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2. Membership, metallicity and lithium abundances for solar-type stars in NGC 6633

Author

Jeffries, R. D., Totten, E. J., Harmer, S., and Deliyannis, C. P.

Subjects
Astrophysics
Abstract

We present spectroscopic observations of candidate F, G and K type stars in NGC 6633, an open cluster with a similar age to the Hyades. We identify 10 new cluster members including one short period binary system. Combining this survey with that of Jeffries (1997), we identify a total of 30 solar-type members. We have used the F and early G stars to spectroscopically estimate [Fe/H]=-0.096+/-0.081 for NGC 6633 and with more precision that NGC 6633 has (0.074+/-0.041) dex less iron than the Pleiades and (0.206+/-0.040) dex less iron than the Hyades. Lithium abundances have been estimated for the NGC 6633 members and compared with consistently determined Li abundances in other clusters. Several mid F stars in NGC 6633 show strong Li depletion at approximately the same effective temperature that this phenomenon is seen in the Hyades. At cooler temperatures the Li abundance patterns in several open clusters with similar ages (NGC 6633, Hyades, Praesepe and Coma Berenices) are remarkably similar, despite their differing [Fe/H]. There is however evidence that the late G and K stars of NGC 6633 have depleted less Li than their Hyades counterparts. This qualitatively agrees with models for pre-main sequence Li depletion that feature only convective mixing, but these models cannot simultaneously explain why these stars have in turn depleted Li by more than 1 dex compared with their ZAMS counterparts in the Pleiades. Two explanations are put forward. The first is that elemental abundance ratios, particularly [O/Fe], may have non-solar values in NGC 6633 and would have to be higher than in either the Hyades or Pleiades. The second is that additional non-convective mixing, driven by angular momentum loss, causes additional photospheric Li depletion during the first few hundred Myr of main sequence evolution., Comment: Accepted for MNRAS - some figures are compressed, a better version can be found at http://www.astro.keele.ac.uk/~rdj/

Published
2002
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3. The discovery of a low mass, pre-main-sequence stellar association around gamma Velorum

Author

Pozzo, M., Jeffries, R. D., Naylor, T., Totten, E. J., Harmer, S., and Kenyon, M.

Subjects
Astrophysics
Abstract

We report the serendipitous discovery of a population of low mass, pre-main sequence stars (PMS) in the direction of the Wolf-Rayet/O-star binary system gamma^{2} Vel and the Vela OB2 association. We argue that gamma^{2} Vel and the low mass stars are truly associated, are approximately coeval and that both are at distances between 360-490 pc, disagreeing at the 2 sigma level with the recent Hipparcos parallax of gamma^{2} Vel, but consistent with older distance estimates. Our results clearly have implications for the physical parameters of the gamma^{2} Vel system, but also offer an exciting opportunity to investigate the influence of high mass stars on the mass function and circumstellar disc lifetimes of their lower mass PMS siblings., Comment: Monthly Notices of the Royal Astronomical Society, Letters - in press

Published
2000
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4. Enhanced Visualization and Interpretation of XMCD-PEEM Data Using SOM-RPM Machine Learning

Author

Wong, S, Harmer, S, Gardner, W, Schenk, A, Ballabio, D, Pigram, P, Wong, SY, Harmer, SL, Schenk, AK, Pigram, PJ, Wong, S, Harmer, S, Gardner, W, Schenk, A, Ballabio, D, Pigram, P, Wong, SY, Harmer, SL, Schenk, AK, and Pigram, PJ

Abstract

Photoemission electron microscopy (PEEM) is a powerful technique for surface characterization that provides detailed information on the chemical and structural properties of materials at the nanoscale. In this study, the potential is explored using a machine learning algorithm called self-organizing map with a relational perspective map (SOM-RPM) for visualizing and analyzing complex PEEM-generated datasets. The application of SOM-RPM is demonstrated using synchrotron-based X-ray magnetic circular dichroism (XMCD)-PEEM data acquired from a pyrrhotite sample. Traditional visualization approaches for XMCD-PEEM data may not fully capture the complexity of the sample, especially in the case of heterogeneous materials. By applying SOM-RPM to the XMCD-PEEM data, a colored topographic map is created that represents the spectral similarities and dissimilarities among the pixels. This approach allows for a more intuitive and easily interpretable representation of the data without the need of data binning or spectral smoothing. The results of the SOM-RPM analysis are compared to the conventional visualization approach, highlighting the advantages of SOM-RPM in revealing features that are not readily observable in the conventional method. This study suggests that the SOM-RPM approach can be used complimentarily for other PEEM-based measurements, such as core level and valence band X-ray photoelectron spectroscopy.

