Multiwavelength observations of NaSt1 (WR 122): equatorial mass loss and X-rays from an interacting Wolf–Rayet binary

  title={Multiwavelength observations of NaSt1 (WR 122): equatorial mass loss and X-rays from an interacting Wolf–Rayet binary},
  author={Jon C. Mauerhan and Nathan Smith and Schuyler D. Van Dyk and Katie M. Morzinski and Laird M. Close and Philip M. Hinz and Jared R. Males and Timothy J. Rodigas},
  journal={Monthly Notices of the Royal Astronomical Society},
NaSt1 (aka Wolf–Rayet 122) is a peculiar emission-line star embedded in an extended nebula of [N ii] emission with a compact dusty core. The object was previously characterized as a Wolf–Rayet (WR) star cloaked in an opaque nebula of CNO-processed material, perhaps analogous to η Car and its Homunculus nebula, albeit with a hotter central source. To discern the morphology of the [N ii] nebula we performed narrow-band imaging using the Hubble Space Telescope and Wide-field Camera 3. The images… 

Figures and Tables from this paper

Stagnant Shells in the Vicinity of the Dusty Wolf–Rayet–OB Binary WR 112

We present high spatial resolution mid-infrared images of the nebula around the late-type carbon-rich Wolf–Rayet (WC)–OB binary system WR 112 taken by the recently upgraded VLT spectrometer and

Massive stars exploding in a He-rich circumstellar medium – IX. SN 2014av, and characterization of Type Ibn SNe

We present spectroscopic and photometric data of the Type Ibn supernova (SN) 2014av, discovered by the Xingming Observatory Sky Survey. Stringent pre-discovery detection limits indicate that the


We present a systematic study of mid-infrared emission from 141 nearby supernovae (SNe) observed with Spitzer/IRAC as part of the ongoing SPIRITS survey. We detect 8 Type Ia and 36 core-collapse SNe.

Discovery of a 310 Day Period from the Enshrouded Massive System NaSt1 (WR 122)

We present optical and infrared (IR) light curves of NaSt1, also known as Wolf–Rayet 122, with observations from Palomar Gattini-IR (PGIR), the Zwicky Transient Facility (ZTF), the Katzman Automatic

High-resolution spectroscopy of SN 2017hcc and its blueshifted line profiles from post-shock dust formation

SN2017hcc was remarkable for being a nearby and strongly polarized superluminous TypeIIn supernova (SN). We obtained high-resolution echelle spectra that we combine with other spectra to investigate

Revisiting the Impact of Dust Production from Carbon-rich Wolf–Rayet Binaries

We present a dust spectral energy distribution (SED) and binary stellar population analysis revisiting the dust production rates (DPRs) in the winds of carbon-rich Wolf–Rayet (WC) binaries and their

MagAO: status and science

”MagAO" is the adaptive optics instrument at the Magellan Clay telescope at Las Campanas Observatory, Chile. MagAO has a 585-actuator adaptive secondary mirror and 1000-Hz pyramid wavefront sensor,

The Arches cluster revisited

Context. Located within the central region of the Galaxy, the Arches cluster appears to be one of the youngest, densest, and most massive stellar aggregates within the Milky Way. As such, it has the

Searching for Anomalies in the ZTF Catalog of Periodic Variable Stars

Periodic variables illuminate the physical processes of stars throughout their lifetime. Wide-field surveys continue to increase our discovery rates of periodic variable stars. Automated approaches

Anisotropic winds in a Wolf–Rayet binary identify a potential gamma-ray burst progenitor

The massive evolved Wolf–Rayet stars sometimes occur in colliding-wind binary systems in which dust plumes are formed as a result of the collision of stellar winds1. These structures are known to



Episodic mass loss in binary evolution to the Wolf–Rayet phase: Keck and HST proper motions of RY Scuti’s nebula★

Binary mass transfer via -Roche lobe overflow (RLOF) is a key channel for producing stripped-envelope Wolf–Rayet (WR) stars and may be critical to account for Type Ib/c supernova progenitors. RY

SN 2006jc: A Wolf-Rayet Star Exploding in a Dense He-rich Circumstellar Medium

We present optical photometry and spectra of the peculiar Type Ib supernova (SN) 2006jc. Strong and relatively narrow He I emission lines indicate the progenitor star exploded inside a dense

Pinwheel Nebula around WR 98a

Interpreting the collimated dust outflow in terms of an interacting winds model, the binary orbital parameters and apparent wind speed are derived, consistent with a possible approximately 588 day periodicity in the infrared light curve, linking the photometric variation to the binary orbit.

XMM–Newton X-ray observations of the Wolf–Rayet binary system WR 147

We present results of an ≈20-ks X-ray observation of the Wolf-Rayet (WR) binary system WR 147 obtained with XMM-Newton. Previous studies have shown that this system consists of a nitrogen-type WN8

The WR+OB Progenitor RY Scuti: Intensive Spectroscopy of Its Compact Double-Ring Nebula

We present a detailed spectroscopic analysis of the peculiar nebula around RY Scuti using data from the Space Telescope Imaging Spectrograph (STIS) and various ground-based observatories. This

Puzzling X-rays from the new colliding wind binary Wolf–Rayet 65 (WC9d)

We report the discovery of variability in the X-ray emission from the Wolf–Rayet type star WR 65. Using archival Chandra data spanning over 5 yr, we detect changes of the X-ray flux by a factor of 3

Proper Motions of New Dust in the Colliding Wind Binary WR 140

The eccentric W-R + O binary system WR 140 produces dust for a few months at intervals of 7.94 yr coincident with periastron passage. We present the first resolved images of this dust shell, at


We present new identifications of infrared counterparts to the population of hard X-ray sources near the Galactic center detected by the Chandra X-ray Observatory. We have spectroscopically confirmed

A dusty pinwheel nebula around the massive star WR104

Wolf-Rayet (WR) stars are luminous, massive blue stars thought to be the immediate precursors to some supernovae. The existence of dust shells around such stars has been enigmatic since their


We summarize new X-ray detections of four nitrogen-type Wolf–Rayet (WR) stars obtained in a limited survey aimed at establishing the X-ray properties of WN stars across their full range of spectral