Four Decades of TiO/CN Classification Photometry

Details Four Decades of TiO/CN Classification Photometry Four Decades of TiO/CN Classification Photometry

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21340004w&link_type=abstract

American Astronomical Society, AAS Meeting #213, #406.12; Bulletin of the American Astronomical Society, Vol. 41, p.188

Statistics

Applications

Scientific paper

Photometry on the writer's eight-color narrow-band system has entered its 40th year. This poster, in connection with the HAD Special Session on "Photometry: Past and Present," reviews the history of the system and its applications. Employing interference filters approximately 50 Å in width to measure the strongest bands of TiO, VO, and CN as well as continuum points in the 7000 -- 11000 Å spectral region, the system is used primarily to provide two-dimensional spectral classifications for M stars. A precision of 0.1 spectral subtype is routinely obtained for normal stars of type K4.0 or later. The first two sets of filters were manufactured in 1969, and the first observations were made with the Perkins 1.8-m telescope at Lowell Observatory. A decade later, after some of the original filters had deteriorated, new filter sets were made for several individuals and observatories including KPNO and CTIO. During the 1970s, observations were made with S-1 photomultipliers and the emphasis was on bright stars. Later, with the acquisition of the more sensitive Varian LSE photocells by both KPNO and CTIO, observations extended to red giant cluster members, K and M supergiants in the Magellanic Clouds, and faint suspected Galactic supergiants. Observations were briefly interrupted when the ASCAP photometer at CTIO was taken out of service in 2001, but were resumed in 2003 with the establishment of the SMARTS consortium. Large-format filters representing the first 6 filters of the 8-color system have been acquired to allow work by CCD imaging. At least 15 observers have contributed an estimated 16,000 sets of narrow-band data for approximately 5000 different stars to date.

Affiliated with

Also associated with

No associations

Rating

Four Decades of TiO/CN Classification Photometry does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Four Decades of TiO/CN Classification Photometry, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Four Decades of TiO/CN Classification Photometry will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1701059