Published
2023

6. The Cambridge natural history,

Author

Harmer, S. F. (Sidney Frederic), 1862-1950, Harmer, S. F. Sir, 1862, Shipley, A. E. Sir, (Arthur Everett), 1861-1927, Wellesley College Library (archive.org), Harmer, S. F. (Sidney Frederic), 1862-1950, Harmer, S. F. Sir, 1862, and Shipley, A. E. Sir, (Arthur Everett), 1861-1927

Subjects
Zoology
Published
1895

9. Molluscs

Author

Cooke, A. H. (Alfred Hands), Harmer, S. F. (Sidney Frederic), 1862-1950, Shipley, A. E. Sir, (Arthur Everett), 1861-1927, Reed, F. R. C. (Frederick Richard Cowper), 1869-1946, MBLWHOI Library, Smithsonian Libraries, Wellesley College Library (archive.org), Cooke, A. H. (Alfred Hands), Harmer, S. F. (Sidney Frederic), 1862-1950, Shipley, A. E. Sir, (Arthur Everett), 1861-1927, and Reed, F. R. C. (Frederick Richard Cowper), 1869-1946

Subjects
Brachiopoda, Brachiopoda, Fossil, Invertebrates, Mollusca, Mollusks, Shellfish
Published
1895

10. Hemichordata

Author

Shipley, A. E. Sir, (Arthur Everett), 1861-1927, Harmer, S. F. (Sidney Frederic), 1862-1950, Herdman, W. A. Sir, (William Abbott), 1858-1924, Bridge, T. W. (Thomas William), 1848-1909, Boulenger, George-Albert, 1858-1937, Cornell University Library, MBLWHOI Library, Smithsonian Libraries, Shipley, A. E. Sir, (Arthur Everett), 1861-1927, Harmer, S. F. (Sidney Frederic), 1862-1950, Herdman, W. A. Sir, (William Abbott), 1858-1924, Bridge, T. W. (Thomas William), 1848-1909, and Boulenger, George-Albert, 1858-1937

Subjects
Anatomie, Anatomy, Chordata, Fishes, Ichthyology, morfologie, Morphology, Natural history, Pisces, Protochordata, Vertebrates, vissen
Published
1904

11. Peripatus

Author

Sedgwick, Adam, 1854-1913, Harmer, S. F. (Sidney Frederic), 1862-1950, Shipley, A. E. Sir, (Arthur Everett), 1861-1927, Sinclair, F. G. (Frederick Granville), 1858, Sharp, David, 1840-1922, University of Toronto - Earth Sciences Library (Noranda), Internet Archive, Sedgwick, Adam, 1854-1913, Harmer, S. F. (Sidney Frederic), 1862-1950, Shipley, A. E. Sir, (Arthur Everett), 1861-1927, Sinclair, F. G. (Frederick Granville), 1858, and Sharp, David, 1840-1922

Subjects
Arthropoda, Hymenoptera, Insecta, Insecten, Insects, Myriapoda, Neuroptera, Onychophora, Orthoptera, Peripatus, soorten, Species, Taxonomie, taxonomy
Published
1901

12. Flatworms and Mesozoa

Author

Gamble, F. W. (Frederick William), 1869-1926, Hartog, Marcus, Benham, William Blaxland Shoppee, 1860, Beddard, Frank E. (Frank Evers), 1858-1925, Shipley, A. E. Sir, (Arthur Everett), 1861-1927, Harmer, S. F. (Sidney Frederic), 1862-1950, Sheldon, Lilian, University of Toronto - Earth Sciences Library (Noranda), Gamble, F. W. (Frederick William), 1869-1926, Hartog, Marcus, Benham, William Blaxland Shoppee, 1860, Beddard, Frank E. (Frank Evers), 1858-1925, Shipley, A. E. Sir, (Arthur Everett), 1861-1927, Harmer, S. F. (Sidney Frederic), 1862-1950, and Sheldon, Lilian

Subjects
Bryozoa, Echiura, Invertebrates, Leeches, Nematodes, Nemertea, Phoronida, Polychaeta, Rotifera, sagitta, Worms
Published
1901

