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Discovery of a likely FU-Ori-type system

ATEL # 2307; P. Wils (Vereniging Voor Sterrenkunde, Belgium), J. Greaves (Northamptonshire, UK); M. Catelan (PUC, Chile); S.G. Djorgovski, A.J. Drake, M.J. Graham, A.A. Mahabal, R. Williams (Caltech); E.C. Beshore, S.M. Larson (LPL/UA); E. Christensen (Gemini Observatory)
on 21 Nov 2009; 7:28 UT
Password Certification: Andrew J. Drake (ajd@cacr.caltech.edu)

Subjects: Infra-Red, Optical, Transients, Variables, Stars

We report the discovery of a possible FU-Ori-type eruption. The object CSS091110:060919-064155 located at R.A. = 06h09m19.32s, Decl. = -06d41'55.4" (equinox 2000.0) and coincident with the infrared source IRAS 06068-0641, was detected by the Catalina Real-time Transient Survey (CRTS) on 10 November 2009. It has been continuously brightening from at least early 2005 (when it was mag 14.8 on unfiltered CCD images) to the present mag 12.6, and may possibly brighten further. On recent images a faint cometary reflection nebula is visible to the East. A spectrum (range 350-900nm) taken with the SMARTS 1.5m-telescope on Cerro Tololo on 17 November shows H-alpha in emission, all other Balmer lines and HeI (at 501.5nm) in absorption, and a very strong Ca II infrared triplet in emission, confirming it to be a young stellar object. The object lies inside a dark nebula to the South of the Mon R2 association, and is likely related with it.

In addition, also inside this dark nebula, a second object at R.A. = 06h09m13.70s, Decl. = -06d43'55.6", coincident with IRAS 06068-0643, has been varying between mag 15 and 20 over the past few years, reminiscent of UX-Ori-type objects with very deep fades. Also this second object supports a variable cometary reflection nebula, extending to the North. The spectrum of this object also shows H-alpha and the strong Ca II infrared triplet in emission.

Light curves, spectra and images are available at this url: http://crts.caltech.edu/CSS091110.html
Additional follow-up is requested.


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