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Titolo:
Kinematics and age of stellar populations in the solar neighbourhood from Hipparcos data
Autore:
Caloi, V; Cardini, D; DAntona, F; Badiali, M; Emanuele, A; Mazzitelli, I;
Indirizzi:
CNR, Ist Astrofis Spaziale, I-00133 Rome, Italy CNR Rome Italy I-00133CNR, Ist Astrofis Spaziale, I-00133 Rome, Italy Osservatorio Astron Roma, I-00040 Monte Porzio Catone, Italy Osservatorio Astron Roma Monte Porzio Catone Italy I-00040 Catone, Italy
Titolo Testata:
ASTRONOMY AND ASTROPHYSICS
fascicolo: 3, volume: 351, anno: 1999,
pagine: 925 - 936
SICI:
0004-6361(199911)351:3<925:KAAOSP>2.0.ZU;2-6
Fonte:
ISI
Lingua:
ENG
Soggetto:
GROUND-BASED MEASUREMENTS; PROPER-MOTION STARS; RADIAL-VELOCITIES; GALACTIC STRUCTURE; EARLY EVOLUTION; HR DIAGRAM; PARALLAXES; ABUNDANCE; CATALOG; SAMPLE;
Keywords:
Galaxy : solar neighbourhood; Galaxy : kinematics and dynamics; Galaxy : stellar content;
Tipo documento:
Letter
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
45
Recensione:
Indirizzi per estratti:
Indirizzo: Caloi, V CNR, Ist Astrofis Spaziale, Via Fosso Cavaliere, I-00133 Rome, Italy CNR Via Fosso Cavaliere Rome Italy I-00133 , I-00133 Rome, Italy
Citazione:
V. Caloi et al., "Kinematics and age of stellar populations in the solar neighbourhood from Hipparcos data", ASTRON ASTR, 351(3), 1999, pp. 925-936

Abstract

The large sample of main sequence stars with Hipparcos parallaxes and estimates of the radial velocity has been used to study the relations among kinematics, age and heavy element content for the solar neighbourhood. The samples with V > -30 km s(-1), although including stars as old as 10(10) yr, have a very young component (age greater than or similar to 10(7) yr), and have a metallicity close to the solar one. Most of the stars with space velocity component V < -40 km s(-1) have a minimum age of about 2 10(9) yr. Stars with V less than or similar to -80 km s(-1) share a common age greater than or similar to 10(10) yr. The distribution in [Fe/H] of these latter objects suggests a decrease in metal content with increasing \V\ till [Fe/H] <-2. For V < -180 km s(-1) only the metal poor component ([Fe/H] < -0.7) isfound. The common age for large space velocity suggests that no substantial age spread exists in the inner halo, at least in the local sample.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/11/20 alle ore 15:05:42