A. Aungwerojwit - Academia.edu (original) (raw)
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Papers by A. Aungwerojwit
Astronomy and Astrophysics, Dec 1, 2011
Astrophysics and Space Science Library, 2003
ABSTRACT
These files present the observational data of the paper. There are 7 files : 6 for photometry (BV... more These files present the observational data of the paper. There are 7 files : 6 for photometry (BVRIri) and one for polarimetry. Details of the reduction procedures and the telescopes involved can be found in the paper. (7 data files).
Monthly Notices of the Royal Astronomical Society, 2009
The Astrophysical Journal, 2012
ABSTRACT We present time-resolved photometry of a cataclysmic variable discovered in the Isaac Ne... more ABSTRACT We present time-resolved photometry of a cataclysmic variable discovered in the Isaac Newton Telescope Photometric Halpha Survey of the northern galactic plane, IPHAS J062746.41+014811.3 and classify the system as the fourth deeply eclipsing intermediate polar known with an orbital period of Porb=8.16 h, and spin period of Pspin=2210 s. The system shows mild variations of its brightness, that appear to be accompanied by a change in the amplitude of the spin modulation at optical wavelengths, and a change in the morphology of the eclipse profile. The inferred magnetic moment of the white dwarf is mu_wd = 6-7 x 10^33 Gcm^3, and in this case IPHAS J0627 will either evolve into a short-period EX Hya-like intermediate polar with a large Pspin\Porb ratio, or, perhaps more likely, into a synchronised polar. Swift observations show that the system is an ultraviolet and X-ray source, with a hard X-ray spectrum that is consistent with those seen in other intermediate polars. The ultraviolet light curve shows orbital modulation and an eclipse, while the low signal-to-noise ratio X-ray light curve does not show a significant modulation on the spin period. The measured X-ray flux is about an order of magnitude lower than would be expected from scaling by the optical fluxes of well-known X-ray selected intermediate polars.
The Astrophysical Journal, 2007
The Astrophysical Journal, 2010
The Astronomical Journal, 2013
Publications of the Astronomical Society of the Pacific, 2012
We report two new accreting ZZ Ceti stars amongst the cataclysmic variables of the Sloan Digital ... more We report two new accreting ZZ Ceti stars amongst the cataclysmic variables of the Sloan Digital Sky Survey: SDSS J074531.92+453829.5 and SDSS J091945.11+085710.0. We observe high amplitude non-sinusoidal variations of 4.5--7% at a period close to 1230 s in the optical light curves of SDSS J074531.92+453829.5 and a low amplitude variation of 0.7--1% near 260 s in the light curves of SDSS J091945.11+085710.0. We infer that these optical variations are a consequence of non-radial g-mode pulsations in the accreting primary white dwarfs of these cataclysmic variables. This discovery paper brings the total number of known accreting white dwarf pulsators to ten. We determine an orbital period of 86.3 ± 2.0 min for SDSS J074531.92+453829.5 and 93.5 ± 8.5 min for SDSS J091945.11+085710.0.
Monthly Notices of the Royal Astronomical Society, 2009
Monthly Notices of the Royal Astronomical Society, 2009
... Deacon, NR, Groot, PJ, Drew, JE, Greimel, R., Hambly, NC, Irwin, MJ, Aungwerojwit, A., Drake,... more ... Deacon, NR, Groot, PJ, Drew, JE, Greimel, R., Hambly, NC, Irwin, MJ, Aungwerojwit, A., Drake, J. and Steeghs, D. (2009), The IPHAS-POSS-I proper motion survey ... Isaac Newton Group of Telescopes, Apartado de correos 321, E38700 Santa Cruz de La Palma, Tenerife, Spain. 4 ...
Monthly Notices of the Royal Astronomical Society, 2007
Monthly Notices of the Royal Astronomical Society, 2008
Monthly Notices of the Royal Astronomical Society, 2006
Monthly Notices of the Royal Astronomical Society, 2006
Monthly Notices of the Royal Astronomical Society, 2009
Monthly Notices of the Royal Astronomical Society, 2005
Monthly Notices of the Royal Astronomical Society, 2007
Journal of Physics: Conference Series, 2009
We identify SDSS 0110+1326, SDSS 0303+0054 and SDSS 1435+3733 as three eclipsing white dwarf plus... more We identify SDSS 0110+1326, SDSS 0303+0054 and SDSS 1435+3733 as three eclipsing white dwarf plus main sequence binaries from the Sloan Digital Sky Survey, and report on their follow-up observations. Orbital periods for the three systems are established through multi-season photometry. Time-resolved spectroscopic observations lead to the determination of the radial velocities of the secondary stars. A decomposition technique of
Astronomy and Astrophysics, Dec 1, 2011
Astrophysics and Space Science Library, 2003
ABSTRACT
These files present the observational data of the paper. There are 7 files : 6 for photometry (BV... more These files present the observational data of the paper. There are 7 files : 6 for photometry (BVRIri) and one for polarimetry. Details of the reduction procedures and the telescopes involved can be found in the paper. (7 data files).
