Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000head....5.2407m&link_type=abstract
American Astronomical Society, HEAD Meeting #5, #24.07; Bulletin of the American Astronomical Society, Vol. 32, p.1218
Astronomy and Astrophysics
Astronomy
Scientific paper
We present results of analyses of observations of the X-ray source 2A 1704+241 with the ROSAT Position Sensitive Proportional Counter (PSPC) and the High Resolution Imager (HRI). 2A 1704+241 was first associated with the M-giant star HD 154791 based upon observations with the HEAO 1 SMC and the {Einstein} IPC and analysis of a spectrum of HD 154791 obtained with the International Ultraviolet Explorer. This identification was unusual because there are few bright X-ray binaries associated with an M-giant star. We observed {2A 1704+241} with the PSPC and the HRI in order to determine more accurately the position of the X-ray source and in order to study the previously-seen 900-second variability in the Einstein data. Based upon the previous identification and determination of the position of MS 1703.7+2417, an AGN in the field, and the position of three previously-unreported X-ray sources that we have associated with stars in the USNO-A2.0 catalog, we have confirmed the identification of the optical counterpart of the X-ray source {2A 1704+241} as HD 154791. In addition, we determine that there is little evidence for the 900-sec modulation seen by the Einstein IPC in the more recent PSPC data, and that there is no phase coherence in what modulation is noticeable.
Garcia Murillo R.
Morgan Windsor Anthony Jr.
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