RX J185635-3754 is a bright soft X-ray source. It has been detected on 5
occasions, by 4 instruments on 3 satellites, over a 20 year interval. There is
no evidence for variability.
- EINSTEIN IPC
Slew Survey (1ES1853-379): 0.86 +/- 0.42 counts/s.
- ROSAT PSPC All Sky Survey:
3.67 +/- 0.15 counts/s (12 scans between 9/14 and 10/2 1990).
- ROSAT PSPC pointing:
3.62 +/- 0.03 counts/s (6322 seconds on
11 and 16 October 1992). Each circular field is 2 degrees in diameter.
The cluster at the center is the
R CrA association of (mostly) naked T Tauri stars.
The neutron star is the bright source to the lower right, and is
14.6 arcmin off-axis in this pointing.
- ROSAT HRI pointing:
0.56 +/- 0.005 counts/s (17,800 seconds on
7-8 October 1994). RX J185635-3754 is at the center of the field;
the star used for the boresight correction is located near the west
(right) edge of the field.
This image is about 40 arcmin across.
- EUVE Deep Survey Spectrometer:
0.0384 +/- 0.0003 counts/s (582 ksec between 18 June
and 19 July 1997).
Other observations include:
- BeppoSAX: scheduled, 3-4 October 1997
- ASCA: scheduled, 11 October 1997
- ROSAT HRI: scheduled, 9-15 October 1997
The X-ray spectrum (from the ROSAT PSPC) is consistent with a black body,
with kT = 57 +/- 1 eV and nH = 1.4 +/-
0.1 X 1020 cm-2.
This column corresponds to AV=0.07 mag for R=3.1.
There is no evidence for any X-ray variability.
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