Monthly Notices of the Royal Astronomical Society, 2009
The Astrophysical Journal, 2012
ABSTRACT We present time-resolved photometry of a cataclysmic variable discovered in the Isaac Ne... more ABSTRACT We present time-resolved photometry of a cataclysmic variable discovered in the Isaac Newton Telescope Photometric Halpha Survey of the northern galactic plane, IPHAS J062746.41+014811.3 and classify the system as the fourth deeply eclipsing intermediate polar known with an orbital period of Porb=8.16 h, and spin period of Pspin=2210 s. The system shows mild variations of its brightness, that appear to be accompanied by a change in the amplitude of the spin modulation at optical wavelengths, and a change in the morphology of the eclipse profile. The inferred magnetic moment of the white dwarf is mu_wd = 6-7 x 10^33 Gcm^3, and in this case IPHAS J0627 will either evolve into a short-period EX Hya-like intermediate polar with a large Pspin\Porb ratio, or, perhaps more likely, into a synchronised polar. Swift observations show that the system is an ultraviolet and X-ray source, with a hard X-ray spectrum that is consistent with those seen in other intermediate polars. The ultraviolet light curve shows orbital modulation and an eclipse, while the low signal-to-noise ratio X-ray light curve does not show a significant modulation on the spin period. The measured X-ray flux is about an order of magnitude lower than would be expected from scaling by the optical fluxes of well-known X-ray selected intermediate polars.
The Astrophysical Journal, 2007
The Astrophysical Journal, 2010
The Astronomical Journal, 2013
Publications of the Astronomical Society of the Pacific, 2012
We report two new accreting ZZ Ceti stars amongst the cataclysmic variables of the Sloan Digital ... more We report two new accreting ZZ Ceti stars amongst the cataclysmic variables of the Sloan Digital Sky Survey: SDSS J074531.92+453829.5 and SDSS J091945.11+085710.0. We observe high amplitude non-sinusoidal variations of 4.5--7% at a period close to 1230 s in the optical light curves of SDSS J074531.92+453829.5 and a low amplitude variation of 0.7--1% near 260 s in the light curves of SDSS J091945.11+085710.0. We infer that these optical variations are a consequence of non-radial g-mode pulsations in the accreting primary white dwarfs of these cataclysmic variables. This discovery paper brings the total number of known accreting white dwarf pulsators to ten. We determine an orbital period of 86.3 ± 2.0 min for SDSS J074531.92+453829.5 and 93.5 ± 8.5 min for SDSS J091945.11+085710.0.
Monthly Notices of the Royal Astronomical Society, 2009
Monthly Notices of the Royal Astronomical Society, 2009
... Deacon, NR, Groot, PJ, Drew, JE, Greimel, R., Hambly, NC, Irwin, MJ, Aungwerojwit, A., Drake,... more ... Deacon, NR, Groot, PJ, Drew, JE, Greimel, R., Hambly, NC, Irwin, MJ, Aungwerojwit, A., Drake, J. and Steeghs, D. (2009), The IPHAS-POSS-I proper motion survey ... Isaac Newton Group of Telescopes, Apartado de correos 321, E38700 Santa Cruz de La Palma, Tenerife, Spain. 4 ...
Monthly Notices of the Royal Astronomical Society, 2007
Monthly Notices of the Royal Astronomical Society, 2008
Monthly Notices of the Royal Astronomical Society, 2006
Monthly Notices of the Royal Astronomical Society, 2006
Monthly Notices of the Royal Astronomical Society, 2009
Monthly Notices of the Royal Astronomical Society, 2005
Monthly Notices of the Royal Astronomical Society, 2007
Journal of Physics: Conference Series, 2009
We identify SDSS 0110+1326, SDSS 0303+0054 and SDSS 1435+3733 as three eclipsing white dwarf plus... more We identify SDSS 0110+1326, SDSS 0303+0054 and SDSS 1435+3733 as three eclipsing white dwarf plus main sequence binaries from the Sloan Digital Sky Survey, and report on their follow-up observations. Orbital periods for the three systems are established through multi-season photometry. Time-resolved spectroscopic observations lead to the determination of the radial velocities of the secondary stars. A decomposition technique of