Nova Monocerotis 2002 (V838 Mon) at Early Outburst Stagesстатья

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[1] Nova monocerotis 2002 (v838 mon) at early outburst stages / V. P. Goranskii, A. V. Kusakin, N. V. Metlova et al. // SOVIET ASTRONOMY LETTERS. — 2002. — Vol. 28, no. 10. — P. 691–700. We 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 ( 1˜5.m85 ) for 45 years. This was a blue star with the color index (B−V)_0 = −0.m03±0.m1 and may have been a cataclysmic variable. In the middle of March 2002, the outburst amplitude reached 8.m1 in B. The star has the counterpart V 1006/7 in M 31 in luminosity at maximum and in spectrum. The unusual spectrum at the premaximum stage originated in the expanding photosphere of a cool K-type giant. The expansion velocity of the photosphere was 150 km s−1; the maximum velocity in the expanding stellar envelope reached 500 km s−1. The absorption components of neutral metal lines were enhanced by a factor of 3 or 4 compared to a normal K-type star. No overabundance of s-process elements was found. One day before the brightness peak, an intense Hα emission line with broad wings, FWZI=3100 km s−1, and numerous lines of ionized metals appeared in V838 Mon, which is characteristic of normal classical novae. We show light, color, and spectral variations of the object. [ DOI ]

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