Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aj....114..825e&link_type=abstract
The Astronomical Journal, v. 114, p. 825.
Astronomy and Astrophysics
Astronomy
8
Stars: Abundances, Stars: Population Ii, Galaxy: Halo
Scientific paper
Based on the most likely members of the HR 1614 supercluster and Arcturus group of old disk stars and the Kapteyn's star and Ross 451 groups of halo objects, the efficacy of various indices measuring the abundance of CN, Ca, and heavy elements Fe is tested. A calibration of the hk index (Twarog & Anthony Twarog 1995, AJ, 109, 2828) leads to Ca abundances that are twice the heavy element (Fe) abundance in the range from [Fe/H]= +0.10 to -3.0 dex but for about one-half the giants, and a third of the dwarfs, with [Fe/H] <-1.5 dex, the H and K and (or) He emission lines distort the hk index, leading to underabundances of Ca. Three aggregates in the old disk population, NGC 2243, 47 Tuc, and the Arcturus group have about the same heavy element abundance, [Fe/H]= -0.65 dex, but increasing age, in the listed order. The CN abundance index, Cm, reflects a substantial star to star variation in old disk and halo aggregates as well as a reversal in its temperature dependence near a heavy element abundance, [Fe/H] - 0.9 dex, that may represent the halo-disk boundary. The old disk appears bounded by [Fe/H]> -0.9 dex and V> -120 km/s.
No associations
LandOfFree
The Abundance of CN. Calcium and Heavy Elements in High Velocity Stars. 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 Abundance of CN. Calcium and Heavy Elements in High Velocity Stars., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Abundance of CN. Calcium and Heavy Elements in High Velocity Stars. will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1877996