Optical and infrared observations of the suspected Be/X-ray transient 4U 0728-25.

Details Optical and infrared observations of the suspected Be/X-ray transient 4U 0728-25. Optical and infrared observations of the suspected Be/X-ray transient 4U 0728-25.

Nov 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...315..160n&link_type=abstract

Astronomy and Astrophysics, v.315, p.160-165

Astronomy and Astrophysics

Astrophysics

10

Stars: Individual: 4U 0728-25, X-Ray: Stars, Bursts

Scientific paper

We present new optical spectra and photometry plus the first infrared photometry of the optical counterpart to the X-ray transient system 4U 0728-25. Our spectral and photometrical analysis lead us to conclude that the primary is an O8-9Ve star with E(B-V)=0.75+/-0.02. This revised spectral classification places the star at a distance of 6.1+/-0.3 kpc. We also present evidence for an unusual faint, blue state that may represent a diskless phase in late 1991.

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