ROSAT observations of soft X-ray transients in quiescence

Details ROSAT observations of soft X-ray transients in quiescence ROSAT observations of soft X-ray transients in quiescence

May 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...285..903v&link_type=abstract

Astronomy and Astrophysics 285, 903-911 (1994)

Astronomy and Astrophysics

Astrophysics

85

X-Rays: Stars, Accretion, Stars: Gs 2023+338, Aql X-1, H 1705-25, Gs 2000+25

Scientific paper

Aql X-1 has been detected in five observations with ROSAT, at X-ray luminosities varying from L_x_(0.4-2.4 keV)~4 x 10^32^ erg/s to ~2 x 10^36^ erg/s. The characteristic temperature of the X-rays varies from kT_bb_=~0.31 keV at the lowest to kT_bb_=~0.55 keV at the highest flux level observed. This moderate temperature variation excludes models that explain the large range in X-ray luminosity as the consequence mainly of a variation in temperature, and implies that accretion onto the neutron star drops by five orders of magnitude between outburst maximum (at L_x_~10^37^ erg/s) and quiescence. Three other soft X-ray transients, all black hole candidates, were also observed with ROSAT. GS 2023+338 was detected at L_x_(0.4-2.4 keV)=~1.5 x 10^33^ erg/s (for a distance d = 3.5 kpc). For H 1705-25 an upper limit of L_x_<~4.9 x 10^32^ erg/s (d=3 kpc) was obtained, and for GS 2000+25 an upper limit of L_x_<~1.0 x 10^31^ erg/s (d=2 kpc).

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