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Titolo:
Mass ratios of the components in T Tauri binary systems and implications for multiple star formation
Autore:
Woitas, J; Leinert, C; Kohler, R;
Indirizzi:
Thuringer Landessternwarte Tautenburg, D-07778 Tautenberg, Germany Thuringer Landessternwarte Tautenburg Tautenberg Germany D-07778 Germany Max Planck Inst Astron, D-69117 Heidelberg, Germany Max Planck Inst Astron Heidelberg Germany D-69117 17 Heidelberg, Germany Univ Calif San Diego, Ctr Astrophys & Space Sci, La Jolla, CA 92093 USA Univ Calif San Diego La Jolla CA USA 92093 ce Sci, La Jolla, CA 92093 USA
Titolo Testata:
ASTRONOMY & ASTROPHYSICS
fascicolo: 3, volume: 376, anno: 2001,
pagine: 982 - 996
SICI:
1432-0746(200109)376:3<982:MROTCI>2.0.ZU;2-C
Fonte:
ISI
Lingua:
ENG
Soggetto:
CENTAURUS OB ASSOCIATION; YOUNG STELLAR OBJECTS; EVOLUTIONARY MODELS; FORMING REGIONS; IMAGING SURVEY; GG TAURI; M-DWARFS; SCORPIUS; ACCRETION; FRAGMENTATION;
Keywords:
binaries : general; stars : pre-main sequence; stars : formation; stars : fundamental parameters; techniques : interferometric; infrared : stars;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
65
Recensione:
Indirizzi per estratti:
Indirizzo: Woitas, J Thuringer Landessternwarte Tautenburg, Sternwarte 5, D-07778 Tautenberg, Germany Thuringer Landessternwarte Tautenburg Sternwarte 5 Tautenberg Germany D-07778
Citazione:
J. Woitas et al., "Mass ratios of the components in T Tauri binary systems and implications for multiple star formation", ASTRON ASTR, 376(3), 2001, pp. 982-996

Abstract

Using near-infrared speckle interferometry we have obtained resolved JHK-photometry for the components of 58 young binary systems. From these measurements, combined with other data taken from literature, we derive masses andparticularly mass ratios of the components. We use the J-magnitude as an indicator for the stellar luminosity and assign the optical spectral type ofthe system to the primary. On the assumption that the components within a binary are coeval we can then also place the secondaries into the HRD and derive masses and mass ratios for both components by comparison with different sets of current theoretical pre-main sequence evolutionary tracks. The resulting distribution of mass ratios is comparatively at for M-2=M-1 greater than or equal to 0.2, but depends on assumed evolutionary tracks. The mass ratio is neither correlated with the primary's mass or the components' separation. These findings are in line with the assumption that for most multiple systems in T associations the components' masses are principally determined by fragmentation during formation and not by the following accretion processes. Only very few unusually red objects were newly found among the detected companions. This finding shows that the observed overabundance of binaries in the Taurus-Auriga association compared to nearby main sequence stars should be real and not the outcome of observational biases related to infrared observing.

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Documento generato il 30/03/20 alle ore 20:06:50