Spectroscopy
                                                                                             (Click on images to enlarge)

At age nine I was attracted to astronomy, and collected butterflies and moths. I still have an interest in Lepidoptera, i.e., butterflies and moths, and run a Lepidoptera discussion groups called DesertLeps. One might think that astronomy and insects are incompatible but in my discussion group I have a couple members that worked (are retired) in astronomy at the professional level, but also pursue an interest in Lepidoptera.

I have always been fascinated by the idea of getting spectra of stars. Prior to the advent of the ccd camera, stellar spectroscopy was pretty much in the domain of the professionals. The ccd camera changed everything and in December 2005 a startup French company, Shelyak produced the first very affordable spectrograph for the amateur, the LHIRES III. With a resolution approaching R=18,000, it is now possible for amateurs to make scientific contributions.

In December, 2005 I purchased the spectrograph as a kit that I had to assemble myself. The kit was very inexpensively priced, $1,200, but now  only the fully assembled instrument is available (see Shelyak).  In August I took possession of a 16" Meade LX200R telescope which saw first light in February 2007. Then in May, 2007 I purchased an ST8-XME SBIG camera. Now I was equipped to do some serious spectroscopy. Originally, I had used the Meade DSI Pro camera, but I had problems with getting guiding to work with Autostar. Later, after I participated in the Epsilon Aurigae Campaign, I replaced it with the SBIG ST-i planetary camera. It works very well with CCDOPS. CCDOPS is a very old software program, dating back to at least 2005 but I can guide on the target star very well with it. If it works, why replace it with something newer? SBIG was bought out by Diffraction Limited. CCDOPS can be downloaded at its Legacy site. 

You can see what the LHIRES III looks like and get more information about it through the LHIRES III link above. What it looks like on my 16" Meade telescope can be seen in the link below that was a presentation given at a AAVSO (American Association of Variable Star Observers) titled "The Fun of Processing a Stellar Spectrum – the HARD WAY."

An example of what can be done with the LHIRES III spectrograph is the following spectrum I took on March 5, 2015.
It was part of my participated in the Epsilon Aurigae campaign in 2010 and 2011. This is a spectrum in the two sodium D lines region. Two things show what makes spectroscopy so interesting. You never know what you will get. The "Split Line" in the graph is a split line that evolved in its appearance over time. Also, the jagged points of the two sodium D absorption lines show a splitting that also evolved over time. This is discussed more fully in my paper called "Spectroscopic Results From Blue Hills Observatory of the 2009–2011 Eclipse of e Aurigae."


  

Some of the information I have had published that might be of interest is the following:
1. The Fun of Processing a Stellar Spectrum – the HARD WAY
2. Spectroscopic Results From Blue Hills Observatory of the 2009–2011 Eclipse of e Aurigae
3. Computing a Continuum and Equivalent Width for a Stellar Spectrum
4. High Resolution Spectroscopy for the Amateur: Experiences with the LHIRES III Spectrograph

For anyone interested in spectroscopy, or any other aspect of astronomy, a good organization to join is the Society for Astronomical Sciences, or SAS., Initially, it was IAPPP, the International Amateur Professional Photoelectric Photometry society, but morphed into SAS. It holds annual symposiums that used to be held in the city of Big Bear Lake in the San Bernardino Mountains, California. It was always held three days before RTMC (the Riverside Telescope Maker's Conference). RTMC was held about 10 miles east of Big Bear Lake. The two conferences taking place so close to each other made for a fantastic astronomy week: first attending SAS and then driving the 10 miles to RTMC which was always very interesting and a place to meet like minded astronomers. However, after having had conferences for about 44 years, RTMC closed in 2019. As a result, SAS now holds their symposiums in Ontario, California.

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