IPCOSTARS - Einstein Count Rates for IPC O Stars
This information, derived from the Einstein X-ray Observatory Catalog of
O-type Stars, by Chlebowski, Harnden and Sciortino, provides information
regarding the Soft X-ray measurements for all normal, massive, O-type stars
serveyed with The Einstein Observatory. More information is available through
Chlebowski T., Harnden, F.R., and Sciortino, S. 1989, ApJ, 341, 427
A number assigned to the source for the purpose of this catalog.
The Right Ascension of the object.
The Declination of the object.
The Galactic longitude of the object.
The Galactic latitude of the object.
Name derived either from the Henry Draper identification or the Bonner
The Einstein "sequence" number(s) for each target. Multiple observations of a
given object are indicated by the apperance of more than one sequence number.
The total exposure time (live time) in seconds for each target.
This is a flag for the X-ray count rate which is set to 0 if it is a
detection, or 1 if it is an upper limit for a non-detection.
The corrected count rate (per 10e3x), and for objects which failed the
detection criteria, an upper bound is given, as indicated by a flag notation of
`1`. The data is given in counts per second, which is instrument dependent.
The data offered here is not suggested for direct comparison between
instruments. Additional information is available from the HEASARC.
The corrected count rate 1-sigma error.
The instrument used to observe the target. An `I` indicates IPC data, an
`H` indicates HRI data.
The composite correction factor used in converting from counts to incident
This indicates whether the star was a target of a serendipitous observation,
according to the following notation: `T` indicates the source was observed as
target during all observations; an `S` means at least once the source was
neither a target nor a member of a targeted assosciation, cluster, or nebula;
and an `X` marks all other cases (mostly members of targeted associations).
The method used to determine the background in the vicinity of each source.
Questions regarding the IPCOSTARS database table can be addressed to the
HEASARC User Hotline.
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