13. The Cambridge natural history.

Author

Harmer, S. F. (Sidney Frederic), 1862-1950, Shipley, A. E. Sir, (Arthur Everett), 1861-1927, University of California Libraries (archive.org), Harmer, S. F. (Sidney Frederic), 1862-1950, and Shipley, A. E. Sir, (Arthur Everett), 1861-1927

Subjects
Zoology
Published
1959

14. Subantarctic whales and whaling. Abstract.

Author

Harmer, S. F. (Sidney Frederic), 1862-1950, Harvard University, Museum of Comparative Zoology, Ernst Mayr Library, and Harmer, S. F. (Sidney Frederic), 1862-1950

Published
1919

15. The Cambridge natural history

Author

Harmer, S. F. Sir, 1862, Shipley, A. E. Sir, (Arthur Everett), 1861-1927, Robarts - University of Toronto (archive.org), Harmer, S. F. Sir, 1862, and Shipley, A. E. Sir, (Arthur Everett), 1861-1927

Subjects
Zoology
Published
1895

16. Insects. by David Sharp.

Author

Sharp, David, 1840-1922, Harmer, S. F. Sir, 1862, Shipley, A. E. Sir, (Arthur Everett), 1861-1927, NCSU Libraries (archive.org), Sharp, David, 1840-1922, Harmer, S. F. Sir, 1862, and Shipley, A. E. Sir, (Arthur Everett), 1861-1927

Subjects
Entomology, Hymenoptera, Invertebrates, Laboratory manuals
Published
1909

18. Birds / by A.H. Evans.

Author

Evans, A. H., Harmer, S. F., University of California Libraries (archive.org), Evans, A. H., and Harmer, S. F.

Subjects
Birds, Natural history, Vertebrates
Published
1909

19. Instructions for collectors

Author

Harmer, S. F. (Sidney Frederic), 1862-1950, British Museum (Natural History), Smithsonian Libraries, Harmer, S. F. (Sidney Frederic), 1862-1950, and British Museum (Natural History)

Subjects
Collection and preservation, Mammals
Published
1917

20. List of collecting stations

Author

Harmer, S. F. (Sidney Frederic), 1862-1950, Lillie, D. G., Smithsonian Libraries, Harmer, S. F. (Sidney Frederic), 1862-1950, and Lillie, D. G.

Subjects
Antarctica, Collection and preservation, Scientific Expeditions, Zoological specimens
Published
1914

22. The Cambridge natural history

Author

Harmer, S. F. (Sidney Frederic), 1862-1950, Shipley, A. E. Sir, (Arthur Everett), 1861-1927, Cornell University Library, Harmer, S. F. (Sidney Frederic), 1862-1950, and Shipley, A. E. Sir, (Arthur Everett), 1861-1927

Subjects
Zoologia Geral, Zoology

23. The Cambridge natural history

Author

Harmer, S. F. (Sidney Frederic), 1862-1950, Shipley, A. E. Sir, (Arthur Everett), 1861-1927, Cornell University Library, Harmer, S. F. (Sidney Frederic), 1862-1950, and Shipley, A. E. Sir, (Arthur Everett), 1861-1927

Subjects
Zoologia Geral, Zoology

24. The Cambridge natural history

Author

Harmer, S. F. (Sidney Frederic), 1862-1950, Shipley, A. E. Sir, (Arthur Everett), 1861-1927, Cornell University Library, Harmer, S. F. (Sidney Frederic), 1862-1950, and Shipley, A. E. Sir, (Arthur Everett), 1861-1927

Subjects
Zoologia Geral, Zoology

25. The Cambridge natural history

Author

Harmer, S. F. (Sidney Frederic), 1862-1950, Shipley, A. E. Sir, (Arthur Everett), 1861-1927, Cornell University Library, Harmer, S. F. (Sidney Frederic), 1862-1950, and Shipley, A. E. Sir, (Arthur Everett), 1861-1927

Subjects
Zoologia Geral, Zoology

26. The Cambridge natural history

Author

Harmer, S. F. (Sidney Frederic), 1862-1950, Shipley, A. E. Sir, (Arthur Everett), 1861-1927, Cornell University Library, Harmer, S. F. (Sidney Frederic), 1862-1950, and Shipley, A. E. Sir, (Arthur Everett), 1861-1927

Subjects
Zoologia Geral, Zoology

27. The Cambridge natural history

Author

Harmer, S. F. (Sidney Frederic), 1862-1950, Shipley, A. E. Sir, (Arthur Everett), 1861-1927, Cornell University Library, Harmer, S. F. (Sidney Frederic), 1862-1950, and Shipley, A. E. Sir, (Arthur Everett), 1861-1927

