IR Compendium: Gamma Velorum || SPITZER HOME || SPITZER SCIENCE || COMPENDIUM HOME || EXAMPLES INDEX ||

Table of Contents

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

Basic Information

• Common name: Gamma Velorum

• Other names:HD68273, IRAS 08079-4711, WR 11

• Position:RA= 08h09m31.95s Dec= -47d20m11.72s

• Type: WC star, Wolf-Rayet star

• Parallax: 3.88 mas (HIPPARCOS Catalog)

Gamma Velorum is an example of a Wolf-Rayet Star with clear emission lines of Neon. ISO-LWS spectra show the fine structure lines of [CII], [NII], [NIII] and [OIII] which are used to determine abundances of C, N, and O in the outer winds of the star. Unlike other Wolf-Rayet stars observed by ISO, Gamma Velorum lacks any emission features caused by carbon dust.

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)

5 degree IRAS 12 micron image centered on Gamma Velorum ( Retrieve IRAS images using OASIS)

5 degree IRAS 100 micron image centered on Gamma Velorum ( Retrieve IRAS images using OASIS)

Infrared Spectra

click images for full 2 to 40 micron spectra with ISO-SWS (Search the ISO archive)

click on image for full 40 to 200 micron spectra with ISO-LWS (Search the ISO archive)

Spitzer Observations

• This object is part of a GTO program to obtain MIPS and IRAC observations to study disk evolution. (Program ID number 37)
  (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

• The ISO-SWS post-helium atlas of near-infrared stellar spectra, Vandenbussche, B., Beintema, D., de Graauw, T., Decin, L., Feuchtgruber, H., Heras, A., Kester, D., Lahuis, F., Lenorzer, A., Lorente, R., Salama, A., Waelkens, C., Waters, L., Wieprecht, E., 2002, A&A, 390, 1033.
• Terminal Speeds and Ion Fractions from [Ca IV] 3.207 microns in Three Single WN Stars,Ignace, R., Cassinelli, J. P., Quigley, M., Babler, B., 2001, ApJ, 558, 771.
• Quantitative analysis of WC stars: constraints on neon abundances from ISO-SWS spectroscopy, Dessart, Luc, Crowther, Paul A., John Hillier, D., Willis, Allan J., Morris, Patrick W., van der Hucht, Karel A., 2000, MNRAS, 315, 407.
• ISO-SWS spectrophotometry of galactic Wolf-Rayet stars: preliminary results., van der Hucht, K. A., Morris, P. W., Williams, P. M., Setia Gunawan, D. Y. A., Beintema, D. A., Boxhoorn, D. R., de Graauw, T., Heras, A., Kester, D. J. M., Lahuis, F., Leech, K. J., Roelfsema, P. R., Salama, A., Valentijn, E. A., Vandenbussche, B., 1996, A&A, 315, 193.