Full metadata record
DC Field | Value | Language |
---|---|---|
dc.contributor.author | 안덕근 | * |
dc.date.accessioned | 2016-08-27T04:08:23Z | - |
dc.date.available | 2016-08-27T04:08:23Z | - |
dc.date.issued | 2015 | * |
dc.identifier.issn | 0004-637X | * |
dc.identifier.issn | 1538-4357 | * |
dc.identifier.other | OAK-15868 | * |
dc.identifier.uri | https://dspace.ewha.ac.kr/handle/2015.oak/217740 | - |
dc.description.abstract | We extend our effort to calibrate stellar isochrones in the Johnson-Cousins (BVIC) and the 2MASS (JHK(s)) filter systems based on observations of well-studied open clusters. Using cool main-sequence (MS) stars in Praesepe, we define empirical corrections to the Lejeune et al. color-effective temperature (T-eff) relations down to T-eff similar to 3600 K, complementing our previous work based on the Hyades and the Pleiades. We apply empirically corrected isochrones to existing optical and near-infrared photometry of cool (T-eff less than or similar to 5500 K) and metal-rich ([Fe/H] = +0.37) MS stars in NGC 6791. The current methodology relies on an assumption that color-T-eff corrections are independent of metallicity, but we find that estimates of color excess and distance from color-magnitude diagrams with different color indices converge on each other at the precisely known metallicity of the cluster. Along with a satisfactory agreement with eclipsing binary data in the cluster, we view the improved internal consistency as a validation of our calibrated isochrones at super-solar metallicities. For very cool stars (T-eff less than or similar to 4800 K), however, we find that B - V colors of our models are systematically redder than the cluster photometry by similar to 0.02 mag. We use color-T-eff transformations from the infrared flux method and alternative photometry to examine a potential color-scale error in the input cluster photometry. After excluding B - V photometry of these cool MS stars, we derive E(B - V) = 0.105 +/- 0.014, [M/H] = +0.42 +/- 0.07, (m - M)(0) = 13.04 +/- 0.08, and the age of 9.5 +/- 0.3 Gyr for NGC 6791. | * |
dc.language | English | * |
dc.publisher | IOP PUBLISHING LTD | * |
dc.subject | Hertzsprung-Russell and C-M diagrams | * |
dc.subject | open clusters and associations: individual (Hyades, Pleiades, Praesepe, NGC 6791) | * |
dc.subject | stars: distances | * |
dc.title | THE DISTANCES TO OPEN CLUSTERS FROM MAIN-SEQUENCE FITTING. V. EXTENSION OF COLOR CALIBRATION AND TEST USING COOL AND METAL-RICH STARS IN NGC 6791 | * |
dc.type | Article | * |
dc.relation.issue | 1 | * |
dc.relation.volume | 811 | * |
dc.relation.index | SCI | * |
dc.relation.index | SCIE | * |
dc.relation.index | SCOPUS | * |
dc.relation.journaltitle | ASTROPHYSICAL JOURNAL | * |
dc.identifier.doi | 10.1088/0004-637X/811/1/46 | * |
dc.identifier.wosid | WOS:000363471600047 | * |
dc.identifier.scopusid | 2-s2.0-84945571082 | * |
dc.author.google | An, Deokkeun | * |
dc.author.google | Terndrup, Donald M. | * |
dc.author.google | Pinsonneault, Marc H. | * |
dc.author.google | Lee, Jae-Woo | * |
dc.contributor.scopusid | 안덕근(8661118800) | * |
dc.date.modifydate | 20240130115827 | * |