V1647 Ori (IRAS 05436-0007) in Outburst: the First Three Months

Details V1647 Ori (IRAS 05436-0007) in Outburst: the First Three Months V1647 Ori (IRAS 05436-0007) in Outburst: the First Three Months

2004-06-28

arxiv.org/abs/astro-ph/0406618v1

Astronomy and Astrophysics

Astrophysics

Accepted for publication in the Astronomical Journal

Scientific paper

10.1086/423703

We report on photometric (BVRIJHK) and low dispersion spectroscopic observations of V1647 Ori, the star that drives McNeil's Nebula, between 10 February and 7 May 2004. The star is photometrically variable atop a general decline in brightness of about 0.3-0.4 magnitudes during these 87 days. The spectra are featureless, aside from H-alpha and the Ca II infrared triplet in emission, and a Na I D absorption feature. The Ca II triplet line ratios are typical of young stellar objects. The H-alpha equivalent width may be modulated on a period of about 60 days. The post-outburst extinction appears to be less than 7 mag. The data are suggestive of an FU Orionis-like event, but further monitoring will be needed to definitively characterize the outburst.

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