SIMBAD references

1999AJ....117.1471I - Astron. J., 117, 1471-1484 (1999/March-0)

A near-infrared search for companions around very low luminosity young stellar objects in Taurus.


Abstract (from CDS):

We have carried out a near-infrared search for companions around 23 very low luminosity young stellar objects (YSOs) in the Taurus molecular cloud. After sophisticated photometry and analysis, five extremely low luminosity YSO (ELL-YSO) candidate companions were identified by both their near-infrared colors and proximity to the primary (separation less than 6"). They show infrared excess, as do ordinary YSOs. Their absolute J-band magnitudes range from 9 to 12 mag. The masses of these companions are estimated from their J-band luminosities, which use recent evolutionary tracks for very low mass objects. It is found that all are young brown dwarf candidates. The Ks-band magnitude difference between the ELL-YSO candidate companions and their primaries ranges from 2 to 6 mag, significantly larger than observed in T Tauri binaries. It is suggested that the companions are formed by the fragmentation of a disk around the primary. The binary frequency is 22+9–10% for systems with a period ranging between 107-108 days. This frequency is consistent with that of T Tauri stars, but it is significantly higher than that of low-mass main-sequence stars.

Abstract Copyright:

Journal keyword(s): Stars: Binaries: General - Stars: Formation - Stars: Low-Mass, Brown Dwarfs

Nomenclature: Table 6: ITG NN (Nos 1-50). Table 3: ITG NN-FN N=8.

CDS comments: T.6: cross-id 'Kim' not in SIMBAD.

Simbad objects: 66

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