The surface gravity of Arcturus from MgH lines, strong metal lines and the ionization equilibrium of iron

Details The surface gravity of Arcturus from MgH lines, strong metal lines and the ionization equilibrium of iron The surface gravity of Arcturus from MgH lines, strong metal lines and the ionization equilibrium of iron

Feb 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985mnras.212..497b&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 212, Feb. 1, 1985, p. 497-515. Research supported by th

Astronomy and Astrophysics

Astronomy

47

Giant Stars, Iron, Line Spectra, Metallicity, Stellar Gravitation, Equilibrium, Hydrides, Ionization, Magnesium Compounds, Pressure Broadening, Surface Properties

Scientific paper

The surface gravity of Arcturus is estimated from the strengths of MgH features (the magnesium abundance being derived from Mg I lines), from strong metal lines, and from the Fe I - Fe II ionization equilibrium. The MgH lines are log g = 1.8 (cgs units), for the effective temperature of 4375 K found by Frisk et al. (1982). This value of log g is consistent with the gravity derived from a sample of strong pressure-broadened lines of Fe I, Ca I and Na I which give log g = 1.6, and what is obtained from the ionization equilibrium of Fe, log g = 1.5. Reasons for the differences are discussed. The mass of Arcturus is found to be 0.95 solar mass when the gravity determination from MgH is used. The effective temperature is uncertain by about 50 K; a reduction of the temperature by this amount reduces the logarithmic gravity found from MgH to 1.6 and the mass to 0.7 solar mass. It is concluded that the MgH features offer promising possibilities for determining gravities of late-type stars, when good estimates of effective temperatures are available.

Affiliated with

Also associated with

No associations

Rating

The surface gravity of Arcturus from MgH lines, strong metal lines and the ionization equilibrium of iron 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 surface gravity of Arcturus from MgH lines, strong metal lines and the ionization equilibrium of iron, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The surface gravity of Arcturus from MgH lines, strong metal lines and the ionization equilibrium of iron will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1593531