Zobrazeno 1 - 10
of 89
pro vyhledávání: '"Schmidtke, P. C."'
We have analyzed OGLE-III photometry for stars in the SMC cluster NGC 299. Two eclipsing binaries and one intrinsic variable (most likely a Be star) are identified. Unlike other young SMC clusters, no low-amplitude pulsating variables are present.
Externí odkaz:
http://arxiv.org/abs/1302.6943
Publikováno v:
Astron.J.132:971-975,2006
We have studied five seasons of OGLE-III data for eight SMC Be/X-ray pulsars for which no other survey data were available. We have determined orbital periods for four of these binary systems, one of which also shows nonradial pulsations. Optical ide
Externí odkaz:
http://arxiv.org/abs/astro-ph/0605397
Autor:
Schmidtke, P. C., Cowley, A. P.
We have studied the photometric variability of ten SMC Be/X-ray pulsars using MACHO and OGLE-II data. For some of these systems we have found periodic behavior, including orbital outbursts and/or nonradial pulsations (NRP) of the Be star. For others
Externí odkaz:
http://arxiv.org/abs/astro-ph/0605395
Autor:
Schmidtke, P. C., Cowley, A. P.
Publikováno v:
Astron.J.131:600-602,2006
X-ray data reveal that the supersoft X-ray binary CAL 83 exhibits 38.4 minute pulsations at some epochs. These X-ray variations are similar to those found in some novae and are likely to be caused by nonradial pulsations the white dwarf. This is the
Externí odkaz:
http://arxiv.org/abs/astro-ph/0507145
Autor:
Schmidtke, P. C., Cowley, A. P.
Publikováno v:
Astron.J.130:2220-2229,2005; Astron.J.132:919-925,2006
Analysis of the longterm photometric variability of 7 Be/X-ray-pulsar systems in the Small Magellanic Cloud has been carried out. We find a variety of types of variability are present, including: longterm irregular changes, periodic orbital outbursts
Externí odkaz:
http://arxiv.org/abs/astro-ph/0506728
FUSE observations were obtained in July 2003 during 1.2 cycles of the 0.76-day binary orbit of RX J0513.9-6951. Radial velocity measurements of the broad O VI emission profile show a semiamplitude of K~26 km/sec, which is much smaller than the value
Externí odkaz:
http://arxiv.org/abs/astro-ph/0503417
A new ephemeris has been determined for the supersoft X-ray binary CAL 83 using MACHO photometry. With an improved orbital period of 1.047568 days, it is now possible to phase together photometric and spectroscopic data obtained over the past two dec
Externí odkaz:
http://arxiv.org/abs/astro-ph/0311395
Autor:
Cowley, A. P., Schmidtke, P. C.
The optical light curve of the Be/neutron star binary AX J0049.4-7323 has been investigated using data from the MACHO and OGLE-II projects. This X-ray source, whose neutron star has a very slow rotation rate (P_pulse=755.5 sec), shows optical outburs
Externí odkaz:
http://arxiv.org/abs/astro-ph/0311393
Publikováno v:
Astron.J. 124 (2002) 2233-2237
We have analyzed nearly eight years of MACHO optical photometry of the supersoft X-ray binary RX J0513.9-6951 and derived a revised orbital period and ephemeris. Previously published velocities are reinterpreted using the new ephemeris. We show that
Externí odkaz:
http://arxiv.org/abs/astro-ph/0207643
We have obtained spectroscopy with the Far Ultraviolet Spectroscopic Explorer (FUSE) of the supersoft X-ray binary RX J0513.9-6951 over a complete binary orbital cycle. The spectra show a hot continuum with extremely broad O VI emission and weak Lyma
Externí odkaz:
http://arxiv.org/abs/astro-ph/0207651