[IAUC] CBET 2428: 20100827 : NEW VARIABLE STAR IN CYGNUS

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                                                  Electronic Telegram No. 2428
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
CBAT Director:  Daniel W. E. Green; Room 209; Dept. of Earth and Planetary
 Sciences; Harvard University; 20 Oxford St.; Cambridge, MA  02138; U.S.A.
e-mail:  cbat en iau.org; cbatiau en eps.harvard.edu
URL http://www.cfa.harvard.edu/iau/cbat.html


NEW VARIABLE STAR IN CYGNUS
     U. Munari, Istituto Nazionale di Astrofisica, Padova Astronomical
Observatory; and P. Valisa and S. Dallaporta, "Asiago Novae and Symbiotic
Stars" (ANS) collaboration, have observed the new variable star discovered
by K. Itagaki and announced on CBET 2426.  A low-resolution, absolutely
calibrated spectrum (range 480-880 nm; 0.42 nm/pixel) was recorded on Aug.
26.825 UT with the 0.6-m telescope of the Schiaparelli Observatory in Varese,
equipped with a multi-mode grating spectrograph.  The noisy spectrum displays
a very red, featureless continuum with absorptions visible for H_beta, Mg I
(517.4 nm), and Na I (518.9, 519.5 nm), as well as emission from H_alpha and
the Ca II triplet in the far red (849.8, 854.2, 866.2 nm).  The H_alpha
emission line displays a narrow P-Cyg profile.  The emission component has an
integrated flux of 1.6 x 10**(-13) erg cm**(-2) s**(-1), a full-width-at-
half-maximum (FWHM) of 350 km/s, and an heliocentric radial velocity of +60
km/s.  The absorption component has an equivalent width of 0.5 nm and an
heliocentric radial velocity of -160 km/s.  The overall spectral appearance
is compatible with a classification as an FU Orionis-type star.  CCD
photometry, properly corrected for color equations, provides the following
magnitudes for the new variable on Aug. 26.83:  B = 16.93, V = 14.91, R_c =
13.57, I_c = 12.31.


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                         (C) Copyright 2010 CBAT
2010 August 27                   (CBET 2428)              Daniel W. E. Green