Period-luminosity relations for Galactic Cepheid variables with independent distance measurements

Chow Choong Ngeow; Shashi M. Kanbur

doi:10.1111/j.1365-2966.2004.07595.x

Period-luminosity relations for Galactic Cepheid variables with independent distance measurements

Chow Choong Ngeow, Shashi M. Kanbur

Graduate Institute of Astronomy

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27 Scopus citations

Abstract

In this paper, we derive the period-luminosity (PL) relation for Galactic Cepheids with recent independent distance measurements from open cluster, Barnes-Evans surface brightness, interferometry and Hubble Space Telescope astrometry techniques. Our PL relation confirms the results from recent works, which showed that the Galactic Cepheids follow a different PL relation to their Large Magellanic Cloud (LMC) counterparts. Our results also show that the slope of the Galactic PL relation is inconsistent with the LMC slope with more than 95 per cent confidence level. We apply this Galactic PL relation to find the distance to NGC 4258. Our result of μ_o = 29.49 ± 0.06 mag (random error) agrees at the ∼1.4σ level with the geometrical distance of μ_geo = 29.28 × 0.15 mag from water maser measurements.

Original language	English
Pages (from-to)	1130-1136
Number of pages	7
Journal	Monthly Notices of the Royal Astronomical Society
Volume	349
Issue number	3
DOIs	https://doi.org/10.1111/j.1365-2966.2004.07595.x
State	Published - 11 Apr 2004

Keywords

Cepheids
Stars: fundamental parameters

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10.1111/j.1365-2966.2004.07595.x

Cite this

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title = "Period-luminosity relations for Galactic Cepheid variables with independent distance measurements",

abstract = "In this paper, we derive the period-luminosity (PL) relation for Galactic Cepheids with recent independent distance measurements from open cluster, Barnes-Evans surface brightness, interferometry and Hubble Space Telescope astrometry techniques. Our PL relation confirms the results from recent works, which showed that the Galactic Cepheids follow a different PL relation to their Large Magellanic Cloud (LMC) counterparts. Our results also show that the slope of the Galactic PL relation is inconsistent with the LMC slope with more than 95 per cent confidence level. We apply this Galactic PL relation to find the distance to NGC 4258. Our result of μo = 29.49 ± 0.06 mag (random error) agrees at the ∼1.4σ level with the geometrical distance of μgeo = 29.28 × 0.15 mag from water maser measurements.",

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T1 - Period-luminosity relations for Galactic Cepheid variables with independent distance measurements

AU - Ngeow, Chow Choong

AU - Kanbur, Shashi M.

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N2 - In this paper, we derive the period-luminosity (PL) relation for Galactic Cepheids with recent independent distance measurements from open cluster, Barnes-Evans surface brightness, interferometry and Hubble Space Telescope astrometry techniques. Our PL relation confirms the results from recent works, which showed that the Galactic Cepheids follow a different PL relation to their Large Magellanic Cloud (LMC) counterparts. Our results also show that the slope of the Galactic PL relation is inconsistent with the LMC slope with more than 95 per cent confidence level. We apply this Galactic PL relation to find the distance to NGC 4258. Our result of μo = 29.49 ± 0.06 mag (random error) agrees at the ∼1.4σ level with the geometrical distance of μgeo = 29.28 × 0.15 mag from water maser measurements.

AB - In this paper, we derive the period-luminosity (PL) relation for Galactic Cepheids with recent independent distance measurements from open cluster, Barnes-Evans surface brightness, interferometry and Hubble Space Telescope astrometry techniques. Our PL relation confirms the results from recent works, which showed that the Galactic Cepheids follow a different PL relation to their Large Magellanic Cloud (LMC) counterparts. Our results also show that the slope of the Galactic PL relation is inconsistent with the LMC slope with more than 95 per cent confidence level. We apply this Galactic PL relation to find the distance to NGC 4258. Our result of μo = 29.49 ± 0.06 mag (random error) agrees at the ∼1.4σ level with the geometrical distance of μgeo = 29.28 × 0.15 mag from water maser measurements.

KW - Cepheids

KW - Stars: fundamental parameters

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DO - 10.1111/j.1365-2966.2004.07595.x

M3 - 期刊論文

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Period-luminosity relations for Galactic Cepheid variables with independent distance measurements

Abstract

Keywords

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