HR 4289 - an X-ray luminous galaxy close to the bright star.
Abstract
Using new optical, UV and X-ray observations we show that the K5 III star HR 4289, formerly believed to be the only ROSAT All-Sky survey detection to the right of the coronal diving line, should not be identified with the X-ray source. Pointed ROSAT PSPC observations demonstrate that the X-ray source is slightly extended, and locate the X-ray source 30" northwest of HR 4289 at the position of a hitherto unknown 15nag galaxy. The X-ray spectrum can well be fitted with a Raymond-Smith model for a thermal plasma at 6(+/-2)x10^6^K and a hydrogen column density of N_H_=3(+/-2)x10^21^cm^-2^. At a distance of z=0.016 (96 h_50_^-1^Mpc), the galaxy has an X-ray luminosity of L_x_=1.4x10^42^h_50_^-2^erg/s between 0.1 and 2.4keV.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- September 1996
- Bibcode:
- 1996A&A...313..755H
- Keywords:
-
- STARS: INDIVIDUAL: HR 4289;
- GALAXIES: STARBURST;
- X-RAYS: GALAXIES;
- X-RAYS: STARS