FIRST NEAR INFRARED SPECTRUM OF V1118Ori

ATel #619; A. Di Paola (INAF - Osservatorio Astronomico di Roma (Italy)), D. Lorenzetti (INAF - Osservatorio Astronomico di Roma (Italy)), L. Calzoletti (INAF - Osservatorio Astronomico di Roma (Italy)), T. Giannini (INAF - Osservatorio Astronomico di Roma (Italy)), A. A.Arkarov (Central Astronomical Observatory of Pulkovo, St. Petersburg (Russia)), V. M.Larionov (Astronomical Institute of St. Petersburg University (Russia))
on 5 Oct 2005; 14:06 UT
Credential Certification: Andrea Di Paola (dipaola@mporzio.astro.it)

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On (Sept. 11, 2005) the first near infrared (0.87 – 2.35 μm) spectrum of the EXOR variable V1118Ori was obtained in low resolution mode (R ~ 250), with the AZT24 telescope at Campo Imperatore (Italy). It presents strong hydrogen recombination lines of the Brackett and Paschen series, some ionic emission features possibly attributable to [FeII], and also emission in the overtone bands of CO (v = 2-0, v = 3-1). These latter reveal the existence of dense and excited neutral gas. The rovibrational H2 line 1-0 S(1) at 2.122 μm is marginally detected, as well. JHK magnituides are 11.23, 10.45 and 9.85, respectively, indicating (in comparison with our April 2005 data by Di Paola et al. ATEL #514) that the object is now slowly fading, but has not yet reached its quiescent phase (2MASS data). To our knowledge, this is the first near infrared spectrum of V1118Ori which resembles that of some active T Tauri stars.

V1118 Ori observations from Campo Imperatore