V4332 Sgr in 'Quiescence'

Abstract

In 1994 V4332 Sgr underwent a mysterious eruption. Somehow its fast evolution towards a red giant star was, lacking alternative classifications, connected to the red variable M31 RV, which had its eruption in 1988. The red eruptive variable V838~Mon draw in February 2002 the attention back to its 'older twin' V4332~Sgr. The new precise photometry of the progenitor given here shows that the object started to rise years before the 1994 event. Post outburst photometry and spectroscopy from 2002 and 2003 show that the object stopped it's decline and seem to reheat now. The progenitor data and the new high quality spectra provide a supplement and completion to the data around the outburst given by Martini et al. (1999). It thus allows theorists to give new boundaries for modelling of this unusual object.

arXiv comment7 pages, 8 figures, submitted to AN

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• The Distances of the Galactic Novae
• Spitzer observations of V4332 Sagittarii: Detection of Alumina Dust
• Panchromatic evolution of three luminous red novae: Forbidden hugs in pandemic times -- IV
• Optical spectropolarimetry of V4332 Sagittarii
• Strong linear polarization of V4332 Sgr: a dusty disc geometry
• Lithium in coalesced non-compact stars
• XMM-Newton detection of a transient X-ray source in the vicinity of V838 Monocerotis
• Refined Telluric Absorption Correction for Low-Resolution Ground-Based Spectroscopy: Resolution and Radial Velocity Effects in the O2 A-Band for Exoplanets and K I Emission Lines