HR 4912 - A variable of the old-disk population

Details HR 4912 - A variable of the old-disk population HR 4912 - A variable of the old-disk population

Jul 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983pasp...95..413l&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 95, July 1983, p. 413-421.

Astronomy and Astrophysics

Astronomy

57

Late Stars, Stellar Evolution, Stellar Spectrophotometry, Supergiant Stars, Variable Stars, Abundance, Asymptotic Giant Branch Stars, H Alpha Line, Hertzsprung-Russell Diagram, Spectral Line Width, Spectrum Analysis, Stellar Magnitude

Scientific paper

Spectrographic observations of the F3 Ia low-amplitude variable (period 44-68 days) star HR 4912 are reported. Spectra obtained with an echelle spectrograph on the 4-m telescope at Cerro Tololo in April, 1981, at 5200-6900 A and nominal resolution 0.1 A were digitized using the KPNO microdensitometer, reconstructed, and smoothed; digital spectra obtained with a Reticon-equipped coudespectrometer on the 2.7-m reflector at McDonald Observatory in June, 1982, in 100-A exposures at 5380, 6300, 6385, 6470, 6560, and 8710 A were FFT smoothed; the continuum was set by hand from both data sets, and usable equivalent widths were obtained for about 300 lines. The analytical model and its basic assumptions are discussed. Tables of calculated metallic and CNO abundances are presented. From the relatively low Fe/H ratio (-1.2) it is inferred that HR 4912 is a representative of the old-disk population and not a classical cepheid. The absolute magnitude estimation (about -4) places the star to the left of the asymptotic giant branch on the HR-diagram evolutionary track for a 0.6-solar-mass-function CO-core model, consistent with an SRd-variable classification.

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