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CHASFRXRAY: Help

CHASFRXRAY - ROSAT All-Sky Survey: Chamaeleon Star Forming Region Study


Overview

This catalog contains a source list derived from observations of the ROSAT all-sky survey (RASS) in the direction of the Chamaeleon star-forming region cloud complex, as well as spectroscopic identifications for the detected X-ray sources. The main purpose of this identification program was the search for low-mass pre-main sequence stars. Sixteen previously known PMS stars were detected with high confidence by ROSAT: eight are classical T Tauri stars and eight are weak-line T Tauri stars. Seventy-seven new weak-line T Tauri stars were identified on the basis of the presence of strong Li 6707 Angstrom absorption, a spectral type later than F0, and chromospheric emission. In addition, 6 new dKe-dMe candidates were found among the RASS sources. Coordinates and count rates are given for all of the X-ray sources.

Catalog Bibcode

1995A&AS..114..109A

References

A study of the Chamaeleon star forming region from the ROSAT all-sky survey. I. X-ray observations and optical identifications Alcala J.M., Krautter, J., Schmitt J.H.M.M., Covino E., Wichmann R., Mundt R. <Astron. Astrophys. Suppl. Ser. 114, 109 (1995)> =1995A&AS..114..109A (SIMBAD/NED BibCode)

Provenance

This online catalog was created by the HEASARC in September 1999 based on a machine-readable table obtained from the ADC/CDS data centers (J/A+AS/114/109).

Parameters

Name
The RXJ X-ray source designation.

RA
The Right Ascension of the X-ray source.

Dec
The Declination of the X-ray source.

LII
The galactic longitude of the X-ray source.

BII
The galactic latitude of the X-ray source.

Count_Rate
The ROSAT PSPC count rate in cts/s.

Count_Rate_Error
The RMS uncertainty in the count rate, in cts/s.

Optical_ID
The proposed optical identification for the X-ray source.

Offset
The offset between the positions of the X-ray source and the proposed optical counterpart, in arcseconds.

Spect_Type
The spectral type of the (stellar) optical counterpart.

Object_Type
A code describing the type of the optical counterpart in those cases when it could be identified with no ambiguity:

            W  : previously known weak-line T Tauri star
            C  : previously known classical T Tauri star
            Wn : new weak-line T Tauri star
            UAS: unrelated active star
            UBS: unrelated bright star
            IR : infrared source
            QS : quasar
            RS : radio source
            G  : galaxy
  

Note
A note describing the appearance of the optical counterpart in the finding chart:

          ST.: Stellar
         GAL.: galaxy
        FAINT: object fainter than V~20.
          A  : source investigated spectroscopically, but without stellar
               counterpart found.
          B  : source not investigated. Its corresponding error circle contains
               objects fainter than our limit for the spectroscopic
               observations (V~17mag).
          C  : very strong spectroscopic and photometric variability
               (Alcala et al. 1993A&A...272..225A).
          D  : H-alpha filled-in with emission but no Li I 6707A absorption.
          E  : Li I 6707A absorption to be confirmed because of low S/N of
               the spectrum.
  

Refs
A code for references to the object:

            1: this catalog
            2: Simbad catalog (see ROSAT PSPC, Cat. <IX/11>)
            3: Gauvin and Strom (1992ApJ...385..217G)
            4: Feigelson and Kriss (1989ApJ...338..262F)
            5: Hyland et al. (1982MNRAS.201.1095H)
            6: Hughes and Hartigan (1992AJ....104..680H)
            7: Walter (1992AJ....104..758W)
            8: Feigelson et al. (1993ApJ...416..623F)
            9: Huenemoerder et al. (1994MNRAS.271..967H)
  

Class
BROWSE classification type. The classification is based on the Object_Type parameter.


Contact Person

Questions regarding the CHASFRXRAY database table can be addressed to the HEASARC User Hotline.
If you have any problems, please consult the help page or mail ledas-help@star.le.ac.uk
 
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