ON THE DISTANCE OF THE GLOBULAR CLUSTER M4 (NGC 6121) USING RR LYRAE STARS. II. MID-INFRARED PERIOD–LUMINOSITY RELATIONS

J. R. Neeley, M. Marengo, G. Bono, V. F. Braga, M. Dall’Ora, P. B. Stetson, R. Buonanno, I. Ferraro, W. L. Freedman, G. Iannicola, B. F. Madore, N. Matsunaga, A. Monson, S. E. Persson, V. Scowcroft, M. Seibert

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Abstract

New mid-infrared (MIR) period–luminosity (PL) relations are presented for RR Lyræ variables in the globular cluster M4 (NGC 6121). Accurate photometry was obtained for 37 RR Lyræ variables using observations from the Infrared Array Camera on board the Spitzer Space Telescope. The dispersion of M4's PL relations is 0.056, and the uncertainty in the slope is 0.11 mag. Additionally, we established calibrated PL relations at 3.6 and 4.5 μm using published Hubble Space Telescope geometric parallaxes of five Galactic RR Lyræ stars. The resulting band-averaged distance modulus for M4 is $\mu =11.399\pm 0.007(\mathrm{stat})$ ± $0.080(\mathrm{syst})$ ± $0.015(\mathrm{cal})\pm 0.020(\mathrm{ext})$. The systematic uncertainty will be greatly reduced when parallaxes of more stars become available from the GAIA mission. Optical and infrared period–color (PC) relations are also presented, and the lack of an MIR PC relation suggests that RR Lyræ stars are not affected by CO absorption in the 4.5 μm band.
Original languageEnglish
Pages (from-to)11
JournalAstrophysical Journal
Volume808
Issue number1
DOIs
Publication statusPublished - 14 Jul 2015

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globular clusters
luminosity
stars
color
Space Infrared Telescope Facility
Hubble Space Telescope
photometry
cameras
slopes

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Neeley, J. R., Marengo, M., Bono, G., Braga, V. F., Dall’Ora, M., Stetson, P. B., ... Seibert, M. (2015). ON THE DISTANCE OF THE GLOBULAR CLUSTER M4 (NGC 6121) USING RR LYRAE STARS. II. MID-INFRARED PERIOD–LUMINOSITY RELATIONS. Astrophysical Journal, 808(1), 11. https://doi.org/10.1088/0004-637X/808/1/11

ON THE DISTANCE OF THE GLOBULAR CLUSTER M4 (NGC 6121) USING RR LYRAE STARS. II. MID-INFRARED PERIOD–LUMINOSITY RELATIONS. / Neeley, J. R.; Marengo, M.; Bono, G.; Braga, V. F.; Dall’Ora, M.; Stetson, P. B.; Buonanno, R.; Ferraro, I.; Freedman, W. L.; Iannicola, G.; Madore, B. F.; Matsunaga, N.; Monson, A.; Persson, S. E.; Scowcroft, V.; Seibert, M.

In: Astrophysical Journal, Vol. 808, No. 1, 14.07.2015, p. 11.

