Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007jena.confe..29v&link_type=abstract
"JENAM-2007, "Our non-stable Universe", held 20-25 August 2007 in Yerevan, Armenia. Abstract book, p. 29-29"
Astronomy and Astrophysics
Astronomy
Scientific paper
Using optical to mid-IR photometry and spectroscopy at the VLT, we monitored the recent outburst of V1647 Ori - the illuminating source of a new nebula dicovered in 2003 by the amateur astronomer J.W. McNeil. The optical spectrum of V1647 Ori is characterised by H-alpha and H-beta emission with P-Cygni type profiles and by many weak Fe I and Fe II emission lines. Short-timescale variability was measured in the continuum and in line emission. The mid-IR spectrum of V1647 Ori is flat and featureless at all epochs. However, the energy distribution changed drastically: V1647 Ori was much redder in the early outburst than in the final phases. These data are consistent with the occurence of a disk instability which led to a strong increase in the mass accretion rate onto the central star. The magnitude and rise of the outburst of V1647 Ori resemble that of an FUOR, while the duration and recurrence of the outburst resemble that of an EXOR. The optical spectrum of V1647 Ori is clearly distinct from that of both FUORs and EXORs. The presence of objects such as V1647 Ori with intermediate characteristics between these two classes of young violent stars, suggests that FUOR and EXOR outburst, as well as these newly discovered intermediate objects, may all be due to one physical mechanism. We discuss these in terms of the thermal instability model.
Fedele Davide
Petr-Gotzens Monika
Rafanelli Piero
van den Ancker Mario E.
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