Spectroscopic and Spectropolarimetric Observations of V838 Monocerotis

  title={Spectroscopic and Spectropolarimetric Observations of V838 Monocerotis},
  author={John P. Wisniewski and Nancy Dunlap Morrison and Karen S. Bjorkman and Anatoly Miroshnichenko and Amanda C. Gault and Jennifer L. Hoffman and Marilyn R. Meade and Jason Michael Nett},
  journal={The Astrophysical Journal},
  pages={486 - 493}
The spectroscopic and spectropolarimetric variability of the peculiar variable V838 Monocerotis during the brighter phases of its multiple outbursts in 2002 is presented. Significant line profile variability of Hα and Si II 6347.10 and 6371.36 Å occurred in spectra obtained between 2002 February 5 and March 14, and a unique secondary absorption component was observed near the end of this time period. Our observations also suggest that multiple shifts in ionization states occurred during the… 
Polarimetric evolution of V838 Monocerotis
We present the results of our polarimetric and spectropolarimetric monitoring of V838 Monocerotis, performed at the Asiago and Crimean observatories during and after the multiple outbursts that
Spectral evolution of V838 Monocerotis in the optical and near-infrared in early 2002
We report optical and near-infrared spectroscopy, and optical spectropolarimetry, of the peculiar variable V838 Mon during the multiple outburst phase in early 2002. The spectral evolution is
VLT spectropolarimetry of the optical transient in NGC 300 - Evidence of asymmetry in the circumstellar dust
Aims. We study possible signs of asymmetry in the bright optical transient in NGC 300, to obtain independent information about the explosion mechanism, the progenitor star and its circumstellar
The eruptive variable V838 Monocerotis (V838 Mon) gained notoriety in 2002 when it brightened nine magnitudes in a series of three outbursts and then rapidly evolved into an extremely cool
Comparative spectral analysis of the peculiar red novae V838 Mon and V4332 Sgr in quiescence after their outbursts
We analyze spectra of V838 Mon and V4332 Sgr taken in 2004–2005 using the 6 m telescope of the Special Astrophysical Observatory with the UAGS and SCORPIO spectrographs; the spectra have a resolution
V838 Monocerotis: the central star and its environment a decade after outburst
Aims. V838 Monocerotis erupted in 2002, brightened in a series of outbursts, and eventually developed a spectacular light echo. A very red star emerged a few months after the outburst. The whole
Evolution of the Inner Circumstellar Envelope of V838 Monocerotis
We present imaging polarimetry observations of the eruptive variable V838 Monocerotis and its neighboring field obtained in 2002 October. The polarization of field stars confirms the previously
Low- and Medium-Dispersion Spectropolarimetry of Nova V475 Scuti (Nova Scuti 2003): Discovery of an Asymmetric High-Velocity Wind in a Moderately Fast Nova
We present low-resolution (R ∼ 90) and medium-resolution (R ∼ 2500) spectropolarimetry of nova V475 Sct taken with the HBS instrument, mounted on the 0.91 m telescope at the Okayama Astrophysical
Infall and SiO emission in V838 Mon
ABSTRACT We present moderate and high resolution infrared spectroscopyof the peculiar eruptivevariable V838 Mon, which underwent a series of remarkable outbursts in early 2002.During the period
Evolution of V838 Monocerotis during and after the 2002 eruption
By fitting the available photometric data on V838 Mon with standard supergiant spectra we have derived principal stellar parameters, i.e. effective temperature, radius and luminosity, and followed


Near infra-red spectroscopy of V838 Monocerotis
Near - IR, multi - epoch, spectroscopic and photometric observations of the enigmatic, eruptive variable V838 Mon in the JHK bands are reported. One of the unusual features of the spectra is the
Nova Monocerotis 2002 (V838 Mon) at early outburst stages
AbstractWe obtained U BV R photometric and spectroscopic observations during the outburst of V838 Mon. Before its outburst, the B brightness of the star had been stable ( $$\tilde15.^m 85$$ ) for 45
Constraints on the Geometry of Circumstellar Envelopes: Optical Interferometric and Spectropolarimetric Observations of Seven Be Stars
We have obtained contemporaneous optical interferometry and spectropolarimetry of seven Be stars. The interferometry was done using both continuum and narrow Hα line filters to observe the
The peculiar variable V838 Mon
V838 Mon underwent, after a first nova-like outburst in January and a usual decline, a second outburst after one month, and a third weak one again a month later. Moreover, a very small increase of
Using high-quality spectra obtained with the hydrogren fluoride technique at the Canada-France-Hawaii 3.6-meter telescope and Dominion Astrophysical Observatory 1.22-meter telescope, we have detected
Spectropolarimetry of Nova Cygni 1992: Evidence for an asymmetric geometry
We present the first study of the spectropolarimetric evolution of a fast neon nova from outburst through the decline of the light curve, showing the initial presence and gradual disappearance of
On 23 and 27 March 1996, we obtained high-resolution (R ≃ 26,000) échelle spectra by manually guiding on the head of Comet C/1996 B2 (Hyakutake). The two spectra cover different but slightly
The mysterious eruption of V838 Mon
V838 Mon is marking one of the most mysterious stellar outbursts on record. The spectral energy distribution of the progenitor resembles an under-luminous F main sequence star (at V =1 5:6 mag), that
Deriving the Geometry of Be Star Circumstellar Envelopes from Continuum Spectropolarimetry. I. The Case of ζ Tauri
We present a general scheme for determining the circumstellar geometry of Be stars from modeling of optical continuum spectropolarimetry. Our modeling scheme utilizes a Monte Carlo radiation transfer
A multi-epoch spectrophotometric atlas of symbiotic stars
A multi-epoch, absolute-fluxed spectral atlas extending from about 3200 to 9000 A is presented for 130 symbiotic stars, including members of the LMC, SMC and Draco dwarf galaxies. The fluxes are