Hubble image -white dwarfs in a globular cluster

Cas A

And how do we know?

Tycho’s SNR

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GK PerCen 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 3454 - CHANDRA HETG SPECTROSCOPY OF GK PER IN OUTBURST

X-Ray Imaging and X-Ray Data:

The Data Consists of:

EnergyTime of Arrival – discrete – usually 3.24s in duration

Position

DateBrightness(Magnitude) Date

Brightness(Magnitude)

April 21 9.2 June 20 8.7

April 27 9.3 June 26 8.3

May 3 9.7 July 2 8.6

May 9 9.9 July 8 9.1

May 15 9.6 July 14 9.1

May 21 9.8 July 20 9.2

May 27 9.9 July 26 9.5

June 2 9.7 Aug 1 9.9

June 8 9.1 Aug 7 9.7

June 14 8.8 Aug 13 9.7

eclipsing binaries

and supernovae.

We can compare light curves of unknown objects to standard light curves made of objects such as:

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Regular or irregular variation?

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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?

Msun = 2.0 X 1030 kg