The cepheid period-luminosity relation (the leavitt law) at mid-infrared wavelengths. II. Second-epoch LMC data

Barry F. Madore; Wendy L. Freedman; Jane Rigby; S. E. Persson; Laura Sturch; Violet Mager

doi:10.1088/0004-637X/695/2/988

The cepheid period-luminosity relation (the leavitt law) at mid-infrared wavelengths. II. Second-epoch LMC data

Barry F. Madore, Wendy L. Freedman, Jane Rigby, S. E. Persson, Laura Sturch, Violet Mager

Penn State Wilkes-Barre

Research output: Contribution to journal › Article › peer-review

25 Scopus citations

Abstract

We present revised and improved mid-infrared (mid-IR) period-luminosity (PL) relations for Large Magellanic Cloud (LMC) Cepheids based on double-epoch data of 70 Cepheids observed by Spitzer at 3.6, 4.5, 5.8, and 8.0μm. The observed scatter at all wavelengths is found to decrease from ±0.17 mag to ±0.14 mag, which is fully consistent with the prediction that the total scatter is made up of roughly equal contributions from random sampling of the light curve and nearly uniform samplings of stars across the instability strip. It is calculated that the Cepheids in this sample have a full amplitude of about 0.4 mag and that their fully sampled, time-averaged magnitudes should eventually reveal mid-IR PL relations that each have intrinsic scatter at most at the ±0.12 mag level, and as low as ± 0.08 mag after correcting for the tilt of the LMC.

Original language	English (US)
Pages (from-to)	988-995
Number of pages	8
Journal	Astrophysical Journal
Volume	695
Issue number	2
DOIs	https://doi.org/10.1088/0004-637X/695/2/988
State	Published - Apr 20 2009

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

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title = "The cepheid period-luminosity relation (the leavitt law) at mid-infrared wavelengths. II. Second-epoch LMC data",

abstract = "We present revised and improved mid-infrared (mid-IR) period-luminosity (PL) relations for Large Magellanic Cloud (LMC) Cepheids based on double-epoch data of 70 Cepheids observed by Spitzer at 3.6, 4.5, 5.8, and 8.0μm. The observed scatter at all wavelengths is found to decrease from ±0.17 mag to ±0.14 mag, which is fully consistent with the prediction that the total scatter is made up of roughly equal contributions from random sampling of the light curve and nearly uniform samplings of stars across the instability strip. It is calculated that the Cepheids in this sample have a full amplitude of about 0.4 mag and that their fully sampled, time-averaged magnitudes should eventually reveal mid-IR PL relations that each have intrinsic scatter at most at the ±0.12 mag level, and as low as ± 0.08 mag after correcting for the tilt of the LMC.",

author = "Madore, {Barry F.} and Freedman, {Wendy L.} and Jane Rigby and Persson, {S. E.} and Laura Sturch and Violet Mager",

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T1 - The cepheid period-luminosity relation (the leavitt law) at mid-infrared wavelengths. II. Second-epoch LMC data

AU - Madore, Barry F.

AU - Freedman, Wendy L.

AU - Rigby, Jane

AU - Persson, S. E.

AU - Sturch, Laura

AU - Mager, Violet

PY - 2009/4/20

Y1 - 2009/4/20

N2 - We present revised and improved mid-infrared (mid-IR) period-luminosity (PL) relations for Large Magellanic Cloud (LMC) Cepheids based on double-epoch data of 70 Cepheids observed by Spitzer at 3.6, 4.5, 5.8, and 8.0μm. The observed scatter at all wavelengths is found to decrease from ±0.17 mag to ±0.14 mag, which is fully consistent with the prediction that the total scatter is made up of roughly equal contributions from random sampling of the light curve and nearly uniform samplings of stars across the instability strip. It is calculated that the Cepheids in this sample have a full amplitude of about 0.4 mag and that their fully sampled, time-averaged magnitudes should eventually reveal mid-IR PL relations that each have intrinsic scatter at most at the ±0.12 mag level, and as low as ± 0.08 mag after correcting for the tilt of the LMC.

AB - We present revised and improved mid-infrared (mid-IR) period-luminosity (PL) relations for Large Magellanic Cloud (LMC) Cepheids based on double-epoch data of 70 Cepheids observed by Spitzer at 3.6, 4.5, 5.8, and 8.0μm. The observed scatter at all wavelengths is found to decrease from ±0.17 mag to ±0.14 mag, which is fully consistent with the prediction that the total scatter is made up of roughly equal contributions from random sampling of the light curve and nearly uniform samplings of stars across the instability strip. It is calculated that the Cepheids in this sample have a full amplitude of about 0.4 mag and that their fully sampled, time-averaged magnitudes should eventually reveal mid-IR PL relations that each have intrinsic scatter at most at the ±0.12 mag level, and as low as ± 0.08 mag after correcting for the tilt of the LMC.

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