Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992phdt........13h&link_type=abstract
Ph.D. Thesis Arizona Univ., Tucson.
Astronomy and Astrophysics
Astronomy
21
A Stars, Astronomical Photometry, Galactic Clusters, Infrared Photometry, Mira Variables, Near Infrared Radiation, Populations, Star Formation, Stellar Luminosity, Astronomical Observatories, Brightness, Infrared Spectrometers, Magnitude, Mercury Cadmium Tellurides, Time Measurement
Scientific paper
Near infrared photometry is presented for 659 stars within 2.5 of the Galactic Center from three epochs of 2.2 microns and one epoch of 1.6 microns observations. The data were taken with a Rockwell 64 x 64 HgCdTe IR array at the Steward Observatory 1.6m telescope and are complete to m k = 11.0. Additional photometry at 3.4 microns for a subsample of 258 stars taken with a 58 x 62 InSb array at CTIO is also included. The sample has an average (H-K)obs which is consistent with a late-type population with (H-K)0 = 0.3 and AV = 31.8 mag and luminosities several magnitudes brighter than the Baade's Window AGB. A variability analysis shows 59 stars are long period variable candidates at the 3-sigma level. These stars show correlations in (H-K)0 vs. (K-L)0 and (K-L)0 vs. delta-mk consistent with Mira variables on the AGB. The LPV luminosities are consistent with a population few x 10 8 yr old which is older than the Galactic Center central cluster stars and younger than bulge stars in Baade's Window, implying the Galactic Center has repeating episodes of star formation. Observations of the CO(v = 2 yields 0) 2.3 microns absorption feature taken at the CTIO 4m with the IR Spectrometer Array of the unresolved stellar emission at 9 positions within 30 arc sec of Sgr A* are presented. It is shown that the CO band strength is highly correlated with rSgrA* for radii less than RCO is approximately equal to 8.5 arc sec (0.28 pc).
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