Near infra-red spectroscopy of V838 Monocerotis

Abstract

Near IR, multi-epoch, spectroscopic and photometric observations of the enigmatic, eruptive variable V838 Mon in JHK bands are reported. One of the unusual features is the detection of several strong neutral TiI lines in emission in the K band. From the strength of these lines, the mass of the ejected envelope is estimated to be in the range 10e-7 to 10e-5 M(sun). The spectra also show the strong presence of the first and second overtones of 12CO bands seen in the K and H bands. The CO bands show a complex evolution. Deep water bands at 1.4 and 1.9 micron are also seen later in the object's evolution. Blackbody fits to the JHK photometric data show that V838 Mon has evolved to temperatures between 2400 - 2600 K by approximately 130 days after outburst. The spectra at this stage have the general characteristics of a very cool M giant.

arXiv comment7 pages, 5 figures, to appear in Astronomy and Astrophysics

References in corpus (6)

• The mysterious eruption of V838 Mon
• Near-Infrared Classification Spectroscopy: H-band Spectra of Fundamental MK Standards
• Nova Sagittarii 1994 #1 (V4332 Sagittarii): The Discovery and Evolution of an Unusual Luminous Red Variable Star
• Near-Infrared Classification Spectroscopy: J-Band Spectra of Fundamental MK Standards
• Moderate resolution near-infrared spectroscopy of cool stars: a new K-band library
• The rise and fall of V4334 Sgr (Sakurai's Object)

Cited by in corpus (38)

• Main-sequence stellar eruption model for V838 Mon
• A model of an expanding giant that swallowed planets for the eruption of V838 Monocerotis
• The post-outburst photometric behaviour of V838 Mon
• The enigmatic outburst of V445 Puppis - a possible Helium nova?
• Remarkable changes in the near-infrared spectrum of the nova-like variable V4332 Sgr
• On the distance, reddening and progenitor of V838 Mon
• Near-Infrared Studies of V1280 Sco (Nova Scorpii 2007)
• Spectroscopic and Spectropolarimetric Observations of V838 Mon
• V838 Monocerotis: the central star and its environment a decade after outburst
• The Temporal Development of Dust Formation and Destruction in Nova Sagittarii 2015#2 (V5668 Sgr): A Panchromatic Study
• On the CO Near-IR Band and the Line Splitting Phenomenon in the Yellow Hypergiant Rho Cassiopeiae
• An Extended Grid of Nova Models. III. Very Luminous, Red Novae
• Hubble Space Telescope Imaging of the Outburst Site of M31 RV
• An interferometric study of the post-AGB binary 89 Herculis I Spatially resolving the continuum circumstellar environment at optical and near-IR wavelengths with the VLTI, NPOI, IOTA, PTI, and the CHARA Array
• Near-Infrared water lines in V838 Monocerotis
• Optical studies of V4332 Sagittarii - detection of unusually strong KI and NaI lines in emission
• Interferometric Observations of V838 Monocerotis
• Spitzer Observations of V838 Monocerotis: Detection of a Rare Infrared Light Echo
• Polarimetric evolution of V838 Mon
• Evolution of the Inner Circumstellar Envelope of V838 Monocerotis
• A search for radioactive 26Al in the nova-like variable V4332 Sagittarii
• Infrared spectroscopy of carbon monoxide in V838 Mon during 2002--2006
• Evolution of the dust in V4332 Sagittarii
• Dusty, Self-obscured Transients from Stellar Coalescence
• Nova KT Eri 2009: Infrared studies of a very fast and small amplitude He/N nova
• Infall and SiO emission in V838 Mon
• The hybrid, coronal lines nova V5588 Sgr (2011 N.2) and its six repeating secondary maxima
• Infrared studies of the Be star X Per
• The mid-infrared environment of the stellar merger remnant V838 Monocerotis
• Near-infrared and optical studies of the highly obscured nova V1831 Aquilae (Nova Aquilae 2015)
• Near-infrared studies of V5558 Sgr: an unusually slow nova with multiple outbursts
• The absorption spectrum of V838 Mon in 2002 February - March. I. Atmospheric parameters and iron abundance
• Reconstructing the mid-infrared environment in the stellar merger remnant V838 Monocerotis
• Studies of the Be star X Persei during a bright infrared phase
• The luminous red nova AT 2018bwo in NGC 45 and its binary yellow supergiant progenitor
• The properties of V838 Mon in 2002 November
• Studies of a possible new Herbig Ae/Be star in the open cluster NGC 7380
• The Infrared Evolution of Dust in V838 Monocerotis