Theoretical isochrones with extinction in the K band

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dc.contributor.author Kim, Sungsoo en_US
dc.contributor.author Figer, Donald en_US
dc.contributor.author Lee, Myung Gyoon en_US
dc.contributor.author Oh, Seungkyung en_US
dc.date.accessioned 2006-06-09T13:49:53Z en_US
dc.date.available 2006-06-09T13:49:53Z en_US
dc.date.issued 2005-05 en_US
dc.identifier.citation Publications of the Astronomical Society of the Pacific 117N5 (2005) 445-461 en_US
dc.identifier.issn 1538-3873 en_US
dc.identifier.uri http://hdl.handle.net/1850/1966 en_US
dc.description Also archived in: arXiv:astro-ph/0505089 v1 5 May 2005 en_US
dc.description.abstract We calculate theoretical isochrones, in a consistent way, for five filters in the atmospheric window between 1.9 µm and 2.5 µm, K, K′, Ks, F205W, and F222M, using the Padova stellar evolutionary models by Girardi et al. Even when displayed in the same Vega magnitude system, the near-infrared colors of the same isochrone can differ by up to 0.18 mag at its bright end, depending on the filter. We present magnitude transformations between K-band filters as a function of color from H & K band filters. Isochrones with extinction at K of up to 6 mag are also presented. We find that care is needed when comparing extinction values that are estimated using different filter sets in the K-band, in particular when comparing those between atmospheric and space filter sets: extinction values for space filters can be in error by up to 0.3 mag. To reduce this error, we introduce an “effective extinction slope” for each filter set and isochrone model, which describes the extinction behaviour of isochrones in the color-magnitude diagram more correctly than the actual extinction law. Our calculation also suggests that the extinction law implied by the observations of Rieke, Rieke, & Paul for wavelengths between H and K bands is better described by a power-law function with an exponent of 1.61, instead of 1.55, which is commonly used with an assumption that the transmission functions of H and K filters are Dirac delta functions. (Refer to PDF file for exact formulas). en_US
dc.description.sponsorship This work was supported by the research fund from Kyung Hee University. S.S.K. was supported by the Astrophysical Research Center for the Structure and Evolution of the Cosmos (ARCSEC) of Korea Science and Engineering Foundation through the Science Research Center (SRC) program. M.G.L. was in part supported by the ABRL (R14-2002-058-01000-0) and the BK21 program. en_US
dc.format.extent 1330076 bytes en_US
dc.format.mimetype application/pdf en_US
dc.language.iso en_US en_US
dc.publisher University of Chicago Press: Publications of the Astronomical Society of the Pacific en_US
dc.relation.ispartofseries vol. 117 en_US
dc.relation.ispartofseries no. 5 en_US
dc.relation.ispartofseries issue 831 en_US
dc.relation.ispartofseries pps. 445-461 en_US
dc.subject Hertzsprung-Russell diagram en_US
dc.subject Stars-fundamental parameters en_US
dc.subject Stars-infrared en_US
dc.subject Techniques-photometric en_US
dc.title Theoretical isochrones with extinction in the K band en_US
dc.type Article en_US

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