Subjects
Zoologia Geral, Zoology

28. The Cambridge natural history

Author

Harmer, S. F. (Sidney Frederic), 1862-1950, Shipley, A. E. Sir, (Arthur Everett), 1861-1927, Cornell University Library, Harmer, S. F. (Sidney Frederic), 1862-1950, and Shipley, A. E. Sir, (Arthur Everett), 1861-1927

Subjects
Zoologia Geral, Zoology

29. The Cambridge natural history

Author

Harmer, S. F. (Sidney Frederic), 1862-1950, Shipley, A. E. Sir, (Arthur Everett), 1861-1927, Cornell University Library, Harmer, S. F. (Sidney Frederic), 1862-1950, and Shipley, A. E. Sir, (Arthur Everett), 1861-1927

Subjects
Zoologia Geral, Zoology

30. The Cambridge natural history

Author

Harmer, S. F. (Sidney Frederic), 1862-1950, Shipley, A. E. Sir, (Arthur Everett), 1861-1927, Smithsonian Libraries and Archives, Harmer, S. F. (Sidney Frederic), 1862-1950, and Shipley, A. E. Sir, (Arthur Everett), 1861-1927

Subjects
Zoologia Geral, Zoology

31. The Cambridge natural history

Author

Harmer, S. F. (Sidney Frederic), 1862-1950, Shipley, A. E. Sir, (Arthur Everett), 1861-1927, University of Toronto - Robarts Library, Harmer, S. F. (Sidney Frederic), 1862-1950, and Shipley, A. E. Sir, (Arthur Everett), 1861-1927

Subjects
Zoologia Geral, Zoology

32. The Cambridge natural history

Author

Harmer, S. F. (Sidney Frederic), 1862-1950, Shipley, A. E. Sir, (Arthur Everett), 1861-1927, University of Toronto - Earth Sciences Library (Noranda), Harmer, S. F. (Sidney Frederic), 1862-1950, and Shipley, A. E. Sir, (Arthur Everett), 1861-1927

Subjects
Zoologia Geral, Zoology

33. The Cambridge natural history

Author

Harmer, S. F. (Sidney Frederic), 1862-1950, Shipley, A. E. Sir, (Arthur Everett), 1861-1927, University of Toronto - Earth Sciences Library (Noranda), Harmer, S. F. (Sidney Frederic), 1862-1950, and Shipley, A. E. Sir, (Arthur Everett), 1861-1927

Subjects
Zoologia Geral, Zoology

34. The Cambridge natural history

Author

Harmer, S. F. (Sidney Frederic), 1862-1950, Shipley, A. E. Sir, (Arthur Everett), 1861-1927, University of Toronto - Earth Sciences Library (Noranda), Harmer, S. F. (Sidney Frederic), 1862-1950, and Shipley, A. E. Sir, (Arthur Everett), 1861-1927

Subjects
Zoologia Geral, Zoology

35. The Cambridge natural history

Author

Harmer, S. F. (Sidney Frederic), 1862-1950, Shipley, A. E. Sir, (Arthur Everett), 1861-1927, University of Toronto - Earth Sciences Library (Noranda), Harmer, S. F. (Sidney Frederic), 1862-1950, and Shipley, A. E. Sir, (Arthur Everett), 1861-1927

Subjects
Zoologia Geral, Zoology

36. The Cambridge natural history

Author

Harmer, S. F. (Sidney Frederic), 1862-1950, Shipley, A. E. Sir, (Arthur Everett), 1861-1927, University of Toronto - Earth Sciences Library (Noranda), Harmer, S. F. (Sidney Frederic), 1862-1950, and Shipley, A. E. Sir, (Arthur Everett), 1861-1927

Subjects
Zoologia Geral, Zoology

37. The Cambridge natural history

Author

Harmer, S. F. (Sidney Frederic), 1862-1950, Shipley, A. E. Sir, (Arthur Everett), 1861-1927, University of Toronto - Earth Sciences Library (Noranda), Harmer, S. F. (Sidney Frederic), 1862-1950, and Shipley, A. E. Sir, (Arthur Everett), 1861-1927

Subjects
Zoologia Geral, Zoology

38. The Cambridge natural history

Author

Harmer, S. F. (Sidney Frederic), 1862-1950, Shipley, A. E. Sir, (Arthur Everett), 1861-1927, Smithsonian Libraries and Archives, Harmer, S. F. (Sidney Frederic), 1862-1950, and Shipley, A. E. Sir, (Arthur Everett), 1861-1927

