Two Neighbor FUor-like Objects in Cygnus

Details Two Neighbor FUor-like Objects in Cygnus Two Neighbor FUor-like Objects in Cygnus

Aug 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007jena.confe..28n&link_type=abstract

"JENAM-2007, "Our non-stable Universe", held 20-25 August 2007 in Yerevan, Armenia. Abstract book, p. 28-28"

Physics

Optics

Scientific paper

We present the results of investigation of two variable nebulae in Cygnus: “Braid” and IRAS 20568+2017. Optical images of the field including these objects were obtained using in 2006 SUPRIMECAM on the SUBARU 8 telescope. Data through narrow band Halpha and [S II] filters and broad band R and I filters were acquired. Near infrared observations of the same region were made, again in 2006, using WFCAM on the UKIRT 3.8m telescope. A narrow band molecular hydrogen filter (2.122 microns) and broad band K filters were used. The illuminating source of the “Braid” nebula, still invisible in optics, is already proved as FU Ori type object. It is also the source of extended HH-outflow. Our new deep images show that this outflow has well-marked periodicity of eruptive mass loss. In southwest direction from “Braid” nebula on a distance ~50¢ the nebula, illuminated by the star, known as IRAS 20658+5217, is located. We found that this nebula also is variable and its central star rose in brightness for ~2.5 magnitudes in 1953-2006. This object is the probable source of the several known and newly found HH-objects, which define the large-scale bipolar outflow. The long-slit spectrum of the star, obtained on 6 m telescope (SAO, Russia) in 2007, confirms that it is the PMS object and a source of the intensive bipolar optical outflow. The IR spectrum of this object, obtained in 1996, is very similar to L1551 IRS5 and suggests its close relation to FU Ori-like objects.

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