Electronic Telegram No. 760
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
CBAT@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/iau/cbat.html


ERUPTIVE YOUNG STELLAR OBJECT IN LDN 1415
     J. Kastner and M. Richmond, Rochester Institute of Technology; T.
Simon, Institute for Astronomy, Honolulu; N. Grosso, Laboratoire
d'Astrophysique de Grenoble; D. Weintraub, Vanderbilt University; and
K. Hamaguchi, Universities Space Research Association, Greenbelt,
report that they obtained a 9630-s Director's Discretionary Time
exposure on Nov. 18 with the Chandra X-ray Observatory's Advanced CCD
Imaging Spectrometer imaging array (ACIS-I) of a field centered at R.A.
= 4h41m35s.8, Decl. = +54d19'20" (equinox 2000.0), the position of a
low-luminosity, eruptive, young stellar object reported by Stecklum
(CBET 690).  No x-ray source is detected within several arcminutes of
this position.  The upper limit on the (0.5- to 8.0-keV) Chandra/ACIS-I
count rate within a 10"-radius circular aperture centered on the
Stecklum position is < 0.67 count/ks (99-percent confidence; Kraft et
al. 1991, Ap.J. 374, 344); this corresponds to an upper limit on
observed x-ray fluxes of < 3.9 x 10**(-15) and < 5.0 x 10**(-15) erg
cm**(-2) s**(-1) for assumed plasma temperatures of 10 and 30 MK,
respectively.  The emergent source x-ray luminosity is hence
constrained to be less than about 2 x 10**(28) erg s**(-1), assuming
that the distance to the L1415 cloud is 170 pc.  The intrinsic source
x-ray luminosity is not well constrained, however, given that the star
is likely encircled by a circumstellar disk that is viewed almost
edge-on (Stecklum et al. 2006, http://xxx.lanl.gov/abs/astro-ph/?0611314).


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                         (C) Copyright 2006 CBAT
2006 November 27                 (CBET 760)               Daniel W. E. Green