Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1973
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973a%26a....25..285w&link_type=abstract
Astronomy and Astrophysics 25, 285-297
Astronomy and Astrophysics
Astrophysics
18
Scientific paper
We determine and discuss the places of formation of 19 nearby classical cepheids. The ages of the cepheids are derived from the theoretical period-age relation which we check by cluster cepheids. The resulting ages of cepheids range from 10^7 up to 10^8 years, with a maximum frequency near 5 10^7 years. The galactic orbits of the cepheids are numerically integrated backwards in time using the present space velocities and positions derived and discussed elsewhere. The spiral field of the density wave proposed by Lin et al. is included in the galactic gravitational field used. The derived birthplaces of most nearby cepheids are in agreement with the predictions of Lin's theory. Most of the nearby cepheids probably originated in the Sagittarius arm and in the Perseus arm. Only the youngest nearby cepheids are not formed within these main spiral arms but are born probably in the local arm. While Lin's theory of density waves describes successfully the places of formation of most nearby cepheids, other interpretations of the distribution of these birthplaces cannot be ruled out.
No associations
LandOfFree
Places of Formation of Nearby Classical Cepheids 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 Places of Formation of Nearby Classical Cepheids, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Places of Formation of Nearby Classical Cepheids will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1663722