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| » | INTEGRAL_SPIACS trigger 5506-0
Possible GRB The event time is 2009-04-25T09:05:16 UT. Location RA 0.1193 Dec 0.0518 (J2000) |
| » | SWIFT_XRT_Position trigger 350311-0
Possible GRB The event time is 2009-04-24T14:45:29 UT. Location RA 189.52 Dec 16.836 (J2000) uncer ... |
| » | SWIFT_UVOT_Darkburst trigger 350311-0
Possible GRB The event time is 2009-04-24T14:30:48 UT. Location RA 189.52 Dec 16.843 (J2000) |
| » | SWIFT_UVOT_Darkburst_proc trigger 350311-0
Possible GRB The event time is 2009-04-24T14:30:48 UT. Location RA 189.52 Dec 16.843 (J2000) |
| » | SWIFT_UVOT_Findchart trigger 350311-0
Possible GRB The event time is 2009-04-24T14:29:28 UT. Location RA 189.52 Dec 16.843 (J2000) |
Date published: not known
 | North 43o 54' 57" West 78o 34' 59" 95m ASL MPC Observatory Code H61 Global Telescope Network Partner GTN-33 |
Friday 17 April 2009
Variable Star Campaign Underway
Michael Cook,Friday 17 April 2009 - 03:25:14 //Comments are turned off for this item
Observations have been requested of the following variable stars. Photometric monitoring using a CCD began on the dates shown.
BG Gem (2009-03-02)
BG Geminorum is a long period eclipsing binary system (Porb ∼ 90 days); currently the nature of the primary is uncertain. Recent observational evidence indicate that the primary star is a black hole. If so, BG Geminorum would be the black hole binary system with the largest orbital period, by an factor of 3, as well as being the only known eclipsing black hole binary system in the Galaxy.
Yz Cnc (2009-03-05)
Dr. Christian Knigge, University of Southampton, England, has requested monitoring dwarf novae cataclysmic variables as part of a search for radio jet formation during outbursts. Dr. Knigge is attempting to observe a dwarf nova outburst within six hours of the outburst onset using the NRAO Very Large Array (VLA) telescope in New Mexico and the Jodrell Bank MERLIN telescope in the United Kingdom. Rapid optical detection of an outburst onset will be used to trigger target-of-opportunity (TOO) observations with both radio telescopes to study the behavior of dwarf novae outbursts in the radio region of the spectrum, and to determine whether CV systems are capable of forming radio jets similar to those observed in X-ray bursters and other X-ray binaries. Yx Cnc is one of ten targets.
SDSS J102347.68+003841.2 (2009-04-16)
Anne Archibald (McGill University) and collaborators request long-term monitoring of the transient source SDSS J102347.68+003841.2 (== FIRST J102347.6+003841). This object is a known ellipsoidal variable (V ~17.3-17.8) consisting of a neutron star primary and a 0.2 solar mass secondary, with a binary period of 0.198 days. While the known ellipsoidal variation is understood to be a combination of tidal
deformation of the secondary and heating of the side closer to the primary, the system was also observed to go into optical outburst in
2001, increasing in optical flux by a factor of 4 (~1.5 magnitudes), suggesting that a mass transfer episode occurred. The neutron star is a
known pulsar, and the system is described as a "radio-selected cataclysmic variable"; the intermittent accretion may indicate that this
is a very evolved low-mass X-ray binary. Currently (as of 2009 April) the system does not appear to be active, and no sign of an accretion
disk is seen. Long-term monitoring of this faint star for future outbursts of a similar nature is requested. Future outbursts will trigger X-ray and radio observations of this source to better understand the evolution of neutron star binary systems.
BG Gem (2009-03-02)
BG Geminorum is a long period eclipsing binary system (Porb ∼ 90 days); currently the nature of the primary is uncertain. Recent observational evidence indicate that the primary star is a black hole. If so, BG Geminorum would be the black hole binary system with the largest orbital period, by an factor of 3, as well as being the only known eclipsing black hole binary system in the Galaxy.
Yz Cnc (2009-03-05)
Dr. Christian Knigge, University of Southampton, England, has requested monitoring dwarf novae cataclysmic variables as part of a search for radio jet formation during outbursts. Dr. Knigge is attempting to observe a dwarf nova outburst within six hours of the outburst onset using the NRAO Very Large Array (VLA) telescope in New Mexico and the Jodrell Bank MERLIN telescope in the United Kingdom. Rapid optical detection of an outburst onset will be used to trigger target-of-opportunity (TOO) observations with both radio telescopes to study the behavior of dwarf novae outbursts in the radio region of the spectrum, and to determine whether CV systems are capable of forming radio jets similar to those observed in X-ray bursters and other X-ray binaries. Yx Cnc is one of ten targets.
SDSS J102347.68+003841.2 (2009-04-16)
Anne Archibald (McGill University) and collaborators request long-term monitoring of the transient source SDSS J102347.68+003841.2 (== FIRST J102347.6+003841). This object is a known ellipsoidal variable (V ~17.3-17.8) consisting of a neutron star primary and a 0.2 solar mass secondary, with a binary period of 0.198 days. While the known ellipsoidal variation is understood to be a combination of tidal
deformation of the secondary and heating of the side closer to the primary, the system was also observed to go into optical outburst in
2001, increasing in optical flux by a factor of 4 (~1.5 magnitudes), suggesting that a mass transfer episode occurred. The neutron star is a
known pulsar, and the system is described as a "radio-selected cataclysmic variable"; the intermittent accretion may indicate that this
is a very evolved low-mass X-ray binary. Currently (as of 2009 April) the system does not appear to be active, and no sign of an accretion
disk is seen. Long-term monitoring of this faint star for future outbursts of a similar nature is requested. Future outbursts will trigger X-ray and radio observations of this source to better understand the evolution of neutron star binary systems.
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