August 1, 2008 – 5:04 pm by
Jeffrey Hall
After a 7-month hiatus during which we rebuilt our entire spectrograph system downstream of the cameras, we are again operational and observing the long-term behavior of the Sun and its closest stellar cousins.
In January 2008, the old camera electronics on the Solar-Stellar Spectrograph died after 17 years of hard service. Fortunately, we had budgeted in our new grant to replace the cameras and control computer anyway, and funding for that grant, provided by the National Science Foundation, also began in January. Since then, we have planned our new system, ordered cameras, had them delivered, rebuilt the whole system downstream of the focusing lenses, troubleshot things, and integrated the new data format into our software…and this week, we began observations of the Sun and stars once again. Not a moment too soon, either, as solar cycle 24 slowly lurches into gear. This success came about primarily thanks to a lot of hard work by Lowell Director of Technical Services Ralph Nye, who put in many hours getting us reassembled, with additional help on the optical setup by Instrument Scientist Ted Dunham. Kudos and many thanks to both of them!
In one of the upgrade’s most dramatic moments, Ralph got this picture of Wes Lockwood and me getting ready to fire up the system and take the first new spectrum this past Wednesday. Everything worked perfectly, and we are now getting ready for a 17-night observing run in August to catch up on all our favorite stars.
At left is a picture only an astronomer could love: a data frame with our spiffy new spectrum of the Sun, taken earlier today. By analyzing the amount of light in the dark spectral lines you can see throughout the image (they’re the little back lines cutting through the bright white swaths of the spectrum), we can quantify the activity level of the Sun and stars (among many other things), and compare the behavior of Sun-like stars to that of the Sun itself. The stars, in effect, give us a window into the Sun’s past, including interesting periods like the Maunder Minimum.
You can read all about the SSS program at our Web site. We’re also going to move our research posts to a separate blog over at that site, retaining the main Lowell blog for general Observatory news. Stay tuned for the new blog next week sometime.
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