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L

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RE: Taurus
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Alpha Taurus and the Hyades captured with a 100mm f5 Helios refractor and Canon EOS350D. Motorised EQ1 Mount.

Picture 844 

Prime focus.

Clear sky. Moderate seeing. 

Processed in Paint Shop Pro.

 


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L

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Hyades
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Picture 758 
Date: 04.01.17 


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Three panel photomosaic of the Hyades and the Pleiades.

Picture 798b_mosaic3

Canon 350D, ISO 800, 6 seconds



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Hyades cluster
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F-stars in Hyades show solar-like oscillations

The Hyades cluster was observed during the K2 mission, and one of the results; the first ever detections of solar-like oscillations in main-sequence stars in an open cluster, is published in Monthly Notices of the Royal Astronomical Society of 11 December 2016. SAC's Mikkel Lund is head author.
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Hyades and Pleiades

Picture 729



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6 panel photomosaic captured with an 8" f5 reflector and Canon EOS 350D camera. ISO 1600, 10 seconds.

ImageHYADES2B 


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Title: Single stars in the Hyades open cluster. Fiducial sequence for testing stellar and atmospheric models
Author: Taisiya G. Kopytova, Wolfgang Brandner, Emanuele Tognelli, Pier Giorgio Prada Moroni, Nicola Da Rio, Siegfried Röser, Elena Schilbach

Age and mass determinations for isolated stellar objects remain model-dependent. While stellar interior and atmospheric theoretical models are rapidly evolving, we need a powerful tool to test them. Open clusters are good candidates for this role. We complement previous studies on the Hyades multiplicity by Lucky Imaging observations with the AstraLux Norte camera. This allows us to exclude possible binary and multiple systems with companions outside 2--7 AU separation and to create a "single-star sequence" for the Hyades. The sequence encompasses 250 main-sequence stars ranging from A5V to M6V. Using the "Tool for Astrophysical Data Analysis" (TA-DA), we create various theoretical isochrones applying different combinations of interior and atmospheric models. We compare the isochrones with the observed Hyades single-star sequence on J vs. J - K_s, J vs. J - H and K_s vs. H - K_s color-magnitude diagrams. As a reference we also compute absolute fluxes and magnitudes for all stars from X-ray to mid-infrared based on photometric measurements available in the literature(ROSAT X-ray, GALEX UV, APASS gri, 2MASS JHK_s, and WISE W1 to W).We find that combinations of both PISA and DARTMOUTH stellar interior models with BT-Settl 2010 atmospheric models describe the observed sequence well. The full sequence covers the mass range 0.13 to 2.3 Msun, and effective temperatures between 3060 K and 8200 K. Within the measurement uncertainties, the current generation of models agree well with the single-star sequence. The primary limitations are the uncertainties in the measurement of the distance to individual Hyades members, and uncertainties in the photometry. Additionally, a small (~0.05 mag) systematic offset can be noted on J vs. J - K and K vs. H - K diagrams - the observed sequence is shifted to redder colors from the theoretical predictions.

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Pleiades and Hyades
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Picture 432 
Date 13.08.15 


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The Hyades open star cluster.

Picture 006 
  


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Hyades
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Test image of the Hyades with a green #58 filter.

Picture 007 
  


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