A Revised Calibration of the MV-W(O I 7774) Relationship using Hipparcos Data: Its Application to Cepheids and Evolved Stars
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| Format: | Artículo científico |
| Language: | en |
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Universidad Nacional Autónoma de México
2003
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| _version_ | 1876457376950779904 |
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| author | A. Arellano Ferro |
| author_facet | A. Arellano Ferro |
| contents | A Revised Calibration of the MV-W(O I 7774) Relationship using Hipparcos Data: Its Application to Cepheids and Evolved Stars A. Arellano Ferro S. Giridhar E. Rojo Arellano Física, Astronomía y Matemáticas AGB CEPHEIDS HERTZSPRUNG RUSSELL DIAGRAM STARS: AGB AND POST A new calibration of the MV {W(O I 7774) relationship has been calculatedusing better reddening and distance estimates for a sample of 27 calibrator starsof spectral types A to G, based on accurate parallaxes and proper motions fromthe Hipparcos and Tycho catalogues. The present calibration predicts absolutemagnitude with accuracies of _0:38 mag for a sample covering a large range of MV ,from _9:5 to +0:35 mag. The color term included in a previous paper has beendropped since its inclusion does not lead to any significant improvement in thecalibration. The variation of the O I 7774 feature in the classical cepheid SS Scthas been studied. We calculated a phase-dependent correction to random phaseOI feature strengths in Cepheids, such that it predicts mean absolute magnitudesusing the above calibration. After applying such a correction, we could increase thelist of calibrators to 58 by adding MV and O I triplet strength data for 31 classicalCepheids. The standard error of the calibration using the composite sample wascomparable to that obtained from the primary 27 calibrators, showing that it ispossible to calculate mean Cepheid luminosities from random phase observations ofthe O I 7774 feature. We use our derived calibrations to estimate MV for a set ofevolved objects to be able to locate their positions in the HR diagram. 2003 artículo científico 0185-1101 https://www.redalyc.org/articulo.oa?id=57139101 en http://www.redalyc.org/revista.oa?id=571 Revista Mexicana de Astronomía y Astrofísica application/pdf Universidad Nacional Autónoma de México Revista Mexicana de Astronomía y Astrofísica (México) Num.1 Vol.39 |
| format | Artículo científico |
| id | redalyc_57139101 |
| institution | Redalyc |
| language | en |
| publishDate | 2003 |
| publisher | Universidad Nacional Autónoma de México |
| spellingShingle | A Revised Calibration of the MV-W(O I 7774) Relationship using Hipparcos Data: Its Application to Cepheids and Evolved Stars A. Arellano Ferro Física, Astronomía y Matemáticas AGB CEPHEIDS HERTZSPRUNG RUSSELL DIAGRAM STARS: AGB AND POST A Revised Calibration of the MV-W(O I 7774) Relationship using Hipparcos Data: Its Application to Cepheids and Evolved Stars A. Arellano Ferro S. Giridhar E. Rojo Arellano Física, Astronomía y Matemáticas AGB CEPHEIDS HERTZSPRUNG RUSSELL DIAGRAM STARS: AGB AND POST A new calibration of the MV {W(O I 7774) relationship has been calculatedusing better reddening and distance estimates for a sample of 27 calibrator starsof spectral types A to G, based on accurate parallaxes and proper motions fromthe Hipparcos and Tycho catalogues. The present calibration predicts absolutemagnitude with accuracies of _0:38 mag for a sample covering a large range of MV ,from _9:5 to +0:35 mag. The color term included in a previous paper has beendropped since its inclusion does not lead to any significant improvement in thecalibration. The variation of the O I 7774 feature in the classical cepheid SS Scthas been studied. We calculated a phase-dependent correction to random phaseOI feature strengths in Cepheids, such that it predicts mean absolute magnitudesusing the above calibration. After applying such a correction, we could increase thelist of calibrators to 58 by adding MV and O I triplet strength data for 31 classicalCepheids. The standard error of the calibration using the composite sample wascomparable to that obtained from the primary 27 calibrators, showing that it ispossible to calculate mean Cepheid luminosities from random phase observations ofthe O I 7774 feature. We use our derived calibrations to estimate MV for a set ofevolved objects to be able to locate their positions in the HR diagram. 2003 artículo científico 0185-1101 https://www.redalyc.org/articulo.oa?id=57139101 en http://www.redalyc.org/revista.oa?id=571 Revista Mexicana de Astronomía y Astrofísica application/pdf Universidad Nacional Autónoma de México Revista Mexicana de Astronomía y Astrofísica (México) Num.1 Vol.39 |
| title | A Revised Calibration of the MV-W(O I 7774) Relationship using Hipparcos Data: Its Application to Cepheids and Evolved Stars |
| topic | Física, Astronomía y Matemáticas AGB CEPHEIDS HERTZSPRUNG RUSSELL DIAGRAM STARS: AGB AND POST |
| url | https://www.redalyc.org/articulo.oa?id=57139101 |