The Hubble Space Telescope key project on the extragalactic distance scale. XIV. The Cepheids in NGC 1365

N. A. Silbermann; Paul Harding; Laura Ferrarese; Peter B. Stetson; Barry F. Madore; Robert C. Kennicutt; Wendy L. Freedman; Jeremy R. Mould; Fabio Bresolin; Holland Ford; Brad K. Gibson; John A. Graham; Mingsheng Han; John G. Hoessel; Robert J. Hill; John Huchra; Shaun M.G. Hughes; Garth D. Illingworth; Dan Kelson; Lucas Macri; Randy Phelps; Daya Rawson; Shoko Sakai; Anne Turner

doi:10.1086/307002

The Hubble Space Telescope key project on the extragalactic distance scale. XIV. The Cepheids in NGC 1365

N. A. Silbermann^*, Paul Harding, Laura Ferrarese, Peter B. Stetson, Barry F. Madore, Robert C. Kennicutt, Wendy L. Freedman, Jeremy R. Mould, Fabio Bresolin, Holland Ford, Brad K. Gibson, John A. Graham, Mingsheng Han, John G. Hoessel, Robert J. Hill, John Huchra, Shaun M.G. Hughes, Garth D. Illingworth, Dan Kelson, Lucas MacriRandy Phelps, Daya Rawson, Shoko Sakai, Anne Turner

^*Corresponding author for this work

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

36 Citations (Scopus)

Abstract

We report the detection of Cepheid variable stars in the barred spiral galaxy NGC 1365, located in the Fornax cluster, using the Hubble Space Telescope (HST) Wide Field and Planetary Camera 2 (WFPC2). Twelve V (F555W) and four I (F814W) epochs of observation were obtained. The two photometry packages ALLFRAME and DoPHOT were separately used to obtain profile-fitting photometry of all the stars in the HST field. The search for Cepheid variable stars resulted in a sample of 52 variables, with periods between 14 and 60 days, common to both data sets. ALLFRAME photometry and light curves of the Cepheids are presented. A subset of 34 Cepheids were selected on the basis of period, light curve shape, similar ALLFRAME and DoPHOT periods, color, and relative crowding, to fit the Cepheid period-luminosity relations in V and I for both ALLFRAME and DoPHOT. The measured distance modulus to NGC 1365 from the ALLFRAME photometry is 31.31 ± 0.20 (random) ± 0.18 (systematic) mag, corresponding to a distance of 18.3 ± 1.7 (random) + 1.6 (systematic) Mpc. The reddening is measured to be E(V - I) = 0.16 ± 0.08 mag. These values are in excellent agreement with those obtained using the DoPHOT photometry, namely a distance modulus of 31.26 ± 0.10 mag and a reddening of 0.15 ± 0.10 mag (internal errors only).

Original language	English
Pages (from-to)	1-28
Number of pages	28
Journal	Astrophysical Journal
Volume	515
Issue number	1 PART 1
DOIs	https://doi.org/10.1086/307002
Publication status	Published - 10 Apr 1999

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Silbermann, N. A., Harding, P., Ferrarese, L., Stetson, P. B., Madore, B. F., Kennicutt, R. C., Freedman, W. L., Mould, J. R., Bresolin, F., Ford, H., Gibson, B. K., Graham, J. A., Han, M., Hoessel, J. G., Hill, R. J., Huchra, J., Hughes, S. M. G., Illingworth, G. D., Kelson, D., ... Turner, A. (1999). The Hubble Space Telescope key project on the extragalactic distance scale. XIV. The Cepheids in NGC 1365. Astrophysical Journal, 515(1 PART 1), 1-28. https://doi.org/10.1086/307002

@article{3501d2a9337b4d77a6045b25b79072d6,

title = "The Hubble Space Telescope key project on the extragalactic distance scale. XIV. The Cepheids in NGC 1365",

abstract = "We report the detection of Cepheid variable stars in the barred spiral galaxy NGC 1365, located in the Fornax cluster, using the Hubble Space Telescope (HST) Wide Field and Planetary Camera 2 (WFPC2). Twelve V (F555W) and four I (F814W) epochs of observation were obtained. The two photometry packages ALLFRAME and DoPHOT were separately used to obtain profile-fitting photometry of all the stars in the HST field. The search for Cepheid variable stars resulted in a sample of 52 variables, with periods between 14 and 60 days, common to both data sets. ALLFRAME photometry and light curves of the Cepheids are presented. A subset of 34 Cepheids were selected on the basis of period, light curve shape, similar ALLFRAME and DoPHOT periods, color, and relative crowding, to fit the Cepheid period-luminosity relations in V and I for both ALLFRAME and DoPHOT. The measured distance modulus to NGC 1365 from the ALLFRAME photometry is 31.31 ± 0.20 (random) ± 0.18 (systematic) mag, corresponding to a distance of 18.3 ± 1.7 (random) + 1.6 (systematic) Mpc. The reddening is measured to be E(V - I) = 0.16 ± 0.08 mag. These values are in excellent agreement with those obtained using the DoPHOT photometry, namely a distance modulus of 31.26 ± 0.10 mag and a reddening of 0.15 ± 0.10 mag (internal errors only).",

keywords = "Cepheids, Galaxies: distances and redshifts, Galaxies: individual (NGC 1365)",

author = "Silbermann, {N. A.} and Paul Harding and Laura Ferrarese and Stetson, {Peter B.} and Madore, {Barry F.} and Kennicutt, {Robert C.} and Freedman, {Wendy L.} and Mould, {Jeremy R.} and Fabio Bresolin and Holland Ford and Gibson, {Brad K.} and Graham, {John A.} and Mingsheng Han and Hoessel, {John G.} and Hill, {Robert J.} and John Huchra and Hughes, {Shaun M.G.} and Illingworth, {Garth D.} and Dan Kelson and Lucas Macri and Randy Phelps and Daya Rawson and Shoko Sakai and Anne Turner",

year = "1999",

month = apr,

day = "10",

doi = "10.1086/307002",

language = "English",

volume = "515",

pages = "1--28",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "American Astronomical Society",

