Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apj...202..335n&link_type=abstract
Astrophysical Journal, vol. 202, Dec. 1, 1975, pt. 1, p. 335-345.
Astronomy and Astrophysics
Astrophysics
56
Cepheid Variables, Galactic Structure, Star Distribution, Stellar Evolution, Chemical Composition, Galactic Clusters, Magellanic Clouds, Mass Distribution, Stellar Luminosity
Scientific paper
It is proposed that the dwarf spheroidal galaxies of the Local Group are characterized by a range in stellar populations and extreme metal deficiency. Differences between the variable stars in the dwarf spheroidal systems and the globular clusters of the Galaxy are reviewed, and it is shown that Cepheids in the former systems obey a period-luminosity law quite distinct from that of the Cepheids in the latter systems. It is also shown that neither discrete age differences between the dwarf spheroidals and the Galaxy nor differences in helium abundance can explain this observation. Therefore, it is argued that the dwarf spheroidal systems formed independently from the Galaxy a few billion years after its collapse, that the majority of stars in these systems formed during the initial phase, and that their Cepheids belong to a relatively young and metal-deficient population. It is suggested that Cepheids in the Small Magellanic Cloud that are similar to those in the dwarf spheroidal systems may also be relatively young metal-deficient stars.
Norris Jackson
Zinn Robert
No associations
LandOfFree
The Cepheid variables and the stellar populations of the dwarf spheroidal galaxies 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 Cepheid variables and the stellar populations of the dwarf spheroidal galaxies, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Cepheid variables and the stellar populations of the dwarf spheroidal galaxies will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1576712