[Show abstract][Hide abstract] ABSTRACT: ANS Collaboration is a growing Italian network of small and medium size
telescopes performing spectroscopy (low and medium resolution single
dispersion, and Echelle high resolution modes) and UBVRC
IC CCD photometry of symbiotic stars and novae mainly, but
with interest also on other types of objects like optical transients,
eclipsing binaries, X-ray source counterparts and on-call follow-up
observations of selected targets from some surveys like IPHAS or RAVE.
In the present form ANS started operations in 2005, and at the time of
writing has logged on symbiotic stars 14602 photometric runs and a rich
ensemble of low and high resolution, absolutely fluxed spectra. The
paper describes the internal organization, operation modes and
procedures, and presents sample data and performance statistics.
[Show abstract][Hide abstract] ABSTRACT: AX Per is an eclipsing symbiotic binary. During active phases, deep narrow
minima are observed in its light curve, and the ionization structure in the
binary changes significantly. From 2007.5, AX Per entered a new active phase.
It was connected with a significant enhancement of the hot star wind.
Simultaneously, we identified a variable optically thick warm (Teff ~ 6000 K)
source that contributes markedly to the composite spectrum. The source was
located at the hot star's equator and has the form of a flared disk, whose
outer rim simulates the warm photosphere. The formation of the neutral
disk-like zone around the accretor during the active phase was connected with
its enhanced wind. We suggested that this connection represents a common origin
of the warm pseudophotospheres that are indicated during the active phases of
Full-text · Article · Oct 2011 · Astronomy and Astrophysics
[Show abstract][Hide abstract] ABSTRACT: The tables contain photometric B, V, Rc, Ic CCD observations as well as
photoelectric U, B, V observations of symbiotic binary AX Persei. The
dereddened emission line fluxes for several lines are also given.
(3 data files).