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Autor:

Robin Leadbeater [ 28. September 2012, 19:26:56 PM ]

Betreff des Beitrags:

WR137 test results from Three Hills Observatory

Attached are the first measurements at THO of WR137 (CIII, CIV lines) with the same setup as used for WR134, 135 (1.3A resolution)

Wavelength calibration was done using weak Ne lines in the LHIRES internal calibration lamp (see attached screen shot0

There are significant changes in the top of the CIII line in 2 hours and there may also be changes on the blue edge of the CIV line though these are at the noise level.

Cheers
Robin

Dateianhänge:

wr137_c5696_necal.png [ 42.16 KiB | 4071 mal betrachtet ]

wr137_c5696_20120926.png [ 18.62 KiB | 4071 mal betrachtet ]

Autor:

Robin Leadbeater [ 28. September 2012, 19:55:51 PM ]

Betreff des Beitrags:

Re: WR137 test results from Three Hills Observatory

Zitat:

There are significant changes in the top of the CIII line in 2 hours and there may also be changes on the blue edge of the CIV line though these are at the noise level.

Attached is a plot of the difference between the two spectra

Robin

Dateianhänge:

wr137_c5696_20120926_difference.png [ 20.96 KiB | 4066 mal betrachtet ]

Autor:

Robin Leadbeater [ 29. September 2012, 19:27:21 PM ]

Betreff des Beitrags:

A third observation from last night overlaid on the previous results showing changes on the top of the WR137 CIII 5696 line in 2 hrs and 2 days

Cheers
Robin

Dateianhänge:

wr137_c5696_20120926_28.png [ 19.24 KiB | 4042 mal betrachtet ]

Autor:	Thomas Eversberg [ 29. September 2012, 19:40:47 PM ]
Betreff des Beitrags:
Excellent, Robin! Now we all can see why we need S/N of about 200. Cheers, Thomas

Autor:	Tony Moffat [ 29. September 2012, 19:46:18 PM ]
Betreff des Beitrags:	WR137 test results from Three Hills Observatory
Nice result, Robin. As expected, the green spectrum after 2 days is entirely different wrt the clumping on top of the line, while after only 2 hours, the differences are much smaller ? the clumps haven?t had enough time to change a lot. Ideally you want a minimum of 3 spectra of each star each clear night to quantify how the clumps are behaving. During the short summer nights this will not be possible with your set-up, so you?ll probably have to do just 2 stars each 3 times, rotating the choice of 2 stars from night to night. you might even have to do just one star. By having enough different observers at different sites, we should be able to fill in gaps created this way and from weather. It?s probably too complicated to try and coordinate this to minimize the gaps. Best, Tony From: Robin Leadbeater (fg-spek-convento@vds-astro.de) Sent: Saturday, September 29, 2012 1:27 PM To: fg-spek-convento@vds-astro.de (fg-spek-convento@vds-astro.de) Subject: [fg-spek] Re: WR137 test results from Three Hills Observatory A third observation from last night overlaid on the previous results showing changes on the top of the WR137 CIII 5696 line in 2 hrs and 2 days Cheers Robin

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