All-sky Faint DA White Dwarf Spectrophotometric Standards for Astrophysical Observatories: The Complete Sample
Hot DA white dwarfs (DAWDs) have fully radiative pure hydrogen atmospheres that are the least complicated to model. Pulsationally stable, they are fully characterized by their effective temperature T _eff and surface gravity $\mathrm{log}\,g$ , which can be deduced from their optical spectra and use...
| Main Authors: | , , , , , , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2023-01-01
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| Series: | The Astrophysical Journal |
| Subjects: | |
| Online Access: | https://doi.org/10.3847/1538-4357/acd333 |
| _version_ | 1797694196497252352 |
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| author | Tim Axelrod Abhijit Saha Thomas Matheson Edward W. Olszewski Ralph C. Bohlin Annalisa Calamida Jenna Claver Susana Deustua Jay B. Holberg Ivan Hubeny John W. Mackenty Konstantin Malanchev Gautham Narayan Sean Points Armin Rest Elena Sabbi Christopher W. Stubbs |
| author_facet | Tim Axelrod Abhijit Saha Thomas Matheson Edward W. Olszewski Ralph C. Bohlin Annalisa Calamida Jenna Claver Susana Deustua Jay B. Holberg Ivan Hubeny John W. Mackenty Konstantin Malanchev Gautham Narayan Sean Points Armin Rest Elena Sabbi Christopher W. Stubbs |
| author_sort | Tim Axelrod |
| collection | DOAJ |
| description | Hot DA white dwarfs (DAWDs) have fully radiative pure hydrogen atmospheres that are the least complicated to model. Pulsationally stable, they are fully characterized by their effective temperature T _eff and surface gravity $\mathrm{log}\,g$ , which can be deduced from their optical spectra and used in model atmospheres to predict their spectral energy distributions (SEDs). Based on this, three bright DAWDs have defined the spectrophotometric flux scale of the CALSPEC system of the Hubble Space Telescope (HST). In this paper we add 32 new fainter (16.5 < V < 19.5) DAWDs spread over the whole sky and within the dynamic range of large telescopes. Using ground-based spectra and panchromatic photometry with HST/WFC3, a new hierarchical analysis process demonstrates consistency between model and observed fluxes above the terrestrial atmosphere to <0.004 mag rms from 2700 to 7750 Å and to 0.008 mag rms at 1.6 μ m for the total set of 35 DAWDs. These DAWDs are thus established as spectrophotometric standards with unprecedented accuracy from the near-ultraviolet to the near-infrared, suitable for both ground- and space-based observatories. They are embedded in existing surveys like the Sloan Digital Sky Survey, Pan-STARRS, and Gaia, and will be naturally included in the Large Synoptic Survey Telescope survey by the Rubin Observatory. With additional data and analysis to extend the validity of their SEDs further into the infrared, these spectrophotometric standard stars could be used for JWST, as well as for the Roman and Euclid observatories. |
| first_indexed | 2024-03-12T02:54:26Z |
| format | Article |
| id | doaj.art-b6eb1350c6b34f49ba29ec75e9eed043 |
| institution | Directory Open Access Journal |
| issn | 1538-4357 |
| language | English |
| last_indexed | 2024-03-12T02:54:26Z |
| publishDate | 2023-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj.art-b6eb1350c6b34f49ba29ec75e9eed0432023-09-03T15:25:36ZengIOP PublishingThe Astrophysical Journal1538-43572023-01-0195117810.3847/1538-4357/acd333All-sky Faint DA White Dwarf Spectrophotometric Standards for Astrophysical Observatories: The Complete SampleTim Axelrod0https://orcid.org/0000-0002-5722-7199Abhijit Saha1https://orcid.org/0000-0002-6839-4881Thomas Matheson2https://orcid.org/0000-0001-6685-0479Edward W. Olszewski3https://orcid.org/0000-0002-7157-500XRalph C. Bohlin4https://orcid.org/0000-0001-9806-0551Annalisa Calamida5https://orcid.org/0000-0002-0882-7702Jenna Claver6Susana Deustua7https://orcid.org/0000-0003-2823-360XJay B. Holberg8https://orcid.org/0000-0003-3082-0774Ivan Hubeny9https://orcid.org/0000-0001-8816-236XJohn W. Mackenty10https://orcid.org/0000-0001-6529-8416Konstantin Malanchev11https://orcid.org/0000-0001-7179-7406Gautham Narayan12https://orcid.org/0000-0001-6022-0484Sean Points13https://orcid.org/0000-0002-4596-1337Armin Rest14https://orcid.org/0000-0002-4410-5387Elena Sabbi15https://orcid.org/0000-0003-2954-7643Christopher W. Stubbs16https://orcid.org/0000-0003-0347-1724The University of Arizona , Steward Observatory, 933 North Cherry Avenue, Tucson, AZ 85721, USA ; taxelrod@as.arizona.eduNSF’s National Optical Infrared Astronomy Research Laboratory , 950 North Cherry Avenue, Tucson, AZ 85719, USANSF’s National Optical Infrared Astronomy Research Laboratory , 950 North Cherry Avenue, Tucson, AZ 