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Silbermann, NA, Harding, P, Ferrarese, L, Stetson, PB, Madore, BF, Kennicutt, RC, Freedman, WL, Mould, JR, Bresolin, F, Ford, H, Gibson, BK, Graham, JA, Han, M, Hoessel, JG, Hill, RJ, Huchra, J, Hughes, SMG, Illingworth, GD, Kelson, D, Macri, L, Phelps, R, Rawson, D, Sakai, S & Turner, A 1999, 'The Hubble Space Telescope key project on the extragalactic distance scale. XIV. The Cepheids in NGC 1365', Astrophysical Journal, vol. 515, no. 1 PART 1, pp. 1-28. https://doi.org/10.1086/307002

TY - JOUR

T1 - The Hubble Space Telescope key project on the extragalactic distance scale. XIV. The Cepheids in NGC 1365

AU - Silbermann, N. A.

AU - Harding, Paul

AU - Ferrarese, Laura

AU - Stetson, Peter B.

AU - Madore, Barry F.

AU - Kennicutt, Robert C.

AU - Freedman, Wendy L.

AU - Mould, Jeremy R.

AU - Bresolin, Fabio

AU - Ford, Holland

AU - Gibson, Brad K.

AU - Graham, John A.

AU - Han, Mingsheng

AU - Hoessel, John G.

AU - Hill, Robert J.

AU - Huchra, John

AU - Hughes, Shaun M.G.

AU - Illingworth, Garth D.

AU - Kelson, Dan

AU - Macri, Lucas

AU - Phelps, Randy

AU - Rawson, Daya

AU - Sakai, Shoko

AU - Turner, Anne

PY - 1999/4/10

Y1 - 1999/4/10

N2 - We report the detection of Cepheid variable stars in the barred spiral galaxy NGC 1365, located in the Fornax cluster, using the Hubble Space Telescope (HST) Wide Field and Planetary Camera 2 (WFPC2). Twelve V (F555W) and four I (F814W) epochs of observation were obtained. The two photometry packages ALLFRAME and DoPHOT were separately used to obtain profile-fitting photometry of all the stars in the HST field. The search for Cepheid variable stars resulted in a sample of 52 variables, with periods between 14 and 60 days, common to both data sets. ALLFRAME photometry and light curves of the Cepheids are presented. A subset of 34 Cepheids were selected on the basis of period, light curve shape, similar ALLFRAME and DoPHOT periods, color, and relative crowding, to fit the Cepheid period-luminosity relations in V and I for both ALLFRAME and DoPHOT. The measured distance modulus to NGC 1365 from the ALLFRAME photometry is 31.31 ± 0.20 (random) ± 0.18 (systematic) mag, corresponding to a distance of 18.3 ± 1.7 (random) + 1.6 (systematic) Mpc. The reddening is measured to be E(V - I) = 0.16 ± 0.08 mag. These values are in excellent agreement with those obtained using the DoPHOT photometry, namely a distance modulus of 31.26 ± 0.10 mag and a reddening of 0.15 ± 0.10 mag (internal errors only).

AB - We report the detection of Cepheid variable stars in the barred spiral galaxy NGC 1365, located in the Fornax cluster, using the Hubble Space Telescope (HST) Wide Field and Planetary Camera 2 (WFPC2). Twelve V (F555W) and four I (F814W) epochs of observation were obtained. The two photometry packages ALLFRAME and DoPHOT were separately used to obtain profile-fitting photometry of all the stars in the HST field. The search for Cepheid variable stars resulted in a sample of 52 variables, with periods between 14 and 60 days, common to both data sets. ALLFRAME photometry and light curves of the Cepheids are presented. A subset of 34 Cepheids were selected on the basis of period, light curve shape, similar ALLFRAME and DoPHOT periods, color, and relative crowding, to fit the Cepheid period-luminosity relations in V and I for both ALLFRAME and DoPHOT. The measured distance modulus to NGC 1365 from the ALLFRAME photometry is 31.31 ± 0.20 (random) ± 0.18 (systematic) mag, corresponding to a distance of 18.3 ± 1.7 (random) + 1.6 (systematic) Mpc. The reddening is measured to be E(V - I) = 0.16 ± 0.08 mag. These values are in excellent agreement with those obtained using the DoPHOT photometry, namely a distance modulus of 31.26 ± 0.10 mag and a reddening of 0.15 ± 0.10 mag (internal errors only).

KW - Cepheids

KW - Galaxies: distances and redshifts

KW - Galaxies: individual (NGC 1365)

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U2 - 10.1086/307002

DO - 10.1086/307002

M3 - Article

SN - 0004-637X

VL - 515

SP - 1

EP - 28

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1 PART 1

ER -

The Hubble Space Telescope key project on the extragalactic distance scale. XIV. The Cepheids in NGC 1365

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