Hubble image -white dwarfs in a globular cluster.

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Presentation transcript:

Hubble image -white dwarfs in a globular cluster

Cas A And how do we know?

Tycho’s SNR

GK Per Cen X3 1.Go to Analysis>Virtual Observatory and check any of the servers. From the new window that appears, click Obs ID 1943 – THE WIND AND ACCRETION DISK IN CEN X-3/V779 CEN. 2.Choose Frame>Tile Frames and Frame>New Frame 3.Click the back button on the server window and click Obs ID CHANDRA HETG SPECTROSCOPY OF GK PER IN OUTBURST

Craf t Sch em atic X-Ray Imaging and X-Ray Data: The Data Consists of: Energy Time of Arrival – discrete – usually 3.24s in duration Position

Date Brightness (Magnitude) Date Brightness (Magnitude) April 219.2June April 279.3June May 39.7July 28.6 May 99.9July 89.1 May 159.6July May 219.8July May 279.9July June 29.7Aug 19.9 June 89.1Aug 79.7 June 148.8Aug 139.7

eclipsing binaries and supernovae. We can compare light curves of unknown objects to standard light curves made of objects such as:

Regular or irregular variation?

Zoom in on an area on the graph by either left clicking and dragging a box around a region of the graph until you can determine if there appears to be a periodic x-ray pulse.

The power spectrum plots the likelihood that a frequency is present in the data (represented by "power" on the vertical axis) as a function of frequency (on the horizontal axis). Go to Analysis>Chandra Ed Analysis Tools>FTOOLS Power Spectrum and click OK.

Accreting white dwarf Accretion powered pulsar

Zoom of Power Spectrum of Cen X-3 Zoom of Power Spectrum of GK Per period = frequency 1

Comparison of a White Dwarf Star and the Earth. Comparison of a Neutron Star and the Island of Manhattan. How fast can a star spin without blowing apart? M sun = 2.0 X kg

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