CHASFRXRAY - ROSAT All-Sky Survey: Chamaeleon Star Forming Region Study
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.
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
This online catalog was created by the HEASARC in September 1999
based on a machine-readable table obtained from the ADC/CDS data centers
The RXJ X-ray source designation.
The Right Ascension of the X-ray source.
The Declination of the X-ray source.
The galactic longitude of the X-ray source.
The galactic latitude of the X-ray source.
The ROSAT PSPC count rate in cts/s.
The RMS uncertainty in the count rate, in cts/s.
The proposed optical identification for the X-ray source.
The offset between the positions of the X-ray source and the
proposed optical counterpart, in arcseconds.
The spectral type of the (stellar) optical counterpart.
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
A note describing the appearance of the optical counterpart in
the finding chart:
FAINT: object fainter than V~20.
A : source investigated spectroscopically, but without stellar
B : source not investigated. Its corresponding error circle contains
objects fainter than our limit for the spectroscopic
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
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)
BROWSE classification type. The classification is based on the
Questions regarding the CHASFRXRAY database table can be addressed to the
HEASARC User Hotline.
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