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Titolo:
THE GALACTIC ORBITS OF NEARBY UV CETI STARS
Autore:
ALLEN C; HERRERA MA;
Indirizzi:
NATL AUTONOMOUS UNIV MEXICO,INST ASTRON,APARTADO POSTAL 70264 MEXICO CITY 04510 DF MEXICO
Titolo Testata:
Revista Mexicana de Astronomia y Astrofisica
fascicolo: 1, volume: 34, anno: 1998,
pagine: 37 - 46
SICI:
0185-1101(1998)34:1<37:TGOONU>2.0.ZU;2-T
Fonte:
ISI
Lingua:
ENG
Soggetto:
CLUSTERS;
Keywords:
GALAXY KINEMATICS AND DYNAMICS; GALAXY STRUCTURE; STARS FLARE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
17
Recensione:
Indirizzi per estratti:
Citazione:
C. Allen e M.A. Herrera, "THE GALACTIC ORBITS OF NEARBY UV CETI STARS", Revista Mexicana de Astronomia y Astrofisica, 34(1), 1998, pp. 37-46

Abstract

The galactic orbits of 93 UV Ceti stars of the solar neighborhood have been numerically integrated. The UV Ceti stars studied are those of the working list for which Poveda et al. (1996a) determined kinematic properties and ages. All stars are contained within 25 pc of the Sun (pi greater than or equal to 0.04 ''), and values for their distances, proper motions and radial velocities are available for them (Gliese & Jahreiss 1991). The galactic potential model of Alien & Santillan (1991) was used, and the orbits were integrated for times similar to the age of the old disk. The galactic orbital parameters are obtained. The orbits are all regular, and the values found for the orbital parameters are similar to those characteristic of the classic young thin disk. The vertical scale height found for the whole sample is 115 pc. However, the orbital parameters found for the 7 objects with extreme kinematic characteristics recognized in Poveda et al. are markedly different from those of the rest of the flare stars; in particular, their orbital eccentricities are larger than 0.3. The vertical scale height of thesample excluding the anomalous objects is just 103 pc. Consequently, we propose that the anomalous objects belong to the thick disk, which may be characterized by either e greater than or equal to 0.3 or \z(max)\ > 400 pc.

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Documento generato il 14/12/18 alle ore 00:18:24