85719, USAThe University of Arizona , Steward Observatory, 933 North Cherry Avenue, Tucson, AZ 85721, USA ; taxelrod@as.arizona.eduSpace Telescope Science Institute , 3700 San Martin Drive, Baltimore, MD 21218, USASpace Telescope Science Institute , 3700 San Martin Drive, Baltimore, MD 21218, USANSF’s National Optical Infrared Astronomy Research Laboratory , 950 North Cherry Avenue, Tucson, AZ 85719, USASpace Telescope Science Institute , 3700 San Martin Drive, Baltimore, MD 21218, USA; Sensor Science Division, National Institute of Standards and Technology , Gaithersburg, MD 20899-8441, USAThe University of Arizona , Lunar and Planetary Laboratory, 1629 East University Boulevard, Tucson, AZ 85721, USAThe University of Arizona , Steward Observatory, 933 North Cherry Avenue, Tucson, AZ 85721, USA ; taxelrod@as.arizona.eduSpace Telescope Science Institute , 3700 San Martin Drive, Baltimore, MD 21218, USAUniversity of Illinois at Urbana-Champaign , 1002 W. Green Street, Urbana, IL 61801, USAUniversity of Illinois at Urbana-Champaign , 1002 W. Green Street, Urbana, IL 61801, USACerro Tololo Inter-American Observatory , Casilla 603, La Serena, ChileSpace Telescope Science Institute , 3700 San Martin Drive, Baltimore, MD 21218, USA; Department of Physics and Astronomy, Johns Hopkins University , Baltimore, MD 21218, USASpace Telescope Science Institute , 3700 San Martin Drive, Baltimore, MD 21218, USAHarvard University , Department of Physics, 17 Oxford Street, Cambridge, MA 02138, USA; Harvard-Smithsonian Center for Astrophysics , 60 Garden Street, Cambridge, MA 02138, USAHot DA white dwarfs (DAWDs) have fully radiative pure hydrogen atmospheres that are the least complicated to model. Pulsationally stable, they are fully characterized by their effective temperature T _eff and surface gravity $\mathrm{log}\,g$ , which can be deduced from their optical spectra and used in model atmospheres to predict their spectral energy distributions (SEDs). Based on this, three bright DAWDs have defined the spectrophotometric flux scale of the CALSPEC system of the Hubble Space Telescope (HST). In this paper we add 32 new fainter (16.5 < V < 19.5) DAWDs spread over the whole sky and within the dynamic range of large telescopes. Using ground-based spectra and panchromatic photometry with HST/WFC3, a new hierarchical analysis process demonstrates consistency between model and observed fluxes above the terrestrial atmosphere to <0.004 mag rms from 2700 to 7750 Å and to 0.008 mag rms at 1.6 μ m for the total set of 35 DAWDs. These DAWDs are thus established as spectrophotometric standards with unprecedented accuracy from the near-ultraviolet to the near-infrared, suitable for both ground- and space-based observatories. They are embedded in existing surveys like the Sloan Digital Sky Survey, Pan-STARRS, and Gaia, and will be naturally included in the Large Synoptic Survey Telescope survey by the Rubin Observatory. With additional data and analysis to extend the validity of their SEDs further into the infrared, these spectrophotometric standard stars could be used for JWST, as well as for the Roman and Euclid observatories.https://doi.org/10.3847/1538-4357/acd333Spectrophotometric standardsDA starsWhite dwarf starsHST photometry |
| spellingShingle | Tim Axelrod Abhijit Saha Thomas Matheson Edward W. Olszewski Ralph C. Bohlin Annalisa Calamida Jenna Claver Susana Deustua Jay B. Holberg Ivan Hubeny John W. Mackenty Konstantin Malanchev Gautham Narayan Sean Points Armin Rest Elena Sabbi Christopher W. Stubbs All-sky Faint DA White Dwarf Spectrophotometric Standards for Astrophysical Observatories: The Complete Sample The Astrophysical Journal Spectrophotometric standards DA stars White dwarf stars HST photometry |
| title | All-sky Faint DA White Dwarf Spectrophotometric Standards for Astrophysical Observatories: The Complete Sample |
| title_full | All-sky Faint DA White Dwarf Spectrophotometric Standards for Astrophysical Observatories: The Complete Sample |
| title_fullStr | All-sky Faint DA White Dwarf Spectrophotometric Standards for Astrophysical Observatories: The Complete Sample |
| title_full_unstemmed | All-sky Faint DA White Dwarf Spectrophotometric Standards for Astrophysical Observatories: The Complete Sample |
| title_short | All-sky Faint DA White Dwarf Spectrophotometric Standards for Astrophysical Observatories: The Complete Sample |
| title_sort | all sky faint da white dwarf spectrophotometric standards for astrophysical observatories the complete sample |
| topic | Spectrophotometric standards DA stars White dwarf stars HST photometry |
| url | https://doi.org/10.3847/1538-4357/acd333 |
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