Poster Open Access
Spitzer IRAC Photometry of K Giants Used as Spectro-Photometric Standards for IRS
Kraemer, K. E.;
Engelke, C. W.;
Sloan, G. C.
Editor(s)
Wolk, ScottWe used Spitzer's IRAC at 3.6 and 4.5 um to observe 36 K giants which were spectro-photometric standard stars for Spitzer's IRS. To compare the data from IRAC and the IRS, we generate synthetic photometry from ISO/SWS-based spectral templates to bridge the gap between the end of the spectra and the photometric bands. We applied two methods for selecting templates, both of which confirmed a match of ~1% between the observed and synthetic photometry at 3.6 um. Choosing the templates based on the optical-NIR photometry and effective temperature of the star produced a match of <1% at 4.5 um, with small but noticeable discrepancies in the 8 um SiO absorption band for some stars. Choosing the templates to match the 8 um band in the IRS data required somewhat higher temperatures and showed a weak temperature dependence for the 4.5 um photometric ratios. Thus, we were unable to simultaneously fit both the SiO absorption band at 8 um and the IRAC photometry at 4.5 um with the templates. The discrepancy at 4.5 um was small, less than 2%, but this result points to the continued challenge of using K giants as spectro-photometric standards.
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Engelke et al. 2006, AJ, 132, 1445, doi: 10.1086/505865
Monson et al. 2012, ApJ, 759, 146, doi: 10.1088/0004-637X/759/2/146
Reach et al. 2005, PASP, 117, 978, doi: 10.1086/432670
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- Publication date:
- February 26, 2021
- DOI:
-
- Keyword(s):
- Post main sequence cool stars
- Meeting:
- The 20.5th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun (CS20.5), virtually anywhere, March 2-4, 2021
- Communities:
- License (for files):
- Creative Commons Attribution 4.0 International