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Astron. Astrophys. 350, L31-L34 (1999)

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2. Observations and data reduction

RX J1624.9+7554 was observed during the RASS between October 07, 1990 10:13 and October 15, 1990 23:12 for a total of 1510 s. Photons were extracted in a circle of [FORMULA] radius for the source and two circles of [FORMULA] in scan direction for the background. The two pointed observations were performed on January 13, 1992 (ROR: 141820p and 141829p) and had exposures of 2373 and 2923 s, respectively.

Optical spectra were taken in 1998 with the 2.1m telescope at McDonald Observatory/Texas (McD). We took two spectra, one with a [FORMULA] slit (5 min) and one with a [FORMULA] slit (45 min). The weather conditions were good, with clear skies and [FORMULA] seeing. The spectral resolution was about 7 Å (FWHM). Two 20-minute spectra were taken with a 1.7" slit at the 2.4m Hiltner telescope at the Michigan-Dartmouth-MIT Observatory (MDM) in February 1999. Weather conditions were good with some light clouds. The spectral resolution was approximately 4.5 Å. Three 2-minute R band exposures were obtained by I. Yadigaroglu at MDM in January 1999. Optical polarimetry was performed in March 1998 using the broad-band polarimeter at the 2.1m at McDonald Observatory. A description of these measurements is given in Grupe et al. (1998b) and references therein.

Data reduction was performed with EXSAS (Zimmermann et al. 1998) for the ROSAT data and MIDAS and FIGARO for the optical data.

Infrared data from the IRAS satellite were retrieved using the interactive XSCANPI program at the Infrared Processing and Analysis Center (IPAC) available on the WWW. The scans were made at the optical position of the source.

All luminosities are calculated for [FORMULA] and [FORMULA]=0.5.

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© European Southern Observatory (ESO) 1999

Online publication: October 4, 1999