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Table of Contents

• Basic information
• Infrared Fluxes
• Spectral Energy Distributions
• Infrared Images
• Infrared Spectra
• Spitzer Observations
• Further Reading

Basic Information

• Common name: Cha H Alpha 1

• Other names: ISO-ChaI 95, IRAS 11058-7721

• Position:RA= 11h07m16.8s Dec=-77d35m57s (J2000)

• Type: brown dwarf, M7.5-8

• Radial Velocity: v=+15.5 km/s (Joergens, V., Guenther, E., 2001, A&A, 379, 9)

Cha H Alpha 1 was the first brown dwarf detected in the X-ray (detected with ROSAT). Its status as a brown dwarf has been confirmed by both near IR colors and spectroscopy. This is the only confirmed brown dwarf observed with ISO, and it is tentatively identified as IRAS point source 11058-7721.

Infrared Fluxes

Spectral Energy Distributions

This SED was created using the sensitivity and saturation values available in November 2004. The black dots are the flux values from the above table. The green and red lines are the respective sensitivity and saturation limits for each instrument. The sensitivity values used are for a 5 sigma detection of a point source with a 500 second exposure.

Infrared images

DSS 2nd Generation Red (Search the DSS)

2MASS K band (Search the 2MASS Quicklook Image Server)

ISO-CAM 6.7 microns (Search the ISO archive)

5 degree IRAS 12 micron image centered on Cha H Alpha 1 ( Retrieve IRAS images using OASIS)

ISO-CAM 14.3 microns (Search the ISO archive)

ISO-PHT 60 microns (Search the ISO archive)

ISO-PHT 80 microns (Search the ISO archive)

5 degree IRAS 100 micron image centered on Cha H Alpha 1 ( Retrieve IRAS images using OASIS)

ISO-PHT 100 microns (Search the ISO archive)

ISO-PHT 150 microns (Search the ISO archive)

Spitzer Observations

• This object is part of multiple GTO and Legacy programs using all three Spitzer instruments. (Program ID numbers 2, 36, 37, 173)
  (You can download the AORs (Astronomical Observation Requests) for this object into Spot by using "View Program" under the "File" menu and entering these program IDs.)
• Search the ROC for planned observations

Further reading

• Near-infrared spectra of ISO selected Chamaeleon I young stellar objects, Gómez, M., Persi, P., 2002, A&A, 389, 494.
• A 3 μm Survey of the Chamaeleon I Dark Cloud, Kenyon, S. J., Gómez, M., 2001, AJ, 121, 2673.
• A Near-Infrared Imaging Survey of the Chamaeleon I Dark Cloud, Gómez, M., Kenyon, S. J., 2001, AJ, 121, 974.
• Probing the brown dwarf population of the Chamaeleon I star forming region, Comerón, F., Neuhäuser, R., Kaas, A. A., 2000, A&A, 359, 269.
• ISOCAM observations of the Chamaeleon I dark cloud, Persi, P., Marenzi, A. R., Olofsson, G., Kaas, A. A., Nordh, L., Huldtgren, M., Abergel, A., André, P., Bontemps, S., Boulanger, F., Burggdorf, M., Casali, M. M., Cesarsky, C. J., Copet, E., Davies, J., Falgarone, E., Montmerle, T., Perault, M., Prusti, T., Puget, J. L,; Sibille, F., 2000, A&A, 357, 219,.
• Medium-resolution optical spectroscopy of young stellar and sub-stellar M-dwarfs in the Cha I dark cloud, Neuhäuser, R.; Comerón, F., 1999, A&A, 350, 612.
• Faint members of the Chamaeleon I cloud, Comerón, F.; Rieke, G. H.; Neuhäuser, R., 1999, A&A, 343, 477.
• ROSAT X-ray Detection of a Young Brown Dwarf in the Chamaeleon I Dark Cloud, Neuhäuser, R., Comerón, F., 1998, Science, 282, 83.