Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...246l..81p&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 246, no. 2, June 1991, p. L81-L83.
Astronomy and Astrophysics
Astrophysics
8
Accretion Disks, H Alpha Line, Hydrogen, Stellar Mass Accretion, Stellar Spectrophotometry, X Ray Binaries, Charge Coupled Devices, Emission Spectra, Giant Stars, Neutron Stars, X Ray Stars
Scientific paper
The optical counterpart of the Z source GX 349 + 2 was identified with an 18th magnitude star, whose spectrum shows strong H-alpha-emission. If this emission originates from rotating material in an accretion disk around the neutron star, a lower limit to the orbital period of 1.0 x sin-cubed (i) day is derived. If the companion is a giant, for spectral type G5 and M2 upper limits to the orbital period of 11.2 and 19.5 days, respectively are derived. The reddening toward the source is A(v) about 5.
Augusteijn Th.
Penninx Wim
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