Multiplicity Survey of Alpha Persei: Studying the Effects and Evolution of Companions

Details Multiplicity Survey of Alpha Persei: Studying the Effects and Evolution of Companions Multiplicity Survey of Alpha Persei: Studying the Effects and Evolution of Companions

May 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...192.5405p&link_type=abstract

American Astronomical Society, 192nd AAS Meeting, #54.05; Bulletin of the American Astronomical Society, Vol. 30, p.897

Astronomy and Astrophysics

Astronomy

1

Scientific paper

In order to investigate the large discrepancy between the companion star fraction (csf) of young T Tauri stars and older field stars and to study the role of binarity in stellar rotational evolution, we have conducted a 2.2 mu m speckle imaging survey of 106 members of the young (50-70 Myr) open cluster alpha Persei. The stars in the sample all have K magnitudes brighter than K=10.0mag. Based on a preliminary analysis of this data set, 10 binaries are detected within the separation range 0\farcs20 to 1\farcs70 (33 AU - 282 AU) and the magnitude difference range Delta K <= 3mag; the limited number of binaries detected thus far prevents a significant comparison of the csf of the slow and rapid rotators in alpha Persei. The initial assesment of the observed csf is csf_{alpha Per}=0.09 +/- 0.03. This value of the cluster multiplicity is more than 2 times lower than the observed csf, measured over the same separation range, for nearby T Tauri stars (csf_{T T}=0.24 +/- 0.03), but is consistent with the results from surveys of the slightly older ( ~ 125 Myr) Pleiades cluster (csfPl=0.13 +/- 0.03) and the much older ( ~ 5 Gyr) field G-dwarfs (csffield=0.13 +/- 0.03). Contrary to the results of a recent speckle survey of the Hyades (sensitive to a closer separation range), the initial results of the alpha Persei study do not support the idea that multiple systems are disrupted over time, and instead support explanations for the high value of csf_{T T} that involve environmental factors such as density and temperature or different distributions of binary separations. Further analysis of the alpha Persei data will cover a wider separation range, allowing an investigation of the distribution of binary separations.

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