1996A&A...315..160N

Query : 1996A&A...315..160N

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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Number of rows : 2
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 V* X Per HXB 03 55 23.0777456088 +31 02 45.039836148 6.090 6.840 6.720     O9.5III 978 0
2 V* V441 Pup HXB 07 28 53.5788273168 -26 06 28.897118208 11.27 12.29 11.83 11.53   O5Ve 81 0

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