RGB photometric calibration of 15 million Gaia stars

Although the use of RGB photometry has exploded in the last decades due to the advent of high-quality and inexpensive digital cameras equipped with Bayer-like color filter systems, there is surprisingly no catalogue of bright stars that can be used for calibration purposes. Since due to their excess...

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Autores: Cardiel López, Nicolás, Zamorano Calvo, Jaime, Bará, Salvador, Sánchez De Miguel, Alejandro, Cabello González, Cristina, Gallego Maestro, Jesús, García, Lucía, González, Rafael, Izquierdo Gómez, Jaime, Pascual Ramírez, Sergio, Sánchez Penim, Ainhoa, Tapia Ayuga, Carlos
Tipo de recurso: artículo
Fecha de publicación:2021
País:España
Institución:Universidad Complutense de Madrid (UCM)
Repositorio:Docta Complutense
Idioma:inglés
OAI Identifier:oai:docta.ucm.es:20.500.14352/4523
Acceso en línea:https://hdl.handle.net/20.500.14352/4523
Access Level:acceso abierto
Palabra clave:52
Instrumentation-photometers
Techniques
Photometric
Catalogues
Stars
General
Astrofísica
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spelling RGB photometric calibration of 15 million Gaia starsCardiel López, NicolásZamorano Calvo, JaimeBará, SalvadorSánchez De Miguel, AlejandroCabello González, CristinaGallego Maestro, JesúsGarcía, LucíaGonzález, RafaelIzquierdo Gómez, JaimePascual Ramírez, SergioSánchez Penim, AinhoaTapia Ayuga, Carlos52Instrumentation-photometersTechniquesPhotometricCataloguesStarsGeneralAstrofísicaAlthough the use of RGB photometry has exploded in the last decades due to the advent of high-quality and inexpensive digital cameras equipped with Bayer-like color filter systems, there is surprisingly no catalogue of bright stars that can be used for calibration purposes. Since due to their excessive brightness, accurate enough spectrophotometric measurements of bright stars typically cannot be performed with modern large telescopes, we have employed historical 13-color medium-narrow-band photometric data, gathered with quite reliable photomultipliers, to fit the spectrum of 1346 bright stars using stellar atmosphere models. This not only constitutes a useful compilation of bright spectrophotometric standards well spread in the celestial sphere, the UCM library of spectrophotometric spectra, but allows the generation of a catalogue of reference RGB magnitudes, with typical random uncertainties ∼ 0.01 mag. For that purpose, we have defined a new set of spectral sensitivity curves, computed as the median of 28 sets of empirical sensitivity curves from the literature, that can be used to establish a standard RGB photometric system. Conversions between RGB magnitudes computed with any of these sets of empirical RGB curves and those determined with the new standard photometric system are provided. Even though particular RGB measurements from single cameras are not expected to provide extremely accurate photometric data, the repeatability and multiplicity of observations will allow access to a large amount of exploitable data in many astronomical fields, such as the detailed monitoring of light pollution and its impact on the night sky brightness, or the study of meteors, solar system bodies, variable stars, and transient objects. In addition, the RGB magnitudes presented here make the sky an accessible and free laboratory for the calibration of the cameras themselves.WileyUniversidad Complutense de Madrid20212021-10-0120212021-10-01journal articlehttp://purl.org/coar/resource_type/c_6501info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/20.500.14352/4523reponame:Docta Complutenseinstname:Universidad Complutense de Madrid (UCM)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:docta.ucm.es:20.500.14352/45232026-06-02T12:44:21Z
dc.title.none.fl_str_mv RGB photometric calibration of 15 million Gaia stars
title RGB photometric calibration of 15 million Gaia stars
spellingShingle RGB photometric calibration of 15 million Gaia stars
Cardiel López, Nicolás
52
Instrumentation-photometers
Techniques
Photometric
