Stellar Populations at the South Galactic Pole

Details Stellar Populations at the South Galactic Pole Stellar Populations at the South Galactic Pole

May 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aj....109.2229e&link_type=abstract

Astronomical Journal v.109, p.2229

Astronomy and Astrophysics

Astronomy

4

Galaxy: Stellar Content, Stars: Fundamental Parameters

Scientific paper

Four-color, (R, I), Hβ, and DDO photometry for some 500 stars with known proper motion and within 10° of the South Galactic Pole is analyzed for reddening, luminosity, metal abundance, and space motion. The sample contains 275, mostly evolved, UK stars and 225 near main sequence, AF stars. The stars are divided into young disk and old disk population objects on the basis of their motion vectors and this also separates them into stars younger and older than 2 × 109 yr, on the basis of models with convective overshoot at the cores. The critical mass separating the two populations is 1.7 Msun, which is also the critical mass separating the stars that develop degenerate helium cores and evolve to a giant luminosity that is an order of magnitude greater than the main sequence turnoff, and the more massive stars that do not form degenerate cores and maintain, as giants, their mean sequence luminosity. The dispersions in the W velocity, for the OD samples of AF and UK stars, with the addition of small samples of AGB stars and high latitude A stars (presumable OD, BS) at the SUP, define the relation ωW=9.5+0.025|Z|(pc). The stars discussed here do not, generally, follow the pattern of decreasing metallicity with increasing Z, found by others for unevolved UK stars. The BS population at the NGP consists of 20% of the OD, AF stars, whereas it is only 4% at the SUP and this result may be associated with the fact that the OD/YD ratio is near 1.5 for most reliable samples, whereas it is only about 0.5 for the AF stars at the NGP.

Affiliated with

Also associated with

No associations

Rating

Stellar Populations at the South Galactic Pole 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 Stellar Populations at the South Galactic Pole, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Stellar Populations at the South Galactic Pole will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1058110