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Titolo:
LOW-MASS STARS IN THE CENTRAL REGION OF THE HYADES CLUSTER
Autore:
LEGGETT SK; HARRIS HC; DAHN CC;
Indirizzi:
USN OBSERV,POB 1149 FLAGSTAFF AZ 86002 UNIV SPACE RES ASSOC HILO HI 96720 JOINT ASTRON CTR HILO HI 96720
Titolo Testata:
The Astronomical journal
fascicolo: 3, volume: 108, anno: 1994,
pagine: 944 - 963
SICI:
0004-6256(1994)108:3<944:LSITCR>2.0.ZU;2-F
Fonte:
ISI
Lingua:
ENG
Soggetto:
NEARBY M-DWARFS; BROWN DWARFS; LUMINOSITY FUNCTION; MAIN-SEQUENCE; CHROMOSPHERIC ACTIVITY; THEORETICAL-MODELS; RADIAL-VELOCITY; PROPER MOTIONS; DISTANCE; EVOLUTION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
66
Recensione:
Indirizzi per estratti:
Citazione:
S.K. Leggett et al., "LOW-MASS STARS IN THE CENTRAL REGION OF THE HYADES CLUSTER", The Astronomical journal, 108(3), 1994, pp. 944-963

Abstract

New V and I photometry of Hyades candidates is presented and used to improve the determination of the low-mass stellar population of the central 5 degrees X5 degrees region of the cluster. We use color-magnitude diagrams appropriate for the metallicity of the cluster to identifylikely members from proper motion and photometric surveys, and to identify possible unresolved Hyades binaries. The resulting candidate sample consists of 49 objects (38 apparently single stars plus 11 probable unresolved binaries) with 0.4 greater than or equal to, mass/M.greater than or equal to 0.1 which have both proper motions and colors consistent with cluster membership, plus 13 faint (19 less than or equal to V less than or equal to 22.5) objects around the hydrogen-burning limit which lack proper motions but which have colors consistent with membership. We present new H alpha observations which further support the contention that Hyades members less massive than about 0.3M. all have H alpha in emission, in agreement with the expectation of longer spindown time scales for lower mass stars. A cluster luminosity function based on 63 individual stars is presented. Comparison with theoreticalmodels indicates that the present cluster mass function is flat at these low masses, implying that brown dwarfs make up no more than similar to 10% of the total mass of the cluster.

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Documento generato il 25/05/18 alle ore 08:59:58