A spatial distribution of the young populations of various age groups in the Sagittarius-Carina arm

Title:

A spatial distribution of the young populations of various age groups in the Sagittarius-Carina arm

Creator:

Avedisová, V. S.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:7e64ab30-4474-4f99-a244-9264a3175ab9
uuid:7e64ab30-4474-4f99-a244-9264a3175ab9

Subject:

space research, spiral pattern parameters, and Sagittarius-Carina arm

Type:

model:article and TEXT

Format:

bez média and svazek

Description:

The spatial distribution of the young objects of varioue age groups - HII regions and open clusters - in the Saglttarius-Carina arm (SC arm) at 1 « 280°- 25° ie Inyestlgated. Both transverse and longitudinal age gradients have been found in the arm, Two giant star formation complexes with the size of about 1 kpc at 1 = 285°-300° at 1 = 340°-20° are existed, Each of them contains several giant HII regions, a number of glant moleoular clouds (GMCa) and some extremely young clusters, Between these complexes we have found an elder one of the same aime.This complex contains 24 (3-6)»10^7 years old clusters and a small number of faint HII regions. Assuming that it is a remnant of a giant star formation complex the upper limit of lifetimes for such complexes and GMCs is (3-6)•10^7 years, The estimations of spiral pattem parameters are made.The value of the pitch-angle is 21°+3°. The value of spiral pattem velocity, -26.8+2.2 km/s«kpc, leads us to conclusion that the Sun is near the oorrotation radius of the Galaxy. The star formation efficiency in these complexes is discussed.

Language:

Czech

Rights:

http://creativecommons.org/publicdomain/mark/1.0/
policy:public

Coverage:

171-175

Source:

Publications of the Astronomical Institute of the Academy of Sciences of the Czech Republic | 1987 Volume:63-70 | Number:69

Harvested from:

CDK

Metadata only:

false