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).

Publication Date



Note: imported from RIT’s Digital Media Library running on DSpace to RIT Scholar Works in February 2014.

Document Type


Department, Program, or Center

Chester F. Carlson Center for Imaging Science (COS)


RIT – Main Campus