gyrosynchrotron emission
in dMe are stars and active binaries show more similarities to each other than to the Sun; they also show
apparently similar behavior of coherent phenomena at low frequencies. Better time-resolution observations are
necessary to determine whether the physical mechanism is the same, and to what extent solar coherent bursts can
be used as a template. Arecibo observations will be carried out in tandem with L- and X-band VLA observations
to conrm the stellar nature of L-band ares, and investigate multi-wavelength are correlations.
Name Institution E-mail Phone Student
Rachel A. Osten NRAO rosten@nrao.edu (434) 296-0259 no
Service Observing Request Remot e Observing Request
X None X No
All of the observing run. Maybe
Part of the observing run. Yes
Queue Observing
Instrument Setup
L-wide
Atmospheric Observation Instruments:
1

Special Equipment or setup: none
RFI Considerations
Frequency Ranges Planned
1150-1730
This proposal requires Iridium RFI protection at 1612 MHz between 10pm and 6am EST.
This proposal requires coordination with Punta Salinas radar within the band 1222-1381 MHz..
This proposal requires coordination with GPS L3 at 1381 MHz.
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