NICMOS observations of extragalactic Cepheids. I. Photometry database and a test of the standard extinction law

L. M. Macri; D. Calzetti; W. L. Freedman; B. K. Glbson; J. A. Graham; J. P. Huchra; S. M.G. Hughes; B. F. Madore; J. R. Mould; S. E. Persson; P. B. Stetson

doi:10.1086/319465

NICMOS observations of extragalactic Cepheids. I. Photometry database and a test of the standard extinction law

L. M. Macri^*, D. Calzetti, W. L. Freedman, B. K. Glbson, J. A. Graham, J. P. Huchra, S. M.G. Hughes, B. F. Madore, J. R. Mould, S. E. Persson, P. B. Stetson

^*Corresponding author for this work

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

71 Citations (Scopus)

Abstract

We present the results of near-infrared observations of extragalactic Cepheids made with the Near-Infrared Camera and Multi-Object Spectrometer on board the Hubble Space Telescope (HST). The variables are located in the galaxies IC 1613, IC 4182, M31, M81, M101, NGC 925, NGC 1365, NGC 2090, NGC 3198, NGC 3621, NGC 4496A, and NGC 4536. All fields were observed in the F160W bandpass; additional images were obtained in the F110W and F205W filters. Photometry was performed using the DAOPHOT II/ALLSTAR package. Self-consistent distance moduli and color excesses were obtained by fitting period-luminosity relations in the H, I, and V bands. Our results support the assumption of a standard reddening law adopted by the HST Key Project on the Extragalactic Distance Scale. A companion paper will determine true distance moduli and explore the effects of metallicity on the Cepheid distance scale.

Original language	English
Pages (from-to)	721-744
Number of pages	24
Journal	Astrophysical Journal
Volume	549
Issue number	2 PART 1
DOIs	https://doi.org/10.1086/319465
Publication status	Published - 10 Mar 2001

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@article{8f1e5468126740f9804ddd206d25ebba,

title = "NICMOS observations of extragalactic Cepheids. I. Photometry database and a test of the standard extinction law",

abstract = "We present the results of near-infrared observations of extragalactic Cepheids made with the Near-Infrared Camera and Multi-Object Spectrometer on board the Hubble Space Telescope (HST). The variables are located in the galaxies IC 1613, IC 4182, M31, M81, M101, NGC 925, NGC 1365, NGC 2090, NGC 3198, NGC 3621, NGC 4496A, and NGC 4536. All fields were observed in the F160W bandpass; additional images were obtained in the F110W and F205W filters. Photometry was performed using the DAOPHOT II/ALLSTAR package. Self-consistent distance moduli and color excesses were obtained by fitting period-luminosity relations in the H, I, and V bands. Our results support the assumption of a standard reddening law adopted by the HST Key Project on the Extragalactic Distance Scale. A companion paper will determine true distance moduli and explore the effects of metallicity on the Cepheid distance scale.",

keywords = "Cepheids, Distance scale, Galaxies: stellar content",

author = "Macri, {L. M.} and D. Calzetti and Freedman, {W. L.} and Glbson, {B. K.} and Graham, {J. A.} and Huchra, {J. P.} and Hughes, {S. M.G.} and Madore, {B. F.} and Mould, {J. R.} and Persson, {S. E.} and Stetson, {P. B.}",

year = "2001",

month = mar,

day = "10",

doi = "10.1086/319465",

language = "English",

volume = "549",

pages = "721--744",

journal = "Astrophysical Journal",

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publisher = "American Astronomical Society",

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TY - JOUR

T1 - NICMOS observations of extragalactic Cepheids. I. Photometry database and a test of the standard extinction law

AU - Macri, L. M.

AU - Calzetti, D.

AU - Freedman, W. L.

AU - Glbson, B. K.

AU - Graham, J. A.

AU - Huchra, J. P.

AU - Hughes, S. M.G.

AU - Madore, B. F.

AU - Mould, J. R.

AU - Persson, S. E.

AU - Stetson, P. B.

PY - 2001/3/10

Y1 - 2001/3/10

N2 - We present the results of near-infrared observations of extragalactic Cepheids made with the Near-Infrared Camera and Multi-Object Spectrometer on board the Hubble Space Telescope (HST). The variables are located in the galaxies IC 1613, IC 4182, M31, M81, M101, NGC 925, NGC 1365, NGC 2090, NGC 3198, NGC 3621, NGC 4496A, and NGC 4536. All fields were observed in the F160W bandpass; additional images were obtained in the F110W and F205W filters. Photometry was performed using the DAOPHOT II/ALLSTAR package. Self-consistent distance moduli and color excesses were obtained by fitting period-luminosity relations in the H, I, and V bands. Our results support the assumption of a standard reddening law adopted by the HST Key Project on the Extragalactic Distance Scale. A companion paper will determine true distance moduli and explore the effects of metallicity on the Cepheid distance scale.

AB - We present the results of near-infrared observations of extragalactic Cepheids made with the Near-Infrared Camera and Multi-Object Spectrometer on board the Hubble Space Telescope (HST). The variables are located in the galaxies IC 1613, IC 4182, M31, M81, M101, NGC 925, NGC 1365, NGC 2090, NGC 3198, NGC 3621, NGC 4496A, and NGC 4536. All fields were observed in the F160W bandpass; additional images were obtained in the F110W and F205W filters. Photometry was performed using the DAOPHOT II/ALLSTAR package. Self-consistent distance moduli and color excesses were obtained by fitting period-luminosity relations in the H, I, and V bands. Our results support the assumption of a standard reddening law adopted by the HST Key Project on the Extragalactic Distance Scale. A companion paper will determine true distance moduli and explore the effects of metallicity on the Cepheid distance scale.

KW - Cepheids

KW - Distance scale

KW - Galaxies: stellar content

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U2 - 10.1086/319465

DO - 10.1086/319465

M3 - Article

SN - 0004-637X

VL - 549

SP - 721

EP - 744

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 2 PART 1

ER -

NICMOS observations of extragalactic Cepheids. I. Photometry database and a test of the standard extinction law

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