The Infrared Colors Of The Sun

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dc.contributor.utaustinauthorRamirez, Ivanen_US
dc.creatorCasagrande, L.en_US
dc.creatorRamirez, Ivanen_US
dc.creatorMelendez, Jorgeen_US
dc.creatorAsplund, Martinen_US
dc.date.accessioned2016-04-28T19:37:01Z
dc.date.available2016-04-28T19:37:01Z
dc.date.issued2012-12en
dc.description.abstractSolar infrared colors provide powerful constraints on the stellar effective temperature scale, but they must be measured with both accuracy and precision in order to do so. We fulfill this requirement by using line-depth ratios to derive in a model-independent way the infrared colors of the Sun, and we use the latter to test the zero point of the Casagrande et al. effective temperature scale, confirming its accuracy. Solar colors in the widely used Two Micron All Sky Survey (2MASS) JHK(s) and WISE W1-4 systems are provided: (V - J)(circle dot) = 1.198, (V - H)(circle dot) = 1.484, (V - K-s)(circle dot) = 1.560, (J - H)(circle dot) = 0.286, (J - K-s)(circle dot) = 0.362, (H - K-s)(circle dot) = 0.076, (V - W1)(circle dot) = 1.608, (V - W2)(circle dot) = 1.563, (V - W3)(circle dot) = 1.552, and (V - W4)(circle dot) = 1.604. A cross-check of the effective temperatures derived implementing 2MASS or WISE magnitudes in the infrared flux method confirms that the absolute calibration of the two systems agrees within the errors, possibly suggesting a 1% offset between the two, thus validating extant near-and mid-infrared absolute calibrations. While 2MASS magnitudes are usually well suited to derive T-eff, we find that a number of bright, solar-like stars exhibit anomalous WISE colors. In most cases, this effect is spurious and can be attributed to lower-quality measurements, although for a couple of objects (3%+/- 2% of the total sample) it might be real, and may hint at the presence of warm/hot debris disks.en_US
dc.description.departmentAstronomyen_US
dc.description.sponsorshipNASAen_US
dc.description.sponsorshipFAPESP 2010/17510-3en_US
dc.description.sponsorshipCNPqen_US
dc.description.sponsorshipNational Aeronautics and Space Administrationen_US
dc.description.sponsorshipNational Science Foundationen_US
dc.description.sponsorshipCalifornia Institute of Technology (Caltech)en_US
dc.identifierdoi:10.15781/T25R7V
dc.identifier.Filename2012_12_infraredcolors.pdfen_US
dc.identifier.citationCasagrande, L., I. Ram�rez, J. Mel�ndez, and M. Asplund. "The infrared colors of the Sun." The Astrophysical Journal, Vol. 761, No. 1 (Dec., 2012): 16.en_US
dc.identifier.doi10.1088/0004-637x/761/1/16en_US
dc.identifier.issn0004-637Xen_US
dc.identifier.urihttp://hdl.handle.net/2152/34918
dc.language.isoEnglishen_US
dc.relation.ispartofen_US
dc.relation.ispartofserialAstrophysical Journalen_US
dc.rightsAdministrative deposit of works to Texas ScholarWorks: This works author(s) is or was a University faculty member, student or staff member; this article is already available through open access or the publisher allows a PDF version of the article to be freely posted online. The library makes the deposit as a matter of fair use (for scholarly, educational, and research purposes), and to preserve the work and further secure public access to the works of the University.en_US
dc.rights.restrictionOpenen_US
dc.subjectstars: fundamental parametersen_US
dc.subjectsun: fundamental parametersen_US
dc.subjecttechniques:en_US
dc.subjectphotometricen_US
dc.subjectgeneva-copenhagen surveyen_US
dc.subjectlate-type starsen_US
dc.subjectspectral irradianceen_US
dc.subjectcalibrationen_US
dc.subjectbvri photometric systemsen_US
dc.subjectsolar-type starsen_US
dc.subjectdebris disksen_US
dc.subjectmodel atmospheresen_US
dc.subjectmain-sequenceen_US
dc.subjectt-effen_US
dc.subjecteffective temperaturesen_US
dc.subjectastronomy & astrophysicsen_US
dc.titleThe Infrared Colors Of The Sunen_US
dc.typeArticleen_US

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