Catalogues
Stars
General
Astrofísica
title_short RGB photometric calibration of 15 million Gaia stars
title_full RGB photometric calibration of 15 million Gaia stars
title_fullStr RGB photometric calibration of 15 million Gaia stars
title_full_unstemmed RGB photometric calibration of 15 million Gaia stars
title_sort RGB photometric calibration of 15 million Gaia stars
dc.creator.none.fl_str_mv Cardiel López, Nicolás
Zamorano Calvo, Jaime
Bará, Salvador
Sánchez De Miguel, Alejandro
Cabello González, Cristina
Gallego Maestro, Jesús
García, Lucía
González, Rafael
Izquierdo Gómez, Jaime
Pascual Ramírez, Sergio
Sánchez Penim, Ainhoa
Tapia Ayuga, Carlos
author Cardiel López, Nicolás
author_facet Cardiel López, Nicolás
Zamorano Calvo, Jaime
Bará, Salvador
Sánchez De Miguel, Alejandro
Cabello González, Cristina
Gallego Maestro, Jesús
García, Lucía
González, Rafael
Izquierdo Gómez, Jaime
Pascual Ramírez, Sergio
Sánchez Penim, Ainhoa
Tapia Ayuga, Carlos
author_role author
author2 Zamorano Calvo, Jaime
Bará, Salvador
Sánchez De Miguel, Alejandro
Cabello González, Cristina
Gallego Maestro, Jesús
García, Lucía
González, Rafael
Izquierdo Gómez, Jaime
Pascual Ramírez, Sergio
Sánchez Penim, Ainhoa
Tapia Ayuga, Carlos
author2_role author
author
author
author
author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv Universidad Complutense de Madrid
dc.subject.none.fl_str_mv 52
Instrumentation-photometers
Techniques
Photometric
Catalogues
Stars
General
Astrofísica
topic 52
Instrumentation-photometers
Techniques
Photometric
Catalogues
Stars
General
Astrofísica
description Although the use of RGB photometry has exploded in the last decades due to the advent of high-quality and inexpensive digital cameras equipped with Bayer-like color filter systems, there is surprisingly no catalogue of bright stars that can be used for calibration purposes. Since due to their excessive brightness, accurate enough spectrophotometric measurements of bright stars typically cannot be performed with modern large telescopes, we have employed historical 13-color medium-narrow-band photometric data, gathered with quite reliable photomultipliers, to fit the spectrum of 1346 bright stars using stellar atmosphere models. This not only constitutes a useful compilation of bright spectrophotometric standards well spread in the celestial sphere, the UCM library of spectrophotometric spectra, but allows the generation of a catalogue of reference RGB magnitudes, with typical random uncertainties ∼ 0.01 mag. For that purpose, we have defined a new set of spectral sensitivity curves, computed as the median of 28 sets of empirical sensitivity curves from the literature, that can be used to establish a standard RGB photometric system. Conversions between RGB magnitudes computed with any of these sets of empirical RGB curves and those determined with the new standard photometric system are provided. Even though particular RGB measurements from single cameras are not expected to provide extremely accurate photometric data, the repeatability and multiplicity of observations will allow access to a large amount of exploitable data in many astronomical fields, such as the detailed monitoring of light pollution and its impact on the night sky brightness, or the study of meteors, solar system bodies, variable stars, and transient objects. In addition, the RGB magnitudes presented here make the sky an accessible and free laboratory for the calibration of the cameras themselves.
publishDate 2021
dc.date.none.fl_str_mv 2021
2021-10-01
2021
2021-10-01
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/20.500.14352/4523
url https://hdl.handle.net/20.500.14352/4523
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Wiley
publisher.none.fl_str_mv Wiley
dc.source.none.fl_str_mv reponame:Docta Complutense
instname:Universidad Complutense de Madrid (UCM)
instname_str Universidad Complutense de Madrid (UCM)
reponame_str Docta Complutense
collection Docta Complutense
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,300719

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