Research output: Contribution to journalArticle

Neeley, JR, Marengo, M, Bono, G, Braga, VF, Dall’Ora, M, Stetson, PB, Buonanno, R, Ferraro, I, Freedman, WL, Iannicola, G, Madore, BF, Matsunaga, N, Monson, A, Persson, SE, Scowcroft, V & Seibert, M 2015, 'ON THE DISTANCE OF THE GLOBULAR CLUSTER M4 (NGC 6121) USING RR LYRAE STARS. II. MID-INFRARED PERIOD–LUMINOSITY RELATIONS', Astrophysical Journal, vol. 808, no. 1, pp. 11. https://doi.org/10.1088/0004-637X/808/1/11
Neeley, J. R. ; Marengo, M. ; Bono, G. ; Braga, V. F. ; Dall’Ora, M. ; Stetson, P. B. ; Buonanno, R. ; Ferraro, I. ; Freedman, W. L. ; Iannicola, G. ; Madore, B. F. ; Matsunaga, N. ; Monson, A. ; Persson, S. E. ; Scowcroft, V. ; Seibert, M. / ON THE DISTANCE OF THE GLOBULAR CLUSTER M4 (NGC 6121) USING RR LYRAE STARS. II. MID-INFRARED PERIOD–LUMINOSITY RELATIONS. In: Astrophysical Journal. 2015 ; Vol. 808, No. 1. pp. 11.
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title = "ON THE DISTANCE OF THE GLOBULAR CLUSTER M4 (NGC 6121) USING RR LYRAE STARS. II. MID-INFRARED PERIOD–LUMINOSITY RELATIONS",
abstract = "New mid-infrared (MIR) period–luminosity (PL) relations are presented for RR Lyr{\ae} variables in the globular cluster M4 (NGC 6121). Accurate photometry was obtained for 37 RR Lyr{\ae} variables using observations from the Infrared Array Camera on board the Spitzer Space Telescope. The dispersion of M4's PL relations is 0.056, and the uncertainty in the slope is 0.11 mag. Additionally, we established calibrated PL relations at 3.6 and 4.5 μm using published Hubble Space Telescope geometric parallaxes of five Galactic RR Lyr{\ae} stars. The resulting band-averaged distance modulus for M4 is $\mu =11.399\pm 0.007(\mathrm{stat})$ ± $0.080(\mathrm{syst})$ ± $0.015(\mathrm{cal})\pm 0.020(\mathrm{ext})$. The systematic uncertainty will be greatly reduced when parallaxes of more stars become available from the GAIA mission. Optical and infrared period–color (PC) relations are also presented, and the lack of an MIR PC relation suggests that RR Lyr{\ae} stars are not affected by CO absorption in the 4.5 μm band.",
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AU - Neeley, J. R.

AU - Marengo, M.

AU - Bono, G.

AU - Braga, V. F.

AU - Dall’Ora, M.

AU - Stetson, P. B.

AU - Buonanno, R.

AU - Ferraro, I.

AU - Freedman, W. L.

AU - Iannicola, G.

AU - Madore, B. F.

AU - Matsunaga, N.

AU - Monson, A.

AU - Persson, S. E.

AU - Scowcroft, V.

AU - Seibert, M.

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N2 - New mid-infrared (MIR) period–luminosity (PL) relations are presented for RR Lyræ variables in the globular cluster M4 (NGC 6121). Accurate photometry was obtained for 37 RR Lyræ variables using observations from the Infrared Array Camera on board the Spitzer Space Telescope. The dispersion of M4's PL relations is 0.056, and the uncertainty in the slope is 0.11 mag. Additionally, we established calibrated PL relations at 3.6 and 4.5 μm using published Hubble Space Telescope geometric parallaxes of five Galactic RR Lyræ stars. The resulting band-averaged distance modulus for M4 is $\mu =11.399\pm 0.007(\mathrm{stat})$ ± $0.080(\mathrm{syst})$ ± $0.015(\mathrm{cal})\pm 0.020(\mathrm{ext})$. The systematic uncertainty will be greatly reduced when parallaxes of more stars become available from the GAIA mission. Optical and infrared period–color (PC) relations are also presented, and the lack of an MIR PC relation suggests that RR Lyræ stars are not affected by CO absorption in the 4.5 μm band.

AB - New mid-infrared (MIR) period–luminosity (PL) relations are presented for RR Lyræ variables in the globular cluster M4 (NGC 6121). Accurate photometry was obtained for 37 RR Lyræ variables using observations from the Infrared Array Camera on board the Spitzer Space Telescope. The dispersion of M4's PL relations is 0.056, and the uncertainty in the slope is 0.11 mag. Additionally, we established calibrated PL relations at 3.6 and 4.5 μm using published Hubble Space Telescope geometric parallaxes of five Galactic RR Lyræ stars. The resulting band-averaged distance modulus for M4 is $\mu =11.399\pm 0.007(\mathrm{stat})$ ± $0.080(\mathrm{syst})$ ± $0.015(\mathrm{cal})\pm 0.020(\mathrm{ext})$. The systematic uncertainty will be greatly reduced when parallaxes of more stars become available from the GAIA mission. Optical and infrared period–color (PC) relations are also presented, and the lack of an MIR PC relation suggests that RR Lyræ stars are not affected by CO absorption in the 4.5 μm band.

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