ISO-ChaI 192: A new embedded eruptive variable in the Chamaeleon I dark cloud?

PERSI, P., TAPIA, M., GOMEZ, M., WHITNEY, B. A., MARENZI, A. R., ROTH, M.

ASTRONOMICAL JOURNAL

IOP PUBLISHING LTD

Lugar: Londres; Año: 2007 p. 1690 - 1697

0004-6256

We report the detection of an increase of about 2 magnitudes in the 2.2 microns brightness of ISO-ChaI 192, a Class I low-mass stellar object thought to be responsible of a bipolar CO outflow in the Chamaeleon I cloud. This substantial brightness change has taken place during a period of about 7.2 yr, from April 1996 till May 2003. Combining our new ground-based near- and mid-infrared photometry with Spitzer IRAC and MIPS broad-band fluxes supplemented by published recent spectrophotometry, the spectral energy distribution (SED) of this source was constructed. We explored the plausibility of a ´´standard´´ configuration of infalling envelope+disk+central source for this object by fitting a two-dimensional radiative transfer code that includes the contributions of each of these components. An elongated reflection nebula of size about 530 AU is seen parallel to the direction of the bipolar outflow originating from the star. The historic infrared properties of this young stellar object are examined in order to substantiate the hypothesis that this object is an FU-Ori type system.