263 research outputs found
Symbiotic Stars as Laboratories for the Study of Accretion and Jets: A Call for Optical Monitoring
Symbiotic binary stars typically consist of a white dwarf (WD) that accretes
material from the wind of a companion red giant. Orbital periods for these
binaries are on the order of years, and their relatively small optical
outbursts tend to occur every few years to decades. In some symbiotics,
material that is transferred from the red giant to the WD forms a disk around
the WD. Thus, symbiotic stars are a bit like overgrown cataclysmic variables
(CVs), but with less violent eruptions. Symbiotic stars are not as well
understood as CVs, in part because their longer variability time scales mean
that observations over many years are required to cover different outburst
states and orbital phases. The recent discovery of collimated outflows ("jets")
from a number of symbiotics, provides a new motivation for such long-term study
of these objects. Astrophysical jets are observed in almost every type of
accretion-powered system, and symbiotic stars may help us understand these
structures. In symbiotics, most jets appear to be associated with optical
eruptions. Optical monitoring by amateurs can identify systems in outburst, and
also help to build a comprehensive database of outburst and quiescent symbiotic
light curves. Together with radio through X-ray observations that will be
performed when new outbursts are found, long-term optical light curves will
improve understanding of symbiotic outbursts, jet production, and the
connection between outbursts, jets, and accretion disks in symbiotic stars.Comment: 14 pages, 3 figures. Invited review paper to appear in the Journal of
the American Association of Variable Star Observers (AAVSO
A study of the mass loss rates of symbiotic star systems
The amount of mass loss in symbiotic systems is investigated, specifically
mass loss via the formation of jets in R Aquarii (R Aqr). The jets in R Aqr
have been observed in the X-ray by Chandra over a four year time period. The
jet changes on times scales of a year and new outflows have been observed.
Understanding the amount of mass and the frequency of ejection further
constrain the ability of the white dwarf in the system to accrete enough mass
to become a Type 1a supernova progenitor. The details of multi-wavelength
studies, such as speed, density and spatial extent of the jets will be
discussed in order to understand the mass balance in the binary system. We
examine other symbiotic systems to determine trends in mass loss in this class
of objects.Comment: To be published in the proceedings of "The Multicoloured Landscape of
Compact Objects and their Explosive Origins
A NuSTAR observation of the fast symbiotic nova V745 Sco in outburst
The fast recurrent nova V745 Sco was observed in the 3-79 keV X-rays band
with NuSTAR 10 days after the optical discovery. The measured X-ray emission is
consistent with a collisionally ionized optically thin plasma at temperature of
about 2.7 keV. A prominent iron line observed at 6.7 keV does not require
enhanced iron in the ejecta. We attribute the X-ray flux to shocked
circumstellar material. No X-ray emission was observed at energies above 20
keV, and the flux in the 3-20 keV range was about 1.6 10 erg
cm s. The emission measure indicates an average electron density
of order of 10 cm.
The X-ray flux in the 0.3-10 keV band almost simultaneously measured with
Swift was about 40 times larger, mainly due to the luminous central supersoft
source emitting at energy below 1 keV. The fact that the NuSTAR spectrum cannot
be fitted with a power law, and the lack of hard X-ray emission, allow us to
rule out Comptonized gamma rays, and to place an upper limit of the order of
10 erg cm s on the gamma-ray flux of the nova on the
tenth day of the outburst.Comment: in press in Monthly Notices of the Royal Astronomical Society, 201
Swift observations of the 2015 outburst of AG Peg -- from slow nova to classical symbiotic outburst
Symbiotic stars often contain white dwarfs with quasi-steady shell burning on
their surfaces. However, in most symbiotics, the origin of this burning is
unclear. In symbiotic slow novae, however, it is linked to a past thermonuclear
runaway. In June 2015, the symbiotic slow nova AG Peg was seen in only its
second optical outburst since 1850. This recent outburst was of much shorter
duration and lower amplitude than the earlier eruption, and it contained
multiple peaks -- like outbursts in classical symbiotic stars such as Z And. We
report Swift X-ray and UV observations of AG Peg made between June 2015 and
January 2016. The X-ray flux was markedly variable on a time scale of days,
particularly during four days near optical maximum, when the X-rays became
bright and soft. This strong X-ray variability continued for another month,
after which the X-rays hardened as the optical flux declined. The UV flux was
high throughout the outburst, consistent with quasi-steady shell burning on the
white dwarf. Given that accretion disks around white dwarfs with shell burning
do not generally produce detectable X-rays (due to Compton-cooling of the
boundary layer), the X-rays probably originated via shocks in the ejecta. As
the X-ray photo-electric absorption did not vary significantly, the X-ray
variability may directly link to the properties of the shocked material. AG
Peg's transition from a slow symbiotic nova (which drove the 1850 outburst) to
a classical symbiotic star suggests that shell burning in at least some
symbiotic stars is residual burning from prior novae.Comment: Accepted by MNRAS 23 June 2016. Manuscript submitted in original form
5 April 201
Symbiotic stars in X-rays III: Suzaku observations
We describe the X-ray emission as observed with Suzaku from five symbiotic
stars that we selected for deep Suzaku observations after their initial
detection with ROSAT, ASCA and Swift. We find that the X-ray spectra of all
five sources can be adequately fit with absorbed, optically thin thermal plasma
models, with either single- or multi-temperature plasmas. These models are
compatible with the X-ray emission originating in the boundary layer between an
accretion disk and a white dwarf. The high plasma temperatures of kT keV
for all five targets were greater than expected for colliding winds. Based on
these high temperatures, as well as previous measurements of UV variability and
UV luminosity, and the large amplitude of X-ray flickering in 4 Dra, we
conclude that all five sources are accretion-powered through predominantly
optically thick boundary layers. Our X-ray data allow us to observe a small,
optically thin portion of the emission from these boundary layers. Given the
time between previous observations and these observations, we find that the
intrinsic X-ray flux and the intervening absorbing column can vary by factors
of three or more on a time scale of years. However, the location of the
absorber and the relationship between changes in accretion rate and absorption
are still elusive.Comment: 14 pages, 3 figures and 3 tables. Accepted to published 04/15/2016.
arXiv admin note: substantial text overlap with arXiv:1505.0063
- …