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HD 179871


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ROSAT observations of the W 50/SS 433 system.
SS 433 and the surrounding supernova remnant W 50 were observed inseveral pointings between March 1991 and March 1993 with the PSPConboard ROSAT for a total of more than 60ksec. The soft X-ray flux fromSS 433 varies by up to a factor of two but no clear correlation could befound with precessional or binary phase. The temperature of the best fitthermal spectrum cannot be constrained accurately, but kT>2keV. TheN_H_ value towards SS 433 itself seems to be higher than to the rest ofthe remnant. The two oppositely directed X-ray jets show differentmorphological and spectral properties indicating a strong influence ofthe surrounding matter onto the energy loss mechanism of the jet. Thespectrum of the eastern jet is non-thermal with a power law photon index{GAMMA}~1.6. The jet terminates in a region with thermal emission withstrong spatial similarities between the X-ray and the radio structures.The western jet has a considerably softer X-ray spectrum, either ofthermal origin or with a steep power law ( {GAMMA}>2.3).

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Datos observacionales y astrométricos

Constelación:Águila
Ascensión Recta:19h14m05.58s
Declinación:+05°03'17.1"
Magnitud Aparente:9.751
Movimiento Propio en Ascensión Recta:9.4
Movimiento Propio en Declinación:0.1
B-T magnitude:10.197
V-T magnitude:9.788

Catálogos y designaciones:
Nombres Propios   (Edit)
HD 1989HD 179871
TYCHO-2 2000TYC 471-254-1
USNO-A2.0USNO-A2 0900-14273789

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