Forum der Vereinigung der Sternfreunde

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

Attached is a plot of the difference between the two spectra

Robin

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

Excellent, Robin! Now we all can see why we need S/N of about 200.

Cheers, Thomas

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

_________________
Tony Moffat