Astronomy and Astrophysics – Astronomy
Scientific paper
May 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.262...57e&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 262, no. 1, p. 57-62.
Astronomy and Astrophysics
Astronomy
8
Emission Spectra, Hydrogen Recombinations, Infrared Stars, Stellar Spectra, X Ray Binaries, Accretion Disks, Extremely High Frequencies, H I Regions, Interstellar Matter
Scientific paper
We present the first 2.0-2.5 m spectra of four Be/X-ray binaries, at a resolution of lambda/Delta lambda = 310-400. The spectra show strong hydrogen recombination lines, notably Br-gamma and, in most cases, the higher order Pfund series. The relative recombination strengths-imply that Br-gamma has a large optical depth, whereas the Pfund lines have relative strengths close to case B and so may be optically thin. The He I 2.06-micron line is also in emission. Mg II emission lines are present, as are Na I lines; the latter are normally associated with emission-zone temperatures that are cooler than the conventional Be-star circumstellar disk. We conclude that optical effects are evident in H I line emission.
Coe Malcolm J.
Everall C.
Norton Andrew J.
Roche Paul
Unger Sarah J.
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