The Calcium Infrared Triplet Lines in Stellar Spectra

Details The Calcium Infrared Triplet Lines in Stellar Spectra The Calcium Infrared Triplet Lines in Stellar Spectra

Feb 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...254..258j&link_type=abstract

Astronomy and Astrophysics, Vol.254, NO. FEB(I), P. 258, 1992

Astronomy and Astrophysics

Astrophysics

52

Stars: Atmospheres Of, Stars: Giants, Lines, Spectra

Scientific paper

Observations of the infrared triplet lines of ionized calcium are often used as diagnostics of surface gravity among the stars contributing to the integrated light of distant galaxies. We have calculated the equivalent widths of these lines for a series of models with a broad range of input parameters to test their sensitivity to surface gravity, temperature, and calcium abundance. Over a larger range of parameter space than in earlier investigations, we find the sensitivity to be more complex than previously thought. We derive theoretical relations between equivalent width and log(g) for different values of Teff and metallicity and compare our results with observations. By actual NLTE calculations, we show that departures from LTE are small. Comparison of our results with observations of stars in the Galaxy suggests that the Ca/Fe ratio is an increasing function of metallicity.

Affiliated with

Also associated with

No associations

Rating

The Calcium Infrared Triplet Lines in Stellar Spectra 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 The Calcium Infrared Triplet Lines in Stellar Spectra, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Calcium Infrared Triplet Lines in Stellar Spectra will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1044561