Subjects
Zoologia Geral, Zoology

40. The Cambridge natural history

Author

Harmer, S. F. (Sidney Frederic), 1862-1950, Shipley, A. E. Sir, (Arthur Everett), 1861-1927, Smithsonian Libraries and Archives, Harmer, S. F. (Sidney Frederic), 1862-1950, and Shipley, A. E. Sir, (Arthur Everett), 1861-1927

Subjects
Zoologia Geral, Zoology

41. The Cambridge natural history

Author

Harmer, S. F. (Sidney Frederic), 1862-1950, Shipley, A. E. Sir, (Arthur Everett), 1861-1927, MBLWHOI Library, Harmer, S. F. (Sidney Frederic), 1862-1950, and Shipley, A. E. Sir, (Arthur Everett), 1861-1927

Subjects
Zoologia Geral, Zoology

42. The Cambridge natural history

Author

Harmer, S. F. (Sidney Frederic), 1862-1950, Shipley, A. E. Sir, (Arthur Everett), 1861-1927, MBLWHOI Library, Harmer, S. F. (Sidney Frederic), 1862-1950, and Shipley, A. E. Sir, (Arthur Everett), 1861-1927

Subjects
Zoologia Geral, Zoology

43. The Cambridge natural history

Author

Harmer, S. F. (Sidney Frederic), 1862-1950, Shipley, A. E. Sir, (Arthur Everett), 1861-1927, Harvard University, Museum of Comparative Zoology, Ernst Mayr Library, Harmer, S. F. (Sidney Frederic), 1862-1950, and Shipley, A. E. Sir, (Arthur Everett), 1861-1927

Subjects
Zoologia Geral, Zoology

44. The Cambridge natural history

Author

Harmer, S. F. (Sidney Frederic), 1862-1950, Shipley, A. E. Sir, (Arthur Everett), 1861-1927, Smithsonian Libraries, Harmer, S. F. (Sidney Frederic), 1862-1950, and Shipley, A. E. Sir, (Arthur Everett), 1861-1927

Subjects
Zoologia Geral, Zoology

45. The Cambridge natural history

Author

Harmer, S. F. (Sidney Frederic), 1862-1950, Shipley, A. E. Sir, (Arthur Everett), 1861-1927, University of Toronto - Earth Sciences Library (Noranda), Harmer, S. F. (Sidney Frederic), 1862-1950, and Shipley, A. E. Sir, (Arthur Everett), 1861-1927

Subjects
Zoologia Geral, Zoology

46. The Cambridge natural history

Author

Harmer, S. F. (Sidney Frederic), 1862-1950, Shipley, A. E. Sir, (Arthur Everett), 1861-1927, Smithsonian Libraries and Archives, Harmer, S. F. (Sidney Frederic), 1862-1950, and Shipley, A. E. Sir, (Arthur Everett), 1861-1927

Subjects
Zoologia Geral, Zoology

47. The Cambridge natural history

Author

Harmer, S. F. (Sidney Frederic), 1862-1950, Shipley, A. E. Sir, (Arthur Everett), 1861-1927, Smithsonian Libraries, Harmer, S. F. (Sidney Frederic), 1862-1950, and Shipley, A. E. Sir, (Arthur Everett), 1861-1927

Subjects
Zoologia Geral, Zoology

48. Thomas William Bridge, 1848-1909

Author

Harmer, S. F. (Sidney Frederic), 1862-1950, Smithsonian Libraries, and Harmer, S. F. (Sidney Frederic), 1862-1950

Subjects
(Thomas William), b. 1848, Biography, Bridge, T. W, Great Britain, Zoologists

49. The Cambridge natural history

Author

Harmer, S. F. (Sidney Frederic), 1862-1950, Shipley, A. E. Sir, (Arthur Everett), 1861-1927, Smithsonian Libraries, Harmer, S. F. (Sidney Frederic), 1862-1950, and Shipley, A. E. Sir, (Arthur Everett), 1861-1927

Subjects
Zoologia Geral, Zoology

50. The Cambridge natural history

Author

Harmer, S. F. (Sidney Frederic), 1862-1950, Shipley, A. E. Sir, (Arthur Everett), 1861-1927, Smithsonian Libraries, Harmer, S. F. (Sidney Frederic), 1862-1950, and Shipley, A. E. Sir, (Arthur Everett), 1861-1927

Subjects
Zoologia Geral, Zoology

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