Ca II H and K filter photometry on the uvby system. I, The standard system
A fifth filter (fwhm = 90 A) centered on Ca II H and K has been developed for use with the standard uvby system. The filter, called Ca, is designed primarily for applications to metal-poor dwarfs and red giants, regions where the uvby metallicity index, m(l), loses some sensitivity. An index, hk, is...
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| Veröffentlicht in: | The Astronomical journal 1991-05, Vol.101 (5), p.1902-1914 |
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| container_end_page | 1914 |
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| container_issue | 5 |
| container_start_page | 1902 |
| container_title | The Astronomical journal |
| container_volume | 101 |
| creator | ANTHONY-TWAROG, B. J LAIRD, J. B PAYNE, D TWAROG, B. A |
| description | A fifth filter (fwhm = 90 A) centered on Ca II H and K has been developed for use with the standard uvby system. The filter, called Ca, is designed primarily for applications to metal-poor dwarfs and red giants, regions where the uvby metallicity index, m(l), loses some sensitivity. An index, hk, is defined by replacing v in m(l) by Ca. The effects of interstellar extinction on the index are modeled and demonstrated to be modest and relatively insensitive to spectral type. Observations of V, (b-y), and hk for 163 primary standards are detailed and transformed to the standard V and (b-y) system. A qualitative analysis using only the primary standards indicates that hk is more sensitive than m(l) over the regions of interest by about a factor of 3. (Author) |
| doi_str_mv | 10.1086/115815 |
| format | Article |
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B</creatorcontrib><creatorcontrib>PAYNE, D</creatorcontrib><creatorcontrib>TWAROG, B. A</creatorcontrib><title>Ca II H and K filter photometry on the uvby system. I, The standard system</title><title>The Astronomical journal</title><description>A fifth filter (fwhm = 90 A) centered on Ca II H and K has been developed for use with the standard uvby system. The filter, called Ca, is designed primarily for applications to metal-poor dwarfs and red giants, regions where the uvby metallicity index, m(l), loses some sensitivity. An index, hk, is defined by replacing v in m(l) by Ca. The effects of interstellar extinction on the index are modeled and demonstrated to be modest and relatively insensitive to spectral type. Observations of V, (b-y), and hk for 163 primary standards are detailed and transformed to the standard V and (b-y) system. 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A</creator><general>University of Chicago Press</general><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>8FD</scope><scope>H8D</scope><scope>L7M</scope><scope>OTOTI</scope></search><sort><creationdate>19910501</creationdate><title>Ca II H and K filter photometry on the uvby system. I, The standard system</title><author>ANTHONY-TWAROG, B. J ; LAIRD, J. B ; PAYNE, D ; TWAROG, B. 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Computer modeling and simulation</topic><topic>PHOTOMETRY</topic><topic>RED GIANT STARS</topic><topic>SENSITIVITY</topic><topic>STARS</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>ANTHONY-TWAROG, B. J</creatorcontrib><creatorcontrib>LAIRD, J. B</creatorcontrib><creatorcontrib>PAYNE, D</creatorcontrib><creatorcontrib>TWAROG, B. A</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>OSTI.GOV</collection><jtitle>The Astronomical journal</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>ANTHONY-TWAROG, B. J</au><au>LAIRD, J. B</au><au>PAYNE, D</au><au>TWAROG, B. A</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Ca II H and K filter photometry on the uvby system. I, The standard system</atitle><jtitle>The Astronomical journal</jtitle><date>1991-05-01</date><risdate>1991</risdate><volume>101</volume><issue>5</issue><spage>1902</spage><epage>1914</epage><pages>1902-1914</pages><issn>0004-6256</issn><eissn>1538-3881</eissn><coden>ANJOAA</coden><abstract>A fifth filter (fwhm = 90 A) centered on Ca II H and K has been developed for use with the standard uvby system. The filter, called Ca, is designed primarily for applications to metal-poor dwarfs and red giants, regions where the uvby metallicity index, m(l), loses some sensitivity. An index, hk, is defined by replacing v in m(l) by Ca. The effects of interstellar extinction on the index are modeled and demonstrated to be modest and relatively insensitive to spectral type. Observations of V, (b-y), and hk for 163 primary standards are detailed and transformed to the standard V and (b-y) system. A qualitative analysis using only the primary standards indicates that hk is more sensitive than m(l) over the regions of interest by about a factor of 3. (Author)</abstract><cop>Chicago, IL</cop><pub>University of Chicago Press</pub><doi>10.1086/115815</doi><tpages>13</tpages></addata></record> |
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| ispartof | The Astronomical journal, 1991-05, Vol.101 (5), p.1902-1914 |
| issn | 0004-6256 1538-3881 |
| language | eng |
| recordid | cdi_osti_scitechconnect_5504273 |
| source | EZB-FREE-00999 freely available EZB journals; Alma/SFX Local Collection |
| subjects | 640102 - Astrophysics & Cosmology- Stars & Quasi-Stellar, Radio & X-Ray Sources ALKALINE EARTH METALS Astronomy CALCIUM CHEMICAL COMPOSITION CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS DWARF STARS Earth, ocean, space ELEMENTS Exact sciences and technology Fundamental astronomy and astrophysics. Instrumentation, techniques, and astronomical observations GIANT STARS MATHEMATICAL MODELS METALS Observation and data reduction techniques. Computer modeling and simulation PHOTOMETRY RED GIANT STARS SENSITIVITY STARS |
| title | Ca II H and K filter photometry on the uvby system. I, The standard system |
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