46 citations · 162 across the 14 of their papers we have counts for
14 papers
The forgotten bright star: Theta Eridani as a millenary stellar transient observed by Hipparchus, Ptolemy and al-Sufi
Idel Waisberg, Boaz Katz
Theta Eridani is a V=2.9 star that was nonetheless reported as one of the thirteen brightest stars in the night sky by both Ptolemy in his Almagest (137 AD) and by al-Sufi in his T…
Confirming Nunki as the closest core collapse progenitor candidate to the Sun
Idel Waisberg, Boaz Katz
We have recently suggested that Nunki=Sigma Sagittarii is the closest core collapse progenitor candidate to the Sun based on a VLTI/GRAVITY observation that unveiled it as a $6.5+6…
Upgrading Alpha Crucis to a seven star system. Discovery of Bb and orbital misalignment
Idel Waisberg, Boaz Katz
Alpha Crucis is the closest very high multiplicity massive star to the Sun. At its heart is the binary (A) + (B) Cru, which combined…
von Zeipel-Kozai-Lidov oscillations in nearby bright stars. I. Lambda Ophiuchi
Idel Waisberg, Ygal Klein, Boaz Katz
The challenge of constraining both the inner and the outer orbits in multiple stars has resulted in a growing abyss between the rich theoretical and the sparse observational studie…
Which is the most eccentric binary known? Insights from the 2023/4 pericenter passages of Zeta Boötis and Eta Ophiuchi
Idel Waisberg, Ygal Klein, Boaz Katz
There is a clear dearth of very eccentric binaries among those for which individual eccentricities can be measured. In this paper we report on observations of the two nearby, brigh…
An SS433 flare caught by TESS. Fast rise times and evidence for a 13 hours quasi-period
Idel Waisberg
SS433 is an exotic Galactic microquasar in which there is a supercritical inflow of matter into a compact object of likely black hole nature. Here we report on an SS433 flare that…
Binarity and beyond in A stars I. Survey description and first results of VLTI/GRAVITY observations of VAST targets with high Gaia-Hipparcos accelerations
Idel Waisberg, Ygal Klein, Boaz Katz
A-stars are the progenitors of about half of the white dwarfs (WDs) that currently exist. The connection between the multiplicity of A-stars and that of WDs is not known and the ob…
Beyond binarity in A stars II. Disentangling the four stars in the vicinity of the triple HIP 87813 within the quintuple system HJ2814
Idel Waisberg, Ygal Klein, Boaz Katz
A-stars are the progenitors of about half of the white dwarfs (WDs) that currently exist. The connection between the multiplicity of A-stars and that of WDs is not known and both m…
Spectroscopic Detection of a Cusp of Late-type Stars around the Central Black Hole in the Milky Way
M. Habibi, S. Gillessen, O. Pfuhl +12
In a dynamically relaxed cluster around a massive black hole a dense stellar cusp of old stars is expected to form. Previous observations showed a relative paucity of red giant sta…
The Collimated Radiation in SS 433. Constraints from Spatially Resolved Optical Jets and Modeling of the Optical Bullets
Idel Waisberg, Jason Dexter, Pierre Olivier-Petrucci +2
The microquasar SS 433 is well-known for its precessing, relativistic baryonic jets. Depending on their heating mechanism, the optical jet bullets may serve as a probe of the colli…
Super-Keplerian Equatorial Outflows in SS 433. Centrifugal Ejection of the Circumbinary Disk
Idel Waisberg, Jason Dexter, Pierre Olivier-Petrucci +2
The microquasar SS 433 is the only known steady supercritical accretor in the Galaxy. It is well-known for its relativistic baryonic jets, but the system also drives equatorial out…
A Detection of Sgr A* in the far infrared
Sebastiano D. von Fellenberg, Stefan Gillessen, Javier Graciá-Carpio +14
We report the first detection of the Galactic Centre massive black hole, Sgr~A*, in the far infrared. Our measurements were obtained with PACS on board the \emph{Herschel} satellit…
Optical Distortion in the NACO Imager
P. M. Plewa, S. Gillessen, M. Bauböck +11
In this research note, we present a set of distortion solutions that may be used to correct geometric optical distortion in images taken with the S13 camera of the NACO adaptive op…
Echelle Spectroscopy of gamma-ray binary 1FGL J1018.6-5856
Idel R. Waisberg, Roger W. Romani
We observed the Fermi-discovered gamma-ray binary 1FGL J1018.6-5856 at 20 epochs over 50 days using the CHIRON spectrograph, obtaining spectra at R~25,000 covering 4090-8908A. The…