The Impact of the Internet on Learners and Schools

Peterson, Nils S.; Facemyer, Kevin C.

doi:10.1177/019263659608058209

Cited by 7 publications

(2 citation statements)

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“…Confirmation that the mass of metal poor RR Lyraes is larger than that for metal rich variables is available from analyses of the observations of double mode variables via the Peterson (1973) diagram and the subsequent calculations by Peterson (1978Peterson ( , 1979, Cox et al (1980), Cox et al (1983), and Cox (1987) and references therein. The calculations by Kovacs et al (1992) that show the sensitivity of the results to various chemical composition mixtures are illustrated in Fig.…”

Section: The Dependence Of Rr Lyrae Mass On Metallicitymentioning

confidence: 95%

On the Predicted and Observed Color Boundaries of the RR Lyrae Instability Strip as a Function of Metallicity

Sandage

2006

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The purpose of the paper is to predict the temperature at the fundamental blue edge (FBE) of the instability strip for RR Lyrae (RRL) variables from the pulsation equation that relates temperature to period, luminosity, and mass. Modern data for the correlations between period, luminosity, and metallicity at the FBE for field and cluster RRL are used for the temperature calculation. The predicted temperatures are changed to B-V colors using an adopted color transformation. The predicted temperatures at the FBE become hotter as [Fe/H] changes from 0 to -1.5, and thereafter cooler as the metallicity decreases to -2.5 and beyond. The temperature range over this interval of metallicity is ∆log T e = 0.04, or 640 K at 6900K. The predicted color variation is at the level of 0.03 mag in B-V. The predictions are compared with the observed RRL colors at the FBE for both the field and cluster variables, showing general agreement at the level of 0.02 mag in (B-V) o , which, however, is the uncertainty of the reddening corrections.The focus of the problem is then reversed by fitting a better envelope to the observed FBE relation between color and metallicity for metallicities smaller than -1.8 which, when inserted in the pulsation equation, gives a non-linear calibration of the absolute magnitude of the average evolved level of the HB of M V = 1.109 + 0.600 ([Fe/H]) + 0.140 ([Fe/H]) 2 , where the zero point has been set by the observed RR Lyrae stars in the LMC at V o = 19.064 for [Fe/H] = -1.5, and using an adopted LMC modulus of (m-M) o = 18.54.The position of the envelope locus at the shortest periods for the observed period-metallicity correlation differs between the field and cluster variables by ∆log P = 0.029 ± 0.007, the field variables having the shorter periods at the envelope. The field and cluster variables also differ in the near absence of cluster RR Lyraes in the -1.7 > [Fe/H] > -2.0 metallicity interval, whereas the field

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Section: The Dependence Of Rr Lyrae Mass On Metallicitymentioning

confidence: 95%

On the Predicted and Observed Color Boundaries of the RR Lyrae Instability Strip as a Function of Metallicity

Sandage

2006

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“…Lynes (1997) used the Internet with Grade 4 children to link up with 12 other classrooms around the world as they studied mathematics. According to Peterson & Facemyer (1996) the Internet creates independent learning activities and facilitates communication among learners and between learners and mentoring experts. Therefore the role o f teachers is changing from being information sources to becoming learning managers.…”

Section: Role Of Computers In Schoolsmentioning

confidence: 99%

An investigation of cooperative work with a computer program by Year 3 children

Topel¹

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I wish to acknowledge, with gratitude, the assistance o f Maijorie Carss in the design, implementation and reporting o f this work. Her interest, support and motivation have been valued. I also wish to acknowledge the assistance o f Carolyn Baker in her support o f the completion of this work. H er interest has been extremely appreciated. Grateful thanks are also extended to the children who participated in the study. Their help is recognized and appreciated.

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Finding the Southern Part of Cyberspace: Using the Internet to Teach the South

Alderman

Fournier

1998

Journal of Geography

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The Impact of the Internet on Learners and Schools

Cited by 7 publications

References 0 publications

On the Predicted and Observed Color Boundaries of the RR Lyrae Instability Strip as a Function of Metallicity

On the Predicted and Observed Color Boundaries of the RR Lyrae Instability Strip as a Function of Metallicity

An investigation of cooperative work with a computer program by Year 3 children

Finding the Southern Part of Cyberspace: Using the Internet to Teach the South

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