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6 results on '"M71"'

3. BV CCD Photometry of M71: Distance and Age

Author

Hong-Suh Yim, Mun-Suk Chun, Yong-Ik Byun, and Young-Jong Sohn

Subjects
globular cluster, M71, CCD photometry, color-magnitude diagram, distance, relative age, Astronomy, QB1-991
Abstract

We present BV CCD photometry of metal-rich globular cluster M71. Based on our color-magnitude diagram (CMD), we derive the distance to M71 using a sample of Hipparcos subdwarfs of similar metallicity. Our distance modulus is (m-M)V=13.46(± 0.17). CMD comparison was also made between M71 and 47 Tuc. We confirm that there exists a significant age difference(> 2 billion years) in spite of their similarity in metallicity.

Published
2004
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4. BV CCD PHOTOMETRY OF M71: DISTANCE AND AGE

Author

Young-Jong Sohn, Yong-Ik Byun, Hong-Suh Yim, and Mun-Suk Chun

Subjects
relative age, lcsh:QB1-991, Physics, Photometry (astronomy), lcsh:Astronomy, Globular cluster, globular cluster, M71, CCD photometry, Astrophysics, distance, color-magnitude diagram
Abstract

We present BV CCD photometry of metal-rich globular cluster M71. Based on our color-magnitude diagram (CMD), we derive the distance to M71 using a sample of Hipparcos subdwarfs of similar metallicity. Our distance modulus is (m-M)V=13.46(± 0.17). CMD comparison was also made between M71 and 47 Tuc. We confirm that there exists a significant age difference(> 2 billion years) in spite of their similarity in metallicity.

Published
2004
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5. Chile receives ex-South African towed howitzers

Author

Foss, Christopher F.

Subjects
Aerospace and defense industries, Business, 155mm G4, M71
Abstract

Chile has purchased 24 155mm G4 towed coastal defence artillery systems from Armscor of South Africa for R16.3 million, or $2.5 million. The systems, which are Soltam 155mm/39-calibre M71s, were first acquired by South Africa from Israeli's Soltam company. Chile plans to use the newly acquired weapons, which fire a standard high-explosive projectile to a maximum range of 23.5 km or a base-bleed projectile to 30 km, in protecting its long coastline. Chile is also acquiring the Excalibur surface-to-surface coastal-defence missile system from the UK.

Published
1998

6. Strömgren Photometry of Galactic Globular Clusters. I. New Calibrations of the Metallicity Index

Author

P. B. Stetson, Tom Richtler, R. Buonanno, G. Iannicola, L. M. Freyhammer, Annalisa Calamida, L. Pulone, Frank Grundahl, Marco Castellani, Filippina Caputo, C. E. Corsi, Giuseppe Bono, Adriano Pietrinferni, Francesca Primas, Michael Hilker, Martino Romaniello, I. Ferraro, and S. Cassisi

Subjects
NGC 6397, Red giant, Metallicity, NGC 6752, Globular clusters: general, FOS: Physical sciences, Astrophysics, NGC 288, Stars: abundances stars: evolution, Globular clusters: individual (M13, M71, M92, NGC 288, NGC 362, NGC 1851, NGC 6397, NGC 6752, 47 Tucanae), NGC 362, Photometry (optics), Settore FIS/05 - Astronomia e Astrofisica, NGC 1851, Calibration, M92, M71, Physics, Astrophysics (astro-ph), Sigma, Astronomy and Astrophysics, Effective temperature, Stars, Space and Planetary Science, Globular cluster, Globular clusters: individual (M13, 47 Tucanae)
Abstract

We present a new calibration of the Stroemgren metallicity index m1 using red giant (RG) stars in 4 globular clusters (GCs:M92,M13,NGC1851,47Tuc) with metallicity ranging from [Fe/H]=-2.2 to -0.7, marginally affected by reddening (E(B-V), 51 pages, 19 figures, accepted for submission to ApJ

Published
2007
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