A Spitzer/IRAC Characterization of AGB Stars

Details A Spitzer/IRAC Characterization of AGB Stars A Spitzer/IRAC Characterization of AGB Stars

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...21110401r&link_type=abstract

American Astronomical Society, AAS Meeting #211, #104.01; Bulletin of the American Astronomical Society, Vol. 39, p.924

Other

Scientific paper

We present a characterization of Asymptotic Giant Branch (AGB) stars in the Spitzer Space Telescope's InfraRed Array Camera (IRAC) photometric system. We confirm that stars with higher mass loss rates are redder in colors involving the 8.0 micron band while colors computed with other bands are strongly influenced by photospheric dust and molecular features. We find that carbon and S-type stars are generally more luminous than the O-rich stars, in agreement with their expected mass class. The period of AGB stars of Mira or semiregular variability type is only loosely correlated with the luminosity of the star --- stars with longer period tend to have higher luminosity. We do, however, find a tight period-color relation for the semiregular variables, which is not observed in Miras. This suggests that semiregular variables lack hot dust responsible for the infrared excess in the IRAC bands for the Miras. This is perhaps due to a discontinuous mass loss process for semiregulars as proposed in Marengo et al. (2001), in contrast to the continuous mass loss rates observed in Miras.
Support for this work was provided by NASA through an award issued by JPL/Caltech, and by the National Science Foundation's Research Experience for Undergraduates Program.

Affiliated with

Also associated with

No associations

Rating

A Spitzer/IRAC Characterization of AGB Stars does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with A Spitzer/IRAC Characterization of AGB Stars, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A Spitzer/IRAC Characterization of AGB Stars will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1480661