Spectroscopic studies of 4U1735 - 44 - Evidence for binary motion

Details Spectroscopic studies of 4U1735 - 44 - Evidence for binary motion Spectroscopic studies of 4U1735 - 44 - Evidence for binary motion

Mar 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984mnras.207p..29s&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 207, March 15, 1984, p. 29P-36P.

Astronomy and Astrophysics

Astronomy

7

Binary Stars, Interstellar Extinction, Stellar Motions, Stellar Spectra, X Ray Sources, Bursts, Neutron Stars

Scientific paper

The authors have obtained optical spectroscopy of the X-ray burst source 4U 1735-44 with spectral resolution of ≡1.6 Å and a time resolution of ≡30 min. There is strong evidence for cyclic He II velocity variations, but the authors are unable to confirm or deny either of the previously reported possible binary periodicities in the source. However, kinematic arguments suggest that the companion can be classified as being of spectral type F0 - K5 V and the presence of the Ca II K interstellar absorption line at λ3933 leads to a lower limit on the distance of the source of ≡2.0 kpc.

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