SIMBAD references

1996A&A...315..160N - Astronomy and Astrophysics, volume 315, 160-165 (1996/11-1)

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

NEGUERUELA I., ROCHE P., BUCKLEY D.A.H., CHAKRABARTY D., COE M.J., FABREGAT J. and REIG P.

Abstract (from CDS):

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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Journal keyword(s): stars: individual: 4U 0728-25 - X-ray: stars, bursts

Simbad objects: 2

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