LARGE MAGELLANIC CLOUD NEAR-INFRARED SYNOPTIC SURVEY. I. CEPHEID VARIABLES AND THE CALIBRATION OF THE LEAVITT LAW
We present observational details and first results of a near-infrared (JHKs) synoptic survey of the central region of the Large Magellanic Cloud (LMC) using the CPAPIR camera at the CTIO 1.5 m telescope. We covered 18 square degrees to a depth of K sub(s)~16.5 mag and obtained an average of 16 epoch...
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| Veröffentlicht in: | The Astronomical journal 2015-04, Vol.149 (4), p.1-17 |
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| container_title | The Astronomical journal |
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| creator | Macri, Lucas M Ngeow, Chow-Choong Kanbur, Shashi M Mahzooni, Salma Smitka, Michael T |
| description | We present observational details and first results of a near-infrared (JHKs) synoptic survey of the central region of the Large Magellanic Cloud (LMC) using the CPAPIR camera at the CTIO 1.5 m telescope. We covered 18 square degrees to a depth of K sub(s)~16.5 mag and obtained an average of 16 epochs in each band at any given location. Our catalog contains more than 3.5 x 10 super(6) sources, including 1417 Cepheid variables previously studied at optical wavelengths by the OGLE survey. Our sample of fundamental-mode pulsators represents a nine-fold increase in the number of these variables with time-resolved, multi-band near-infrared photometry. We combine our large Cepheid sample and a recent precise determination of the distance to the LMC to derive a robust absolute calibration of the near-infrared Leavitt Law for fundamental-mode and first-overtone Cepheids with 10x better constraints on the slopes relative to previous work. We also obtain calibrations for the tip of the red giant branch and the red clump based on our ensemble photometry which are in good agreement with previous determinations. |
| doi_str_mv | 10.1088/0004-6256/149/4/117 |
| format | Article |
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We combine our large Cepheid sample and a recent precise determination of the distance to the LMC to derive a robust absolute calibration of the near-infrared Leavitt Law for fundamental-mode and first-overtone Cepheids with 10x better constraints on the slopes relative to previous work. 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CEPHEID VARIABLES AND THE CALIBRATION OF THE LEAVITT LAW</title><author>Macri, Lucas M ; Ngeow, Chow-Choong ; Kanbur, Shashi M ; Mahzooni, Salma ; Smitka, Michael T</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c409t-ce3ff4a76c55c2bcfc55a8d527de713daf976237f368a6fc1f5a8056f9389eb83</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2015</creationdate><topic>ASTROPHYSICS, COSMOLOGY AND ASTRONOMY</topic><topic>CALIBRATION</topic><topic>CAMERAS</topic><topic>Cepheid variables</topic><topic>CEPHEIDS</topic><topic>Clumps</topic><topic>INFRARED SURVEYS</topic><topic>LIMITING VALUES</topic><topic>MAGELLANIC CLOUDS</topic><topic>NEAR INFRARED RADIATION</topic><topic>PHOTOMETRY</topic><topic>Slopes</topic><topic>TELESCOPES</topic><topic>TIME RESOLUTION</topic><topic>WAVELENGTHS</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Macri, Lucas M</creatorcontrib><creatorcontrib>Ngeow, Chow-Choong</creatorcontrib><creatorcontrib>Kanbur, Shashi M</creatorcontrib><creatorcontrib>Mahzooni, Salma</creatorcontrib><creatorcontrib>Smitka, Michael T</creatorcontrib><collection>CrossRef</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Meteorological & Geoastrophysical Abstracts - Academic</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>Macri, Lucas M</au><au>Ngeow, Chow-Choong</au><au>Kanbur, Shashi M</au><au>Mahzooni, Salma</au><au>Smitka, Michael T</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>LARGE MAGELLANIC CLOUD NEAR-INFRARED SYNOPTIC SURVEY. I. CEPHEID VARIABLES AND THE CALIBRATION OF THE LEAVITT LAW</atitle><jtitle>The Astronomical journal</jtitle><date>2015-04-01</date><risdate>2015</risdate><volume>149</volume><issue>4</issue><spage>1</spage><epage>17</epage><pages>1-17</pages><issn>1538-3881</issn><issn>0004-6256</issn><eissn>1538-3881</eissn><abstract>We present observational details and first results of a near-infrared (JHKs) synoptic survey of the central region of the Large Magellanic Cloud (LMC) using the CPAPIR camera at the CTIO 1.5 m telescope. We covered 18 square degrees to a depth of K sub(s)~16.5 mag and obtained an average of 16 epochs in each band at any given location. Our catalog contains more than 3.5 x 10 super(6) sources, including 1417 Cepheid variables previously studied at optical wavelengths by the OGLE survey. Our sample of fundamental-mode pulsators represents a nine-fold increase in the number of these variables with time-resolved, multi-band near-infrared photometry. We combine our large Cepheid sample and a recent precise determination of the distance to the LMC to derive a robust absolute calibration of the near-infrared Leavitt Law for fundamental-mode and first-overtone Cepheids with 10x better constraints on the slopes relative to previous work. We also obtain calibrations for the tip of the red giant branch and the red clump based on our ensemble photometry which are in good agreement with previous determinations.</abstract><cop>United States</cop><doi>10.1088/0004-6256/149/4/117</doi><tpages>17</tpages><orcidid>https://orcid.org/0000-0001-8771-7554</orcidid></addata></record> |
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| source | IOP Publishing Free Content; EZB-FREE-00999 freely available EZB journals; IOPscience extra; Alma/SFX Local Collection |
| subjects | ASTROPHYSICS, COSMOLOGY AND ASTRONOMY CALIBRATION CAMERAS Cepheid variables CEPHEIDS Clumps INFRARED SURVEYS LIMITING VALUES MAGELLANIC CLOUDS NEAR INFRARED RADIATION PHOTOMETRY Slopes TELESCOPES TIME RESOLUTION WAVELENGTHS |
| title | LARGE MAGELLANIC CLOUD NEAR-INFRARED SYNOPTIC SURVEY. I. CEPHEID VARIABLES AND THE CALIBRATION OF THE LEAVITT LAW |
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