Identification and properties of the M giant/X-ray system HD 154791 = 2A 1704+241

Details Identification and properties of the M giant/X-ray system HD 154791 = 2A 1704+241 Identification and properties of the M giant/X-ray system HD 154791 = 2A 1704+241

Apr 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...267..291g&link_type=abstract

Astrophysical Journal, Part 1, vol. 267, Apr. 1, 1983, p. 291-300. Consejo Nacional de Ciencia y Technologia

Astronomy and Astrophysics

Astrophysics

33

Binary Stars, Giant Stars, Late Stars, M Stars, Ultraviolet Spectra, X Ray Sources, Heao 2, Iue, Neutron Stars, Radial Velocity, Stellar Models, Stellar Spectra

Scientific paper

The Aerial V X-ray source 2A 1704+241 (= 4U 1700+24 = 3A 1703+241) is identified with the M3 II star HD 154791. The identification is based on a precise X-ray position determined by the HEAO 1 scanning modulation collimator and the Einstein Observatory imaging proportional counter, together with a spectrum measured by the International Ultraviolet Explorer. The ultraviolet spectrum shows strong emission of C IV 1550 A, N v 1238 A, and Mg II 2800 A, which is very unusual among M giants. This is the first X-ray detection of an M giant which has a completely normal optical spectrum. The X-ray luminosity reaches three orders of magnitude above the mean upper limit for the coronal X-ray flux from M giants. Although there is no direct evidence for a binary system, since radial velocity variations have not been observed, it is shown that a plausible neutron star binary